mti chamber #1 process control narratives...doc #10310 - 01 v5.8 – aug 4, 2011 mti chamber #1...

MTI CHAMBER #1

PROCESS CONTROL NARRATIVES

Version Date Description

1.0 Draft Sept. 21, 2006 DRAFT for discussion 2.0 March 28, 2008 Issued for 100% submission 3.0 July 25, 2008 Issued for addendum 4.0 Nov 30, 2008 Issued for submission as per comment. 5.0 June 22, 2010 Issued for submission by Summa Engineering Limited 5.1 July 26, 2010 Modifications by Summa Engineering Limited As Per Request 5.2 August 18, 2010 Further modifications by Summa Engineering Limited As Per

Request 5.3 Nov 1,2010 After first FAT 5.4 Nov. 8,2010 After second FAT 5.5 Jan. 4, 2011 After third FAT 5.6 June 24, 2011 Modified to reflect change instruction in RFQXX 5.7 July 21, 2001 Modified to reflect recent PCN review discussions on July 15. 5.8 July 26,2001 Minor Clean-up 5.9 Aug 4,2001 Minor Clean-up

1 of 307

Doc #10310 - 01 v5.8 – Aug 4, 2011 MTI Chamber #1 Process Control Narratives, Page i

TABLE OF CONTENTS

1. SCOPE OF DOCUMENT .................................................................................................................... 3

2. PROCESS DESCRIPTION ................................................................................................................. 3

2.1 PROCESS DEFINITION ................................................................................................................... 3 2.1.1 Catchments ............................................................................................................................. 3 2.1.2 Ashbridges Bay Collection System ......................................................................................... 4 2.1.3 Mid-Toronto Interceptor (MTI) .............................................................................................. 5

2.1.3.1 Diversion Chambers (27a, 27b, 27c, 23a, 23b, 23d, 23e, 20a, 20b, 20c, 20d, 7a, 7b, 7c and 7d) ...... 5 2.1.3.2 Major Interceptor Chambers (34, 29, 24, 20, 14c and 1) ................................................................... 6

2.1.4 MTI Chamber #1 (Hiawatha Road) ........................................................................................ 6 2.2 OBJECTIVES ................................................................................................................................. 7 2.3 PROCESS CONTROL STRATEGY .................................................................................................... 8 2.4 INFLUENT SOURCES ..................................................................................................................... 8 2.5 EFFLUENT DESTINATION .............................................................................................................. 8 2.6 EQUIPMENT .................................................................................................................................. 8

2.6.1 Process ................................................................................................................................... 8

3. CONTROL DESCRIPTION ............................................................................................................... 9

3.1 CONTROL HIERARCHY ................................................................................................................. 9 3.2 CONTROL AND MONITORING OBJECTIVES .................................................................................. 10 3.3 GATE CONTROL ......................................................................................................................... 10

3.3.1 General ................................................................................................................................. 10 3.3.2 Computer Manual Mode ....................................................................................................... 11 3.3.3 Computer Auto Mode ............................................................................................................ 11 3.3.4 Operation in Failure Mode ................................................................................................... 11 3.3.5 Gate Computer Auto Control Summary ................................................................................ 12 3.3.6 Level 1 Control Hierarchy .................................................................................................... 12 3.3.7 Level 2 Control Hierarchy .................................................................................................... 12 3.3.8 Interlocks .............................................................................................................................. 13

3.3.8.1 Software Interlocks ......................................................................................................................... 13 3.4 HYDRAULIC SYSTEM PUMP CONTROL ........................................................................................ 13

3.4.1 General ................................................................................................................................. 13 3.4.2 Computer Manual ................................................................................................................. 13 3.4.3 Computer Auto ...................................................................................................................... 14 3.4.4 P-Trap Seal Primer Valve .................................................................................................... 14

3.5 OTHER PROCESS MONITORING AND CONTROL ........................................................................... 15 3.5.1 Level 1 .................................................................................................................................. 15 3.5.2 Level 2 .................................................................................................................................. 15

3.5.2.1 Analog Setpoints/Alarms ................................................................................................................ 15 3.6 RPU INPUTS/OUTPUTS ............................................................................................................... 15 3.7 SECURITY ................................................................................................................................... 18

3.7.1 Local Operator Interface Security ........................................................................................ 18 3.7.2 Chamber Access Security ..................................................................................................... 18

3.8 ALARM DIALER .......................................................................................................................... 19 3.9 TRENDING .................................................................................................................................. 19

APPENDIX I: GATE ALARMS LIST ..................................................................................................... 20

APPENDIX II: PUMP ALARMS LIST ................................................................................................... 21

2 of 307

Doc #10310 - 01 v5.8 – Aug 4, 2011 MTI Chamber #1 Process Control Narratives, Page ii

APPENDIX III: ANALOG SETPOINTS/ALARMS TABLE ................................................................ 22

APPENDIX IV: DEFAULT INITIAL PARAMETERS TABLE ........................................................... 24

LIST OF TABLES

Table 1: Referenced Documents ..................................................................................................................... 3 Table 2: Major Equipment - MTI Chamber #1 .............................................................................................. 9 Table 3: Gate Control Setpoints ................................................................................................................... 11 Table 4: HPUI Control Setpoints .................................................................................................................. 14 Table 5: P-Trap Timers’ Control Setpoints .................................................................................................. 14 Table 6: RPU I/O List................................................................................................................................... 15 Table 7: Gate Alarms List ............................................................................................................................ 20 Table 8: Pump Alarms List ........................................................................................................................... 21 Table 9: Analog Alarm Setpoints ................................................................................................................. 22 Table 10: Analog Alarms ............................................................................................................................. 23 Table 11: Default Parameters Table – Initial Values .................................................................................... 24

LIST OF FIGURES

Figure 1: City of Toronto Catchments ............................................................................................................ 4 Figure 2: MTI and Its Components ................................................................................................................ 4 Figure 3: Mid Toronto Interceptor .................................................................................................................. 5 Figure 4: Diversion Chamber ......................................................................................................................... 6 Figure 5: Interceptor Chamber ....................................................................................................................... 6 Figure 6: Process Diagram ............................................................................................................................. 7 Figure 7: Control Hierarchy ......................................................................................................................... 10

3 of 307

Doc #10310 - 01 v5.8 – Aug 4, 2011 MTI Chamber #1 Process Control Narratives, Page 3

1. SCOPE OF DOCUMENT

This document defines the process narratives for the Mid-Toronto Interceptor (MTI) Chamber #1 (Hiawatha Road). The document follows City of Toronto’s standard defined in the Process Control System Implementation Manual, Version 1, September 19, 2005. This document consists of two main sections, process description and control description. Process description includes process definition, objectives and process equipment. Control description includes a description of the control system including control logic and I/O. Table 1: Referenced Documents

Document Title Docs Open #

MTI Chamber #1 P&ID – Contract Drawing No. 1269-2008-01-26 Sht. I01

Process Control System Implementation Manual, Version 1, September 19, 2005

2. PROCESS DESCRIPTION

2.1 Process Definition

2.1.1 Catchments The City of Toronto has three Catchments, each includes a Collection System and a Treatment Plant. The three Catchments are Humber, Ashbridges Bay and Highland Creek. The collection systems operate independently except for one situation, where sludge from Humber gets transferred to Ashbridges Bay. The collection systems consist of trunk sewer, monitoring points, billing locations, storage facilities, pump stations, and regulating chambers. The collection system is shown in figure 1.

4 of 307


Humber Collection System

Humber Treatment Plant

Humber Catchment

Sanitary Combined

Effluent To Lake Ontario

Ashbridges Bay Collection System

Ashbridges Bay Treatment Plant

Ashbridges Bay Catchment

Sanitary Combined


Sludge To MTI

CSO To Lake Ontario“T” Building and “M” Building Bypass

Highland Creek Collection System

Highland Creek Treatment Plant

Highland Creek Catchment

Sanitary


Pumping Station BypassCSO and Pumping

Station Bypass

WastewaterFrom Peel

WastewaterTo Peel

City of Toronto Catchments

Figure: City of Toronto Catchments Figure 1: City of Toronto Catchments

2.1.2 Ashbridges Bay Collection System The Ashbridges Bay collection system consists of three Interceptors: MTI (Mid-Toronto Interceptor), LLI (Low Level interceptor) and HLI (High Level Interceptor). Interceptor sewers are large diameter sewers that collect flow from local combined systems and transport flow to pumping stations or treatment plants. The three interceptors are depicted in figure 2.

Figure 2: MTI and Its Components

5 of 307


The components shown include the Mid-Toronto Interceptor (MTI), Low Level Interceptor (LLI), High Level Interceptor (HLI), the Ashbridges Bay Treatment Plant M Building and T Building pumping stations, and various chambers.

2.1.3 Mid-Toronto Interceptor (MTI) The Mid-Toronto Interceptor (MTI) is a 13.5 km tunnel ranging in size from 1500 mm to 3000 mm in diameter. It conveys flows intercepted from the local municipal combined collection system, flows diverted from the LLI and HLI, and sludge from Humber Treatment Plant. The MTI drains to the T Building Pumping Station where it is either pumped or flows by gravity to the Ashbridges Bay Treatment Plant. The Mid Toronto Interceptor (MTI) intercepts flow from across Toronto, predominately from the City of Toronto service area. The MTI also provides relief capacity for the High Level Interceptor (HLI) and the Low Level Interceptor (LLI). There are three chamber types in the system: interceptor, diversion, and dome. Interceptor chambers intercept the flow from local systems into the MTI. Diversion chambers divert the flow from the High Level Interceptor (HLI) and the Low Level Interceptor (LLI) to the MTI (which is at a lower level). There are six Interceptor chambers (34, 29, 24, 20, 14c, and 1) and four sets of Diversion chambers (27a b and c, 23 a b c d and e, 20 a b c and d and 7 a b c and d). Dome chambers are used to provide access to the MTI for maintenance and level monitoring. The process block diagram is shown in figure 3.

Figure 3: Mid Toronto Interceptor

2.1.3.1 Diversion Chambers (27a, 27b, 27c, 23a, 23b, 23d, 23e, 20a, 20b, 20c, 20d, 7a, 7b, 7c and 7d) Diversion Chambers divert flow from the HLI and the LLI to the MTI through the Carlaw Avenue, Victoria Street, Simcoe Street and Strachan Avenue Interceptors. A Diversion Chamber is a combination of diversion and flow control structures. These chambers have three primary functions: divert flow; drop flow down to the elevation of the MTI; and flow regulation. Wastewater flow initially enters the Diversion chamber and passes through a diversion structure where flow is diverted from the LLI or HLI to a connecting sewer, ultimately to the MTI. Following the diversion, the flow drops down to the elevation of the MTI, as the HLI and LLI are at higher elevations. The flow drop structure is located in the same chamber as the diversion structure or in a second chamber

6 of 307


downstream of the diversion structure. Prior to flow entering the inter-connecting sewer, flow passes through a sluice gate. The block diagram is shown in figure 4.

DiversionControl

Structure

DropPipe

Flow ControlStructure

InfluentHLI,LLI

EffluentTo MTI

Figure: Diversion Chamber Figure 4: Diversion Chamber

2.1.3.2 Major Interceptor Chambers (34, 29, 24, 20, 14c and 1) Interceptor chambers intercept flow from local systems into the MTI. There are twenty-four Interceptor chambers associated with the MTI. Out of these, six Major Interceptor chambers account for approximately 75% to 80% of the intercepting capacity of the MTI at present. Other smaller interceptor chambers account for the remaining 20% to 25%. Flow enters an Interceptor chamber, passes through a diversion structure consisting of one to three sluice gates, and drops through a vortex down into the MTI. The block diagram is shown in figure 5.

Figure 5: Interceptor Chamber

2.1.4 MTI Chamber #1 (Hiawatha Road) MTI Chamber #1 is a part of the overall Mid-Toronto Interceptor System. The chamber is located at the intersection of Hiawatha Road & Gerard Street East. It is an interceptor chamber, with functionality as described above. The process diagram is shown in figure 6:

7 of 307


Figure 6: Process Diagram The chamber consists of two gates and a vortex. Chamber levels on either side of the gates are monitored.

2.2 Objectives The overall objective and goals for the Collection System are:

1. Maintain system capacity 2. Minimize volume and frequency of overflows 3. Minimize volume and frequency of bypassing at the Treatment Plant 4. Prevent basement flooding occurrences 5. Maximize treatment of intercepted wastewater and combined flow 6. Minimize cost of Collection System operation

The process objective for MTI Chamber #1 is to intercept local system flows to the MTI, in a manner to support the overall Collection System objectives.

8 of 307


All key parameters will be monitored.

2.3 Process Control Strategy The MTI can be operated by gravity or with pumping to the Ashbridges Bay Treatment Plant. Under pumping operations, the MTI can reach a hydraulic capacity of 20.84 m3/s, however the outlet pumping capacity is limited to 11.13 m3/s. By gravity, the MTI acts as an inverted siphon and has a capacity of 11.13 m3/s. The MTI runs in a continuous pump-down mode to maximize the capacity of the MTI, HLI and LLI interceptors during dry and wet weather periods. During dry weather flow, the hydraulic gradeline (HGL) of the MTI under pump-down operation is lower than the HGL for the LLI and the HLI and their interconnecting points. This allows flows to be diverted from the HLI and LLI to the MTI by gravity via connecting sewers creating downstream capacity for the LLI and HLI to intercept local municipal wastewater flows. Sludge from the Humber Treatment Plant is also conveyed through the MTI ultimately to the Ashbridges Bay Treatment Plant. The sludge from the Humber TP is conveyed alternately through one of the two 250 mm forcemains that discharge into the upstream end of the MTI, at Parkside Drive (Chamber 34). The primary objectives of the MTI include:

To intercept as much sanitary and combined flows as possible. To protect the Ashbridges Bay Treatment Plant from flooding.

These objectives require a strategy that is system wide in nature and is not based on local control logic. A control strategy that is system wide will enable the operation of the MTI to be adapted to the hydrologic conditions and dynamic conditions in the collection system and at the Ashbridges Bay Treatment Plant. The present chamber upgrades will allow future implementation of such system wide strategies (Optimizer).

2.4 Influent Sources Local sewers

2.5 Effluent Destination MTI

2.6 Equipment

2.6.1 Process The chamber has two gates, designed to be locally controlled from OIT.

9 of 307


Table 2: Major Equipment - MTI Chamber #1

Description Tag Number

Gate 1 COL-MTI-G-0101 Gate 2 COL-MTI-G-0102 Level Meter, Upstream COL-MTI-LIT-0101 Level Meter, Downstream COL-MTI-LIT-0102 Hydraulic System Pump 1 COL-MTI-P-0101 Hydraulic System Pump 2 COL-MTI-P-0102 Pressure Meter, Hydraulic System COL-MTI-PIT-0100

3. CONTROL DESCRIPTION

3.1 Control Hierarchy In general the control/monitoring hierarchy will comprise two levels:

Level 1: Field Device Control (Local) Level 2: Controller (PLC/RPU) Panel

For MTI Chamber #1, the control/monitoring hierarchy will comprise two levels (see Figure 7). Each device can be operated from any of the levels provided for that device. Level 1 will be provided with a Local/Remote (L/R) switch, as explained below. The status of the L/R switch will be known to higher levels in the control hierarchy. There are no hardwired interlocks.

Level 1: Field Device Control (Local) A Local/Remote (L/R) switch will be provided at this level. To enable control from this level, the L/R switch needs to be into Local. By putting the L/R switch into Local, control of that device from higher levels within the control hierarchy will be disabled.

Level 2: Controller (RPU) Panel This level consists of the PLC/RPU for the chamber. Control/monitoring functionality will be programmed in the PLC/RPU. An Operator Interface Terminal (OIT) will be provided and this can be used for controlling the gates, maintenance and related activities.

10 of 307


Figure 7: Control Hierarchy

3.2 Control and Monitoring Objectives MTI Chamber #1 operates as an interceptor chamber, as described above. The objective is to intercept local system flows and prevent flooding at the treatment plant.

3.3 Gate Control

3.3.1 General Gate control of Chamber #1 is identical to Chamber #20. The gates (COL-MTI-G-0101 and COL-MTI-G-0102) are operated to control the flow into the MTI. The gates will also be operated for maintenance purposes. Each gate will have the following control modes:

Local Computer Manual Computer Auto

Further, the gates will be assigned Duty and Standby. The control modes as well the duties will be set from the OIT. Software interlocks (for device operation in a specific mode, and for changing modes) will be programmed in the PLC/RPU., and are discussed below.

11 of 307


3.3.2 Computer Manual Mode In Computer Manual mode, the system will be programmed to respond to an operator command (open, stop, close), provided that Computer Manual Operation Permissive (software interlock) is satisfied. Operator commands are set from the OIT Gate pop-up screen as Open/Stop/Close buttons. Level in the Chamber, Gate position, status and possible alarms are displayed on the OIT Chamber and Alarm screens. The Computer Manual Operation Permissive, “Gate available” allows for operation and entry in this mode and is always enabled.

3.3.3 Computer Auto Mode In Computer Auto mode, the device will be programmed to open/close to specified/programmed gate positions, according to the conditions in the chamber (levels). Only the gate specified as Duty will operate in this mode. Standby gate will be fully closed. If there are problems with the Duty gate, or Duty gate is switched to Manual mode, Standby gate is available to take over, provided the Standby gate is not in alarm. Gates Duty rotation will also take place at the beginning of each calendar month based on synchronized RPU-OIT system time. At the System Startup the default Duty will be assigned to Gate 1. The Upstream Level (USL) will be constantly monitored. The program will determine if USL drops below USL Low Setpoint or rises above USL High Setpoint. If USL is at or below the USL Low Setpoint then the gate will open to Gate Open to Position Setpoint. If USL is at or above USL High Setpoint then the gate will close to Gate Close to Position Setpoint. (See Gate Control Setpoints in Table 3 below). Table 3: Gate Control Setpoints Tag Name Description Comments COL-MTI-G-0101-DSP-C Gate 0101 Open to Position Setpoint 635 mm COL-MTI-G-0101-WSP-C Gate 0101 Close to Position Setpoint 304 mm COL-MTI-G-0102-DSP-C Gate 0102 Open to Position Setpoint 635 mm COL-MTI-G-0102-WSP-C Gate 0102 Close to Position Setpoint 304 mm COL-MTI-LIT-0101-LSP-C Upstream Level Low Setpoint 760 mm COL-MTI-LIT-0101-HSP-C Upstream Level High Setpoint 890 mm The gate(s) will operate in this mode provided that Auto Operation Permissive (software interlock) is satisfied. The Auto Mode Permissive is enabled based on device specific conditions.

3.3.4 Operation in Failure Mode If duty gate fails to reach the desired position setpoint, the gate control will be disabled, as further attempt to operate the gate may cause more damage. A “Gate Malfunction Alarm” is generated. The Standby gate does not automatically take over. Instead, an operator has to come to site and make a decision to alternate duty after troubleshooting.

If level transmitter lost its echo for 5 minutes continuously, duty gate to move to closed setpoint (minimum opening) until echo is restored. Auto dialer to send “High Level Alarm”. Upon restoration of echo consistently for 5 minutes, auto function is resumed.

12 of 307


3.3.5 Gate Computer Auto Control Summary Control is based on upstream (U/S) level transmitter. Duty 1 gate travels from 304 mm to 635 mm Standby gate is fully close Duty 1 gate level control as follows

▪ Upstream level ≤ 760 mm, gate at 635 mm position ▪ Upstream level ≥ 890 mm, gate at 304 mm position ▪ On rising level, gate will stay at 635 mm position until the upstream level of 890 mm is

reached ▪ On falling level, gate will stay at 304 mm position until the upstream level of 760 mm is

reached The specific functions for each level within the control hierarchy are discussed here. Each gate can generally be commanded to open to any position between fully closed and fully open. Alarm conditions will prevent the gates from further operation, however they will not trigger them from Auto into Manual mode, that is, when and if the alarm is cleared, the gates will be available for automatic operation only with operator intervention.

3.3.6 Level 1 Control Hierarchy A gate operator panel located in close proximity to the gate will provide local equipment control. The following will be provided:

Local/Remote switch Open push-button Close push-button

3.3.7 Level 2 Control Hierarchy Level 2 consists of the PLC/RPU. Operator functionality is available through the OIT. The PLC/RPU will be programmed to provide the required control and monitoring functionality for the chamber. The following functionality will be provided:

Level 1 Local/Remote status (Computer Mode) Open command Close command Stop command Computer Manual mode Gate position setpoints Control mode Command Gate Computer Auto mode level and position set-points Gate position indication (0-100%) Gate not available warning Gate general alarm Other alarms

Refer to Appendix I for a list of alarms associated with the gates.

13 of 307


3.3.8 Interlocks

3.3.8.1 Software Interlocks The following permissives will be provided: Computer Manual Operation permissive: The following conditions will set the Manual Operation Permissive to NOT OK state for the gates:

Gate general alarm (Gate failed to reach position setpoint alarm)

3.4 Hydraulic System Pump Control

3.4.1 General Hydraulic Power Unit (HPU) is a package controlled by the Remote Processing Unit (RPU) to ensure accumulators are properly charged to provide hydraulic power for gate operation. The pumps (COL-MTI-P-0101 and COL-MTI-P-0102) are operated to maintain the pressure in the accumulators. Each pump will have the following control modes:


Further, the pumps will be assigned Duty and Standby. The control modes as well the duties will be set from the OIT. Software interlocks (for device operation in a specific mode, and for changing modes) will be programmed in the PLC/RPU., and are discussed below.

3.4.2 Computer Manual In Computer Manual mode, the system will be programmed to respond to an operator command (start or stop), provided that Manual Operation Permissive (software interlock) is satisfied. This interlock consists of

Low Oil Level, High Oil Temperature, and High/Low Our of Range Pressure Transmitter values.

Operator commands are set from the OIT Pump pop-up screens as Start/Stop buttons. Pressure in the Accumulator, Pump statuses and possible alarms are displayed on OIT HPU and Alarm screens. The Computer Manual Operation Permissive allows for the entry and operation in this mode. Permissive signal consists of cleared interlock and alarms.

14 of 307


3.4.3 Computer Auto In Pump Computer Auto mode, the device will be programmed to start/stop according to the pressure of the accumulator. The control system will self-regulate accumulator pressure by turning on pumps (as required) to maintain proper stored energy for gate movement. PT1 (P1 and P2) will be determined to set MIN/MAX operational pressure conditions for the accumulators. Duty Pump will start when the operational pressure is below MIN pressure Setpoint and will stop when the operational pressure exceeds MAX pressure Setpoint. Only the pump specified as Duty will operate in this mode. If there are problems with the Duty pump, Standby pump will take over if it is in Computer Auto mode. Electric motors M1 (P-0101) and M2 (P-0102) will start alternatively when required to insure even wear. All HPU system inputs (T1, L1, DP, PT1) are utilized within the control system to insure hydraulic system remains in proper operational conditions. Same software interlock as in Computer Manual mode (see par. 3.4.2) is applicable and will prevent the pumps from starting as well as pump’s alarm (see Alarm List in Appendix II) generated by the system. Note that DP Filter Plugged input will not trigger Pumps’ General Alarm and request for Pumps’ Stop. However it will signal as a warning to inform operator of the necessity to replace the filter. T1 – Oil Temp High L1 – Oil Level Low DP – Filter Plugged PT1 – Pressure Transmitter (4-20 mA analog) Table 4: HPU Control Setpoints Tag Name Description Comments COL-MTI-PIT-0100-HSP-C Accumulator maximum pressure COL-MTI-PIT-0100-LSP-C Accumulator minimum pressure The pump(s) will operate in this mode provided that Auto Operation Permissive (software interlock) is satisfied. The Auto Operation Permissive allows for operation in this mode and consists of the manual interlock signals (see par.3.4.2) and pump related alarms Refer to Appendix II for a list of alarms associated with the pumps.

3.4.4 P-Trap Seal Primer Valve P-Trap valve is displayed on Chamber Overview screen of the OIT application and indicates its status (Open/Close) based on standard colour code. It has own control unrelated to the rest of Chamber system and time setpoints for Closed Interval and Open Duration are present on Setpoint screen and available for Operator’s adjustments. Currently it is suggested to be open twice a day for 5 minutes. Table 5: P-Trap Timers’ Control Setpoints Tag Name Description Comments (Initial Setting) COL-MTI-V-0100-TINT-C P-Trap Valve Close Interval Time 11 hour 55 minutes COL-MTI-V-0100-TDUR-C P-Trap Valve Open Duration Time 5 minutes

15 of 307


3.5 Other Process Monitoring and Control

3.5.1 Level 1 Not required

3.5.2 Level 2 Upstream Level Downstream Level Gate 1 Position Gate 2 Position Hydraulic System Pressure Alarms

3.5.2.1 Analog Setpoints/Alarms A list of set points that can be adjusted through the Operator Interface is included herein as Appendix III.

3.6 RPU Inputs/Outputs The RPU I/O list is provided in table 6. Refer to the Process and Instrumentation Diagrams for more information. Table 6: RPU I/O List

Source/Output Device Description Tag Name I/O Type

Upstream Level Transmitter (COL-MTI-LIT-0101)

Instrument Error (Loss of Echo)

COL-MTI-LIT-0101-AXA DI

Station Level 1 COL-MTI-LIT-0101-LI AI

Downstream Level Transmitter (COL-MTI-LIT-0102)


COL-MTI-LIT-0102-AXA DI

Station Level 2 COL-MTI-LIT-0102-LI AI Gate 1 (COL-MTI-G-0101)

Computer Mode COL-MTI-G-0101-YN DI Position Indication COL-MTI-G-0101-ZI AI Open Command COL-MTI-G-0101-VH DO Close Command COL-MTI-G-0101-VL DO Open Command Status COL-MTI-G-0101-ZIH DO Close Command Status COL-MTI-G-0101-ZIL DO

Gate 2 (COL-MTI-G-0102)

Computer Mode COL-MTI-G-0102-YN DI Position Indication COL-MTI-G-0102-ZI AI Open Command COL-MTI-G-0102-VH DO Close Command COL-MTI-G-0102-VL DO Open Command Status COL-MTI-G-0102-ZIH DO Close Command Status COL-MTI-G-0102-ZIL DO

16 of 307



RPU (COL-MTI-RPU-0100) RPU Power Failure Alarm

COL-MTI-RPU-0100-EAL DI

UPS (COL-MTI-UPS-0100)

Loss of Normal Power Alarm

COL-MTI-UPS-0100-EAL DI

Transfer Switch Not On Normal Power COL-MTI-TS-0101-EH DI

Door Switch (COL-MTI-ZSH-0101) Door Opened Indication

COL-MTI-ZSH-0101-ZLH DI

Smoke/Heat Detector (COL-MTI-FA-0101)

Smoke/Heat Detection Alarm COL-MTI-FA-0101-TAH DI

Hydraulic System Pump 1 (COL-MTI-P-0101)

Computer Mode COL-MTI-P-0101-YN DI Running Status COL-MTI-P-0101-MN DI Overload Status (General Alarm) COL-MTI-P-0101-XA DI Start Command COL-MTI-P-0101-MH DO Stop Command COL-MTI-P-0101-MB DO


Computer Mode COL-MTI-P-0102-YN DI Running Status COL-MTI-P-0102-MN DI Overload Status (General Alarm) COL-MTI-P-0102-XA DI Start Command COL-MTI-P-0102-MH DO Stop Command COL-MTI-P-0102-MB DO

Hydraulic Pressure Transmitter (COL-MTI-PIT-0100)

Hydraulic Sys. Pressure Indication COL-MTI-PIT-0100-PI

Hydraulic Sys. Low Oil Level Sensor (COL-MTI-LSL-0100)

Hydraulic Sys. Low Oil Level

COL-MTI-LSL-0100-LAL DI

Hydraulic Sys. High Oil Temperature Sensor (COL-MTI-TSH-0100)

Hydraulic Sys. High Oil Temperature

COL-MTI-TSH-0100-TAH DI

Hydraulic Sys. Filter Pressure Switch (COL-MTI-PSH-0100)

Hydraulic Sys. Filter Plugged

COL-MTI-PSH-0101-PAH DI

Auto Dialer (COL-MTI-ADL)

Autodialer – Level High Alarm

COL-MTI-ADL-0101-LAH DO

Autodialer – Gates Malfunction Alarm

COL-MTI-ADL-0102-FLT DO

Autodialer – Intrusion Alarm

COL-MTI-ADL-0103-INT DO

Autodialer – Loss of Power Alarm

COL-MTI-ADL-0104-EAL DO

17 of 307



Trap Seal Primer (COL-MTI-V-0100) On/Off Command COL-MTI-V-0100-MH DO

18 of 307


3.7 Security

3.7.1 Local Operator Interface Security The MTI chamber is controlled via a local operator interface (OIT). To prevent unauthorized control to the equipment, the OIT restricts access to certain screens and displays. In order to access those screens, one must login with a valid user name and password, along with the proper security clearance level. Security clearance level is divided into three main categories as listed below: Master: Users logged in as Master have a Runtime Level of 999, giving them full permission. This includes the ability to change passwords and edit the User List. Operator: Users logged in as Operator have Runtime Level 2, giving them permission to access all screens that have security level 2 or below. That includes overview screens, Device control screens as well as Setpoint screens. Guest: Users logged in as Guest have Runtime Level 0, giving them permission to access only screens that have security level 0. That includes overview, alarms and trends but not Device control screens and Setpoint screens. In essence, the Guest user is for viewing only, Operator is limited to navigate screens and control, Master is for administrator purposes.

3.7.2 Chamber Access Security The RPU is programmed such that unwanted intrusions into the street panel and chamber are alarmed and dialled out for notification. An operator can arm or disarm the building security logic in the RPU through the OIT, provided the operator has the proper OIT clearance level. When the building security is armed and the chamber hatch door or street panel is opened, the RPU will alarm after an adjustable time delay. The operator must disarm the building security through the OIT before the time delay has elapsed. Once an intrusion alarm has been activated, it will stay on until it is reset on the OIT. There is also an adjustable delay before the system is armed to allow operator sufficient time to leave the chamber. To enable (or arm) the building security system, an operator will select the security ENABLE/DISABLE selector switch on the OIT such that it is pointing at ENABLE. A security arming delay countdown will immediately appear to show how much time is remaining until the security is armed. This allows an operator sufficient time to leave the premise without accidently triggering an intrusion alarm. The green light indicator on the OIT will turn on to indicate the system has been successfully armed. At this point, should any doors be opened (the yellow light indicator will turn on), an intrusion alarm will be active and will dial out after a certain delay. If an intrusion alarm occurs, the only way to reset the alarm is to press the “Alarm Reset” button. To disable (disarm) the security system, an operator must enter the proper code to access the security screen display and then select the selector switch such that it is pointing at DISABLE (the red light

19 of 307


indicator will turn on). If the operator forgets to rearm (ENABLE) the building security after a valid entry and leaves. The building security will automatically rearm after and adjustable time delay (initially set at 1 hour) once the OIT panel door is closed.

3.8 Alarm Dialer An autodialer is used to transmit RPU/OIT alarms remotely via the phone. There are four (4) outputs from the RPU for the purpose of autodialer and they are as follow:

1) High Level Alarm – the upstream level is above the “high-high” alarm set point or loss of echo from any of the level transmitters.

2) Gates Malfunction - any one of the gates has a “failed to reach set point” alarm or low oil level or low oil pressure or high oil temperature

3) Intrusion Unauthorized Chamber or Street Panel Access and Fire Alarm – security system has detected a possible intrusion or fire alarm.

4) Loss of Power – the RPU has detected a 120VAC power loss.

3.9 Trending The current OIT model specified for this project does not support trending.

20 of 307


Appendix I: Gate Alarms List

Table 7: Gate Alarms List

Source/Output Device Alarm Description Tag Name

Gate 1 (COL-MTI-G-0101) Fail to Reach Setpoint COL-MTI-G-0101-SCYU-R Gate 2 (COL-MTI-G-0102) Fail to Reach Setpoint COL-MTI-G-0102-SCYU-R

21 of 307


Appendix II: Pump Alarms List

Table 8: Pump Alarms List



Fail to Start COL-MTI-P-0101-MNXA-R Fail to Stop COL-MTI-P-0101-MLBXA-R Uncommanded Start COL-MTI-P-0101-MNUXA-R Uncommanded Stop COL-MTI-P-0101-MLBUXA-R Not Available Warning COL-MTI-P-0101-YA-R Motor Overload (General Alarm) COL-MTI-P-0101-XA-R


Fail to Open COL-MTI-P-0102-MNXA-R Fail to Close COL-MTI-P-0102-MLBXA-R Uncommanded Open COL-MTI-P-0102-MNUXA-R Uncommanded Close COL-MTI-P-0102-MLBUXA-R Not Available Warning COL-MTI-P-0102-YA-R Motor Overload (General Alarm) COL-MTI-P-0102-XA-R

22 of 307


Appendix III: Analog Setpoints/Alarms Table

Table 9: Analog Alarm Setpoints

Source/Output Device Alarm Setpoint Description Tag Name

Upstream Level (COL-MTI-LIT-0101-LI)

Low-Low Setpoint COL-MTI-LIT-0101-XALLC-C Low Setpoint COL-MTI-LIT-0101-XALC-C High Setpoint COL-MTI-LIT-0101-XAHC-C High-High Setpoint COL-MTI-LIT-0101-XAHHC-C

Downstream Level (COL-MTI-LIT-0102-LI)

Low-Low Setpoint COL-MTI-LIT-0102-XALLC-C Low Setpoint COL-MTI-LIT-0102-XALC-C High Setpoint COL-MTI-LIT-0102-XAHC-C High-High Setpoint COL-MTI-LIT-0102-XAHHC-C

Hydraulic System Pressure (COL-MTI-PIT-0100-PI)

Low-Low Setpoint COL-MTI-PIT-0100-XALLC-C Low Setpoint COL-MTI-PIT-0100-XALC-C High Setpoint COL-MTI-PIT-0100-XAHC-C High-High Setpoint COL-MTI-PIT-0100-XAHHC-C

23 of 307


Table 10: Analog Alarms


Upstream Level (COL-MTI-LIT-0101-LI)

Low-Low Alarm COL-MTI-LIT-0101-LALL-R Low Alarm COL-MTI-LIT-0101-LAL-R High Alarm COL-MTI-LIT-0101-LAH-R High-High Alarm COL-MTI-LIT-0101-LAHH-R Out of Range Low Alarm COL-MIT-LIT-0101-XAL-R Out of Range High Alarm COL-MIT-LIT-0101-XAH-R Loss of Echo Alarm COL-MIT-LIT-0101-AXA

Downstream Level (COL-MTI-LIT-0102-LI)

Low-Low Alarm COL-MTI-LIT-0102-LALL-R Low Alarm COL-MTI-LIT-0102-LAL-R High Alarm COL-MTI-LIT-0102-LAH-R High-High Alarm COL-MTI-LIT-0102-LAHH-R Out of Range Low Alarm COL-MIT-LIT-0102-XAL-R Out of Range High Alarm COL-MIT-LIT-0102-XAH-R Loss of Echo Alarm COL-MIT-LIT-0102-AXA

Hydraulic System Pressure (COL-MTI-PIT-0100-PI)

Low-Low Alarm COL-MTI-PIT-0100-PALL-R Low Alarm COL-MTI-PIT-0100-PAL-R High Alarm COL-MTI-PIT-0100-PAH-R High-High Alarm COL-MTI-PIT-0100-PAHH-R Out of Range Low Alarm COL-MIT-PIT-0100-XAL-R Out of Range High Alarm COL-MIT-PIT-0100-XAH-R

24 of 307


Appendix IV: Default Initial Parameters Table

Note that these values are hard-coded in the PLC program and get downloaded once every time the SPU starts up. Access and alterations of these constants are available to a technician/programmer via PLC programming interface software. Table 11: Default Parameters Table – Initial Values

Source/Output Device Description Tag Name

Initial Value

Upstream Level Transmitter (COL-

MTI-LIT-0101)

LIT 0101 LEVEL OUT OF RANGE HIGH COL_MTI_LIT_0101_XAH_V 32320

LIT 0101 LEVEL OUT OF RANGE LOW COL_MTI_LIT_0101_XAL_V -320

LIT 0101 LEVEL LOW SIGNAL CLAMP COL_MTI_LIT_0101_MIN_V 0

LIT 0101 LEVEL ALARM HIGH HIGH CTR PRESET COL_MTI_LIT_0101_DBHH_V 5

LIT 0101 LEVEL ALARM HIGH CTR PRESET COL_MTI_LIT_0101_DBH_V 5

LIT 0101 LEVEL ALARM LOW CTR PRESET COL_MTI_LIT_0101_DBL_V 5

LIT 0101 LEVEL ALARM LOW LOW CTR PRESET COL_MTI_LIT_0101_DBLL_V 5

LIT 0101 LEVEL OUT OF RANGE HIGH CTR PRESET COL_MTI_LIT_0101_DBXL_V

5

LIT 0101 LEVEL OUT OF RANGE LOW CTR PRESET COL_MTI_LIT_0101_DBXH_V

5

LIT 0101 LEVEL ALARM HIGH HIGH RESET DEADBAND COL_MTI_LIT_0101_DBHHC_V

2

LIT 0101 LEVEL ALARM HIGH RESET DEADBAND COL_MTI_LIT_0101_DBHC_V 2

LIT 0101 LEVEL ALARM LOW RESET DEADBAND COL_MTI_LIT_0101_DBLC_V 2

LIT 0101 LEVEL ALARM LOW LOW RESET DEADBAND COL_MTI_LIT_0101_DBLLC_V

2

LIT 0101 LEVEL OUT OF RANGE HIGH RESET DEADBAND COL_MTI_LIT_0101_DBXAHC_V

2

LIT 0101 LEVEL OUT OF RANGE LOW RESET DEADBAND COL_MTI_LIT_0101_DBXALC_V

-2

25 of 307



Initial Value

Downstream Level Transmitter (COL-

MTI-LIT-0102)

LIT 0102 LEVEL OUT OF RANGE HIGH COL_MTI_LIT_0102_XAH_V 32320

LIT 0102 LEVEL OUT OF RANGE LOW COL_MTI_LIT_0102_XAL_V -320

LIT 0102 LEVEL LOW SIGNAL CLAMP COL_MTI_LIT_0102_MIN_V 0

LIT 0102 LEVEL ALARM HIGH HIGH CTR PRESET COL_MTI_LIT_0102_DBHH_V 5

LIT 0102 LEVEL ALARM HIGH CTR PRESET COL_MTI_LIT_0102_DBH_V 5

LIT 0102 LEVEL ALARM LOW CTR PRESET COL_MTI_LIT_0102_DBL_V 5

LIT 0102 LEVEL ALARM LOW LOW CTR PRESET COL_MTI_LIT_0102_DBLL_V 5

LIT 0102 LEVEL OUT OF RANGE HIGH CTR PRESET COL_MTI_LIT_0102_DBXL_V

5

LIT 0102 LEVEL OUT OF RANGE LOW CTR PRESET COL_MTI_LIT_0102_DBXH_V

5

LIT 0102 LEVEL ALARM HIGH HIGH RESET DEADBAND COL_MTI_LIT_0102_DBHHC_V

2

LIT 0102 LEVEL ALARM HIGH RESET DEADBAND COL_MTI_LIT_0102_DBHC_V 2

LIT 0102 LEVEL ALARM LOW RESET DEADBAND COL_MTI_LIT_0102_DBLC_V 2

LIT 0102 LEVEL ALARM LOW LOW RESET DEADBAND COL_MTI_LIT_0102_DBLLC_V

2

LIT 0102 LEVEL OUT OF RANGE HIGH RESET DEADBAND COL_MTI_LIT_0102_DBXAHC_V

2

LIT 0102 LEVEL OUT OF RANGE LOW RESET DEADBAND COL_MTI_LIT_0102_DBXALC_V

-2

26 of 307



Initial Value

Hydraulic Pressure Transmitter (COL-

MTI-PIT-0100)

PIT 0100 LEVEL OUT OF RANGE HIGH COL_MTI_PIT_0100_XAH_V 32000

PIT 0100 LEVEL OUT OF RANGE LOW COL_MTI_PIT_0100_XAL_V 0

PIT 0100 LEVEL LOW SIGNAL CLAMP COL_MTI_PIT_0100_MIN_V 0

PIT 0100 LEVEL ALARM HIGH HIGH CTR PRESET COL_MTI_PIT_0100_DBHH_V 5

PIT 0100 LEVEL ALARM HIGH CTR PRESET COL_MTI_PIT_0100_DBH_V 5

PIT 0100 LEVEL ALARM LOW CTR PRESET COL_MTI_PIT_0100_DBL_V 5

PIT 0100 LEVEL ALARM LOW LOW CTR PRESET COL_MTI_PIT_0100_DBLL_V 5

PIT 0100 LEVEL OUT OF RANGE HIGH CTR PRESET COL_MTI_PIT_0100_DBXL_V

5

PIT 0100 LEVEL OUT OF RANGE LOW CTR PRESET COL_MTI_PIT_0100_DBXH_V

5

PIT 0100 LEVEL ALARM HIGH HIGH RESET DEADBAND COL_MTI_PIT_0100_DBHHC_V

2

PIT 0100 LEVEL ALARM HIGH RESET DEADBAND COL_MTI_PIT_0100_DBHC_V 2

PIT 0100 LEVEL ALARM LOW RESET DEADBAND COL_MTI_PIT_0100_DBLC_V 2

PIT 0100 LEVEL ALARM LOW LOW RESET DEADBAND COL_MTI_PIT_0100_DBLLC_V

2

27 of 307



Initial Value

Gate 1 Position Indicator

(COL_MTI_G_0101)

G 0101 LEVEL OUT OF RANGE HIGH COL_MTI_G_0101_XAH_V 32320

G 0101 LEVEL OUT OF RANGE LOW COL_MTI_G_0101_XAL_V -320

G 0101 LEVEL LOW SIGNAL CLAMP COL_MTI_G_0101_MIN_V 0

G 0101 LEVEL OUT OF RANGE HIGH CTR PRESET COL_MTI_G_0101_DBXL_V

5

G 0101 LEVEL OUT OF RANGE LOW CTR PRESET COL_MTI_G_0101_DBXH_V

5

G 0101 LEVEL OUT OF RANGE HIGH RESET DEADBAND COL_MTI_G_0101_DBXAHC_V

2

G 0101 LEVEL OUT OF RANGE LOW RESET DEADBAND COL_MTI_G_0101_DBXALC_V

-2

Gate 2 Position Indicator (COL_MTI_G_0102)

G 0102 LEVEL OUT OF RANGE HIGH COL_MTI_G_0102_XAH_V 32320

G 0102 LEVEL OUT OF RANGE LOW COL_MTI_G_0102_XAL_V -320

G 0102 LEVEL LOW SIGNAL CLAMP COL_MTI_G_0102_MIN_V 0

G 0102 LEVEL OUT OF RANGE HIGH CTR PRESET COL_MTI_G_0102_DBXL_V

5

G 0102 LEVEL OUT OF RANGE LOW CTR PRESET COL_MTI_G_0102_DBXH_V

5

G 0102 LEVEL OUT OF RANGE HIGH RESET DEADBAND COL_MTI_G_0102_DBXAHC_V

2

G 0102 LEVEL OUT OF RANGE LOW RESET DEADBAND COL_MTI_G_0102_DBXALC_V

-2

28 of 307



Initial Value

Interval and Duration Time Set points for P-

Trap Valve V 0100 (COL_MTI_V_0101)

P-TRAP VALVE INTERVAL TIME SETPOINT (min) COL_MTI_V_0100_TINT_C

715

P-TRAP VALVE DURATION TIME SETPOINT (min) COL_MTI_V_0100_TDUR_C

5

Head Differential Level Low/High Set

points

LIT 0101 LEVEL LO SETPOINT (mm) COL_MTI_LIT_0101_OSP_C 890

LIT 0101 LEVEL HI SETPOINT (mm) COL_MTI_LIT_0101_CSP_C 760

Default Gate 1 &2 Open/Close Position

Set points

GATE 0101 OPEN TO POS ENTER FROM SCADA (%) COL_MTI_G_0101_DRY_C 83

GATE 0101 CLOSE TO POS ENTER FROM SCADA (%) COL_MTI_G_0101_WET_C

40

GATE 0102 OPEN TO POS ENTER FROM SCADA (%) COL_MTI_G_0102_DRY_C 83

GATE 0102 CLOSE TO POS ENTER FROM SCADA (%) COL_MTI_G_0102_WET_C

40

Hydraulic Oil Pressure Min/Max Set points

PIT 0100 PRESS MIN SETPOINT (kPa) COL_MTI_PIT_0100_LSP_C 20685

PIT 0100 PRESS MAX SETPOINT (kPa) COL_MTI_PIT_0100_HSP_C 10342

Upstream Level Transmitter Alarm Set points LIT 1

LIT 0101 LEVEL ALARM HIGH HIGH (mm) COL_MTI_LIT_0101_XAHHC_C

LIT 0101 LEVEL ALARM HIGH (mm) COL_MTI_LIT_0101_XAHC_C

LIT 0101 LEVEL ALARM LOW (mm) COL_MTI_LIT_0101_XALC_C

LIT 0101 LEVEL ALARM LOW LOW (mm) COL_MTI_LIT_0101_XALLC_C

Downstream Level Transmitter Alarm Set points LIT 2

LIT 0102 LEVEL ALARM HIGH HIGH (mm) COL_MTI_LIT_0102_XAHHC_C

LIT 0102 LEVEL ALARM HIGH (mm) COL_MTI_LIT_0102_XAHC_C

LIT 01021 LEVEL ALARM LOW (mm) COL_MTI_LIT_0102_XALC_C -

LIT 0102 LEVEL ALARM LOW LOW (mm) COL_MTI_LIT_0102_XALLC_C

29 of 307



Initial Value

Hydraulic Pressure Transmitter Alarm Set points PIT 1

PIT 0100 PRES ALARM HIGH HIGH (kPa) COL_MTI_PIT_0100_XAHHC_C 22750

PIT 0100 PRES ALARM HIGH (kPa) COL_MTI_PIT_0100_XAHC_C 21715

PIT 0100 PRES ALARM LOW (kPa) COL_MTI_PIT_0100_XALC_C 9308

PIT 0100 PRES ALARM LOW LOW (kPa) COL_MTI_PIT_0100_XALLC_C 8273

30 of 307

MTI CHAMBER #14C

PROCESS CONTROL NARRATIVES

Version Date Description

1.0 Draft Sept. 21, 2006 DRAFT for discussion 2.0 March 28, 2008 Issued for 100% submission 3.0 July 25, 2008 Issued for addendum 4.0 Nov 30, 2008 Issued for submission as per comment. 5.0 Feb 4, 2011 Issued for submission by Summa Engineering Limited 6.0 Apr 14, 2011 Issued for submission as per comments 6.1 June 24, 2011 Modified to reflect change instruction in RFQXX 6.2 July 21, 2001 Modified to reflect recent PCN review discussions on July 15. 6.3 July 26,2011 Minor Clean-up 6.4 Aug 4,2011 Minor Clean-up

31 of 307

Doc #10310 - 01 v6.3 – Aug 4, 2011 MTI Chamber #14C Process Control Narratives, Page i

TABLE OF CONTENTS

1. SCOPE OF DOCUMENT .................................................................................................................... 3

2. PROCESS DESCRIPTION ................................................................................................................. 3

2.1 PROCESS DEFINITION ................................................................................................................... 3 2.1.1 Catchments ............................................................................................................................. 3 2.1.2 Ashbridges Bay Collection System ......................................................................................... 4 2.1.3 Mid-Toronto Interceptor (MTI) .............................................................................................. 5

2.1.3.1 Diversion Chambers (27a, 27b, 27c, 23a, 23b, 23d, 23e, 20a, 20b, 20c, 20d, 7a, 7b, 7c and 7d) ...... 5 2.1.3.2 Major Interceptor Chambers (34, 29, 24, 20, 14c and 1) ................................................................... 6

2.1.4 MTI Chamber #14C (Rosedale Valley Road) ......................................................................... 6 2.2 OBJECTIVES ................................................................................................................................. 7 2.3 PROCESS CONTROL STRATEGY .................................................................................................... 7 2.4 INFLUENT SOURCES ..................................................................................................................... 8 2.5 EFFLUENT DESTINATION .............................................................................................................. 8 2.6 EQUIPMENT .................................................................................................................................. 8

2.6.1 Process ................................................................................................................................... 8

3. CONTROL DESCRIPTION ............................................................................................................... 9

3.1 CONTROL HIERARCHY ................................................................................................................. 9 3.2 CONTROL AND MONITORING OBJECTIVES .................................................................................. 10 3.3 GATE CONTROL ......................................................................................................................... 10

3.3.1 General ................................................................................................................................. 10 3.3.2 Computer Manual Mode ....................................................................................................... 10 3.3.3 Computer Auto Mode ............................................................................................................ 10 3.3.4 Operation in Failure Mode ................................................................................................... 11 3.3.5 Gate Computer Auto Control Summary ................................................................................ 11 3.3.6 Level 1 Control Hierarchy .................................................................................................... 12 3.3.7 Level 2 Control Hierarchy .................................................................................................... 12 3.3.8 Interlocks .............................................................................................................................. 13

3.3.8.1 Software Interlocks ......................................................................................................................... 13 3.4 HYDRAULIC SYSTEM PUMP CONTROL ........................................................................................ 13

3.4.1 General ................................................................................................................................. 13 3.4.2 Computer Manual ................................................................................................................. 13 3.4.3 Computer Auto ...................................................................................................................... 14

3.5 OTHER PROCESS MONITORING AND CONTROL ........................................................................... 14 3.5.1 Level 1 .................................................................................................................................. 14 3.5.2 Level 2 .................................................................................................................................. 14

3.5.2.1 Analog Setpoints/Alarms ................................................................................................................ 14 3.6 RPU INPUTS/OUTPUTS ............................................................................................................... 15 3.7 SECURITY ................................................................................................................................... 17

3.7.1 Local Operator Interface Security ........................................................................................ 17 3.7.2 Chamber Access Security ..................................................................................................... 17

3.8 ALARM DIALER .......................................................................................................................... 18 3.9 TRENDING .................................................................................................................................. 18

APPENDIX I: GATE ALARMS LIST ..................................................................................................... 19

APPENDIX II: PUMP ALARMS LIST ................................................................................................... 20

32 of 307

Doc #10310 - 01 v6.3 – Aug 4, 2011 MTI Chamber #14C Process Control Narratives, Page ii

APPENDIX III: ANALOG SETPOINTS/ALARMS TABLE ................................................................ 21

APPENDIX IV: DEFAULT INITIAL PARAMETERS TABLE ........................................................... 23

LIST OF TABLES

Table 1: Referenced Documents ..................................................................................................................... 3 Table 2: Major Equipment - MTI Chamber #14C .......................................................................................... 8 Table 3: Gate Control Setpoints ................................................................................................................... 10 Table 4: HPUI Control Setpoints .................................................................................................................. 14 Table 5: RPU I/O List................................................................................................................................... 15 Table 6: Gate Alarms List ............................................................................................................................ 19 Table 7: Pump Alarms List ........................................................................................................................... 20 Table 8: Analog Alarm Setpoints ................................................................................................................. 21 Table 9: Analog Alarms ............................................................................................................................... 22 Table 10: Default Parameters Table – Initial Values .................................................................................... 23 LIST OF FIGURES

Figure 1: City of Toronto Catchments ............................................................................................................ 4 Figure 2: MTI and Its Components ................................................................................................................ 4 Figure 3: Mid Toronto Interceptor .................................................................................................................. 5 Figure 4: Diversion Chamber ......................................................................................................................... 6 Figure 5: Interceptor Chamber ....................................................................................................................... 6 Figure 6: Process Diagram ............................................................................................................................. 7 Figure 7: Control Hierarchy ........................................................................................................................... 9

33 of 307

Doc #10310 - 01 v6.3 – Aug 4, 2011 MTI Chamber #14C Process Control Narratives, Page 3

1. SCOPE OF DOCUMENT

This document defines the process narratives for the Mid-Toronto Interceptor (MTI) Chamber #14C (Rosedale Valley Road). The document follows City of Toronto’s standard defined in the Process Control System Implementation Manual, Version 1, September 19, 2005. This document consists of two main sections, process description and control description. Process description includes process definition, objectives and process equipment. Control description includes a description of the control system including control logic and I/O. Table 1: Referenced Documents

Document Title Docs Open #

MTI Chamber #14C P&ID – Contract Drawing No. 1269-2008-01-40 Sht. I01

Process Control System Implementation Manual, Version 1, September 19, 2005

2. PROCESS DESCRIPTION

2.1 Process Definition

2.1.1 Catchments The City of Toronto has three Catchments, each includes a Collection System and a Treatment Plant. The three Catchments are Humber, Ashbridges Bay and Highland Creek. The collection systems operate independently except for one situation, where sludge from Humber gets transferred to Ashbridges Bay. The collection systems consist of trunk sewer, monitoring points, billing locations, storage facilities, pump stations, and regulating chambers. The collection system is shown in figure 1.

34 of 307


Humber Collection System

Humber Treatment Plant

Humber Catchment

Sanitary Combined


Ashbridges Bay Collection System

Ashbridges Bay Treatment Plant

Ashbridges Bay Catchment

Sanitary Combined


Sludge To MTI

CSO To Lake Ontario“T” Building and “M” Building Bypass

Highland Creek Collection System

Highland Creek Treatment Plant

Highland Creek Catchment

Sanitary


Pumping Station BypassCSO and Pumping

Station Bypass

WastewaterFrom Peel

WastewaterTo Peel

City of Toronto Catchments

Figure: City of Toronto Catchments Figure 1: City of Toronto Catchments

2.1.2 Ashbridges Bay Collection System The Ashbridges Bay collection system consists of three Interceptors: MTI (Mid-Toronto Interceptor), LLI (Low Level interceptor) and HLI (High Level Interceptor). Interceptor sewers are large diameter sewers that collect flow from local combined systems and transport flow to pumping stations or treatment plants. The three interceptors are depicted in figure 2.

Figure 2: MTI and Its Components

35 of 307


The components shown include the Mid-Toronto Interceptor (MTI), Low Level Interceptor (LLI), High Level Interceptor (HLI), the Ashbridges Bay Treatment Plant M Building and T Building pumping stations, and various chambers.

2.1.3 Mid-Toronto Interceptor (MTI) The Mid-Toronto Interceptor (MTI) is a 13.5 km tunnel ranging in size from 1500 mm to 3000 mm in diameter. It conveys flows intercepted from the local municipal combined collection system, flows diverted from the LLI and HLI, and sludge from Humber Treatment Plant. The MTI drains to the T Building Pumping Station where it is either pumped or flows by gravity to the Ashbridges Bay Treatment Plant. The Mid Toronto Interceptor (MTI) intercepts flow from across Toronto, predominately from the City of Toronto service area. The MTI also provides relief capacity for the High Level Interceptor (HLI) and the Low Level Interceptor (LLI). There are three chamber types in the system: interceptor, diversion, and dome. Interceptor chambers intercept the flow from local systems into the MTI. Diversion chambers divert the flow from the High Level Interceptor (HLI) and the Low Level Interceptor (LLI) to the MTI (which is at a lower level). There are six Interceptor chambers (34, 29, 24, 20, 14c, and 1) and four sets of Diversion chambers (27a b and c, 23 a b c d and e, 20 a b c and d and 7 a b c and d). Dome chambers are used to provide access to the MTI for maintenance and level monitoring. The process block diagram is shown in figure 3.

Figure 3: Mid Toronto Interceptor

2.1.3.1 Diversion Chambers (27a, 27b, 27c, 23a, 23b, 23d, 23e, 20a, 20b, 20c, 20d, 7a, 7b, 7c and 7d) Diversion Chambers divert flow from the HLI and the LLI to the MTI through the Carlaw Avenue, Victoria Street, Simcoe Street and Strachan Avenue Interceptors. A Diversion Chamber is a combination of diversion and flow control structures. These chambers have three primary functions: divert flow; drop flow down to the elevation of the MTI; and flow regulation. Wastewater flow initially enters the Diversion chamber and passes through a diversion structure where flow is diverted from the LLI or HLI to a connecting sewer, ultimately to the MTI. Following the diversion, the flow drops down to the elevation of the MTI, as the HLI and LLI are at higher elevations. The flow drop structure is located in the same chamber as the diversion structure or in a second chamber

36 of 307


downstream of the diversion structure. Prior to flow entering the inter-connecting sewer, flow passes through a sluice gate. The block diagram is shown in figure 4.

DiversionControl

Structure

DropPipe

Flow ControlStructure

InfluentHLI,LLI

EffluentTo MTI

Figure: Diversion Chamber Figure 4: Diversion Chamber

2.1.3.2 Major Interceptor Chambers (34, 29, 24, 20, 14c and 1) Interceptor chambers intercept flow from local systems into the MTI. There are twenty-four Interceptor chambers associated with the MTI. Out of these, six Major Interceptor chambers account for approximately 75% to 80% of the intercepting capacity of the MTI at present. Other smaller interceptor chambers account for the remaining 20% to 25%. Flow enters an Interceptor chamber, passes through a diversion structure consisting of one to three sluice gates, and drops through a vortex down into the MTI. The block diagram is shown in figure 5.

Figure 5: Interceptor Chamber

2.1.4 MTI Chamber #14C (Rosedale Valley Road) MTI Chamber #14C is a part of the overall Mid-Toronto Interceptor System. The chamber is located on Rosedale Valley Road. It is an interceptor chamber, with functionality as described above. The process diagram is shown below:

37 of 307


Figure 6: Process Diagram The chamber consists of one gate. Chamber levels on either side of the gate are monitored.

2.2 Objectives The overall objective and goals for the Collection System are:

1. Maintain system capacity 2. Minimize volume and frequency of overflows 3. Minimize volume and frequency of bypassing at the Treatment Plant 4. Prevent basement flooding occurrences 5. Maximize treatment of intercepted wastewater and combined flow 6. Minimize cost of Collection System operation

The process objective for MTI Chamber #14C is to intercept local system flows to the MTI, in a manner to support the overall Collection System objectives. All key parameters will be monitored.

2.3 Process Control Strategy The MTI can be operated by gravity or with pumping to the Ashbridges Bay Treatment Plant. Under pumping operations, the MTI can reach a hydraulic capacity of 20.84 m3/s, however the outlet pumping capacity is limited to 11.13 m3/s. By gravity, the MTI acts as an inverted siphon and has a capacity of 11.13 m3/s. The MTI runs in a continuous pump-down mode to maximize the capacity of the MTI, HLI and LLI interceptors during dry and wet weather periods. During dry weather flow, the hydraulic gradeline (HGL) of the MTI under pump-down operation is lower than the HGL for the LLI and the HLI and their interconnecting points. This allows flows to be diverted from the HLI and LLI to the MTI by gravity via connecting sewers creating downstream capacity for the LLI and HLI to intercept local municipal wastewater flows.

38 of 307


Sludge from the Humber Treatment Plant is also conveyed through the MTI ultimately to the Ashbridges Bay Treatment Plant. The sludge from the Humber TP is conveyed alternately through one of the two 250 mm forcemains that discharge into the upstream end of the MTI, at Parkside Drive (Chamber 34). The primary objectives of the MTI include:

To intercept as much sanitary and combined flows as possible. To protect the Ashbridges Bay Treatment Plant from flooding.

These objectives require a strategy that is system wide in nature and is not based on local control logic. A control strategy that is system wide will enable the operation of the MTI to be adapted to the hydrologic conditions and dynamic conditions in the collection system and at the Ashbridges Bay Treatment Plant. The present chamber upgrades will allow future implementation of such system wide strategies (Optimizer).

2.4 Influent Sources Local sewers

2.5 Effluent Destination MTI

2.6 Equipment

2.6.1 Process The chamber has one gate, designed to be locally controlled from OIT. Table 2: Major Equipment - MTI Chamber #14C

Description Tag Number

Gate 1 COL-MTI-G-1401C Level Meter, Upstream COL-MTI-LIT-1402C Level Meter, Downstream COL-MTI-LIT-1401C Hydraulic System Pump 1 COL-MTI-P-1401C Hydraulic System Pump 2 COL-MTI-P-1402C Pressure Meter, Hydraulic System COL-MTI-PIT-1400C

39 of 307


3. CONTROL DESCRIPTION

3.1 Control Hierarchy In general the control/monitoring hierarchy will comprise two levels:

Level 1: Field Device Control (Local) Level 2: Controller (PLC/RPU) Panel

For MTI Chamber #14C, the control/monitoring hierarchy will comprise two levels (see Figure 7). Each device can be operated from any of the levels provided for that device. Level 1 will be provided with a Local/Remote (L/R) switch, as explained below. The status of the L/R switch will be known to higher levels in the control hierarchy. There are no hardwired interlocks.

Level 1: Field Device Control (Local) A Local/Remote (L/R) switch will be provided at this level. To enable control from this level, the L/R switch needs to be into Local. By putting the L/R switch into Local, control of that device from higher levels within the control hierarchy will be disabled.

Level 2: Controller (RPU) Panel This level consists of the PLC/RPU for the chamber. Control/monitoring functionality will be programmed in the PLC/RPU. An Operator Interface Terminal (OIT) will be provided and this can be used for controlling the gates, maintenance and related activities.

Figure 7: Control Hierarchy

40 of 307


3.2 Control and Monitoring Objectives MTI Chamber #14C operates as an interceptor chamber, as described above. The objective is to intercept local system flows and prevent flooding at the treatment plant.

3.3 Gate Control

3.3.1 General The gate (COL-MTI-G-1401C) is operated to control the flow into the MTI. The gate will also be operated for maintenance purposes. The gate will have the following control modes:


The control modes will be set from the OIT. Software interlocks (for device operation in a specific mode, and for changing modes) will be programmed in the PLC/RPU., and are discussed below.

3.3.2 Computer Manual Mode In Computer Manual mode, the Gate system will be programmed to respond to an operator command (open, close, stop), provided that Computer Manual Operation Permissive (software interlock) is satisfied. Operator commands are set from the OIT Gate pop-up screen as Open/Stop/Close buttons. Levels in the Chamber, Gate position, status and possible alarms are displayed on Chamber and Alarm screens. The Computer Manual Operation Permissive allows for operation in this mode. The Computer Manual Operation Permissive “Gate available” allows for operation and entry in this mode and is always enabled

3.3.3 Computer Auto Mode In Computer Auto mode, the device will be programmed to open/close to specified/programmed gate positions, according to the conditions in the chamber downstream of the gate in chamber 14C at this point. In future the sensor may be relocated downstream of chamber 14C to chamber 14B if control of the system is not acceptable. The Average Level in the Chamber 14C will be constantly calculated and monitored. Averaging time is adjustable from OIT Set point screen. There are 6 Level setpoints, forming 7 “Stages” of level in the Chamber. The program will determine which of the “Stages” the current averaged level is located in. Based on the level location the gate will move to the respective Gate Position (See Gate Control Setpoints in Table 3 below). Note that there is a 1 position shift in gate positions related to level locations based on the direction of the level change (rising/falling). Below this requirement is described in more details. Table 3: Gate Control Setpoints Tag Name Description Comments COL_MTI_G_1401C_POS1_C Gate 1401C Open to Position 1 Setpoint 500 mm COL_MTI_G_1401C_POS2_C Gate 1401C Open to Position 2 Setpoint 570 mm

41 of 307


COL_MTI_G_1401C_POS3_C Gate 1401C Open to Position 3 Setpoint 640 mm COL_MTI_G_1401C_POS4_C Gate 1401C Open to Position 4 Setpoint 710 mm COL_MTI_G_1401C_POS5_C Gate 1401C Open to Position 5 Setpoint 780 mm COL_MTI_G_1401C_POS6_C Gate 1401C Open to Position 6 Setpoint 850 mm COL-MTI-LIT-1401C-LVL-POS1-C

Level LIT 14C Position 1 Setpoint 1000 mm

COL-MTI-LIT-1401C-LVL-POS2-C










The system will calculate the chamber level averaging and the gate commanded positions in timed cycles to prevent oscillation of device, should the level becomes unstable. The time cycle length is adjustable from the OIT Set point screen. Default time cycle length is set for 5 min. The gate will operate in Computer Auto mode provided that Auto Operation Permissive (software interlock) is satisfied. The Auto Operation Permissive “Gate not available” interlock must be cleared to enter this mode and operate in it.

3.3.4 Operation in Failure Mode If duty gate fails to reach the desired position setpoint, the gate control will be disabled, as further attempt to operate the gate may cause more damage. A “Gate Malfunction Alarm” is generated., an operator has to come to site and make a decision what action to take after troubleshooting.

If level transmitter lost its echo for 5 minutes continuously, duty gate to move to closed setpoint (minimum opening) until echo is restored. Auto dialer to send “High Level Alarm”. Upon restoration of echo consistently for 5 minutes, auto function is resumed.

3.3.5 Gate Computer Auto Control Summary Control is based on downstream (D/S) level transmitter. Duty gate travels from 500 mm to 850 mm Downstream level is averaged for 6-minute time period (operator adjustable) and will determine

gate position. Duty gate will move after level established and stay at this position until next level reading in 6

minutes. Duty gate level control as follows Note: Gate position is different based on rising or falling level. Rising Level

▪ 850 mm < Downstream level < 880 mm, gate fully open to 850 mm position

42 of 307


▪ 880 mm< Downstream level < 910 mm, gate move to 780 mm position ▪ 910 mm < Downstream level < 940 mm, gate move to 710 mm position ▪ 940 mm < Downstream level < 970 mm, gate move to 640 mm position ▪ 970 mm < Downstream level < 1000 mm, gate move to 570 mm position ▪ 1000 mm ≤ Downstream level, gate move to fully closed 500 mm position

Falling Level ▪ 970 mm < Downstream level < 1000 mm, no action gate stays in fully closed 500 mm

position ▪ 940 mm < Downstream level < 970 mm, gate move to 570 mm position ▪ 910 mm < Downstream level < 940 mm, gate move to 640 mm position ▪ 880 mm< Downstream level < 910 mm, gate move to 710 mm position ▪ 850 mm < Downstream level < 880 mm, gate fully open to 780 mm position ▪ Downstream level ≤ 820 mm, gate move to fully open 850 mm position

The specific functions for each level within the control hierarchy are discussed here. The gate can generally be commanded to open to any position between fully closed and fully open. Alarm conditions will prevent the gate from further operation, however they will not trigger them from Auto into Manual mode, that is, when and if the alarm is cleared, the gate will be available for automatic operation only with operator intervention.

3.3.6 Level 1 Control Hierarchy A gate operator panel located in close proximity to the gate will provide local equipment control. The following will be provided:

Local/Remote switch Open push-button Close push-button

3.3.7 Level 2 Control Hierarchy Level 2 consists of the PLC/RPU. Operator functionality is available through the OIT. The PLC/RPU will be programmed to provide the required control and monitoring functionality for the chamber. The following functionality will be provided:

Level 1 Local/Remote status (Computer Mode) Open command Close command Stop Command Computer Manual mode Gate position setpoints Control mode Command Gate Computer Auto mode level and position set-points Gate position indication (0-100%) Gate not available warning Other alarms

Refer to Appendix I for a list of alarms associated with the gates.

43 of 307


3.3.8 Interlocks

3.3.8.1 Software Interlocks The following permissives will be provided: Computer Manual Operation permissive: The following conditions will set the Manual Operation Permissive to NOT OK for the gates:

Gate general alarm (Gate failed to reach position setpoint alarm)

3.4 Hydraulic System Pump Control

3.4.1 General Hydraulic Power Unit (HPU) is a package controlled by the Remote Processing Unit (RPU) to ensure accumulators are properly charged to provide hydraulic power for gate operation. The pumps (COL-MTI-P-1401C and COL-MTI-P-1402C) are operated to maintain the pressure in the accumulators. Each pump will have the following control modes:


Further, the pumps will be assigned Duty and Standby. The control modes as well the duties will be set from the OIT. Software interlocks (for device operation in a specific mode, and for changing modes) will be programmed in the PLC/RPU., and are discussed below.

3.4.2 Computer Manual In Computer Manual mode, the system will be programmed to respond to an operator command (start or stop), provided that Manual Operation Permissive (software interlock) is satisfied. This interlock consists of

Low Oil Level, High Oil Temperature, and High/Low Out of Range Pressure Transmitter values.

Operator commands are set from the OIT Pump pop-up screens as Start/Stop buttons. Pressure in the Accumulator, Pump statuses and possible alarms are displayed on HPU and Alarm screens. The Computer Manual Operation Permissive allows for the entry and operation in this mode. Permissive signal consists of cleared interlock and alarms.

44 of 307


3.4.3 Computer Auto In Pump Computer Auto mode, the device will be programmed to start/stop according to the pressure of the accumulator. The control system will self-regulate accumulator pressure by turning on pumps (as required) to maintain proper stored energy for gate movement. PT1 (P1 and P2) will be determined to set MIN/MAX operational pressure conditions for the accumulators. Duty Pump will start when the operational pressure is below MIN pressure Setpoint and will stop when the operational pressure exceeds MAX pressure Setpoint. Only the pump specified as Duty will operate in this mode. If there are problems with the Duty pump, Standby pump will take over if it is in Computer Auto mode. Electric motors M1 (P-1401C) and M2 (P-1402C) will start alternatively when required to insure even wear. All HPU system inputs (T1, L1, DP, PT1) are utilized within the control system to insure hydraulic system remains in proper operational conditions. Same software interlock as in Manual mode (see par. 3.4.2) is applicable and will prevent the pumps from starting as well as pump’s alarms (see Pump Alarms List in Appendix II) generated by the system. Note that DP Filter Plugged input will not trigger Pumps’ General Alarm and request for Pumps’ Stop. However it will signal as a warning to inform operator of the necessity to replace the filter. T1 – Oil Temp High L1 – Oil Level Low DP – Filter Plugged PT1 – Pressure Transmitter (4-20 mA analog) Table 4: HPUI Control Setpoints Tag Name Description Comments COL-MTI-PIT-1400C-HSP-C Accumulator maximum pressure COL-MTI-PIT-1400C-LSP-C Accumulator minimum pressure The pump(s) will operate in this mode provided that Auto Operation Permissive (software interlock) is satisfied. The Auto Operation Permissive allows for operation in this mode and consists of the manual interlock signals (see par.3.4.2) and pump related alarms Refer to Appendix II for a list of alarms associated with the pumps.

3.5 Other Process Monitoring and Control

3.5.1 Level 1 Not required

3.5.2 Level 2 Upstream Level Downstream Level Gate 1 Position Hydraulic System Pressure Alarms

3.5.2.1 Analog Setpoints/Alarms A list of set points that can be adjusted through the Operator Interface is included herein as Appendix III.

45 of 307


3.6 RPU Inputs/Outputs The RPU I/O list is provided in table 6. Refer to the Process and Instrumentation Diagrams for more information. Table 5: RPU I/O List


Upstream Level Transmitter (COL-MTI-LIT-1401C)


COL-MTI-LIT-1401C-AXA DI

Station Level 1 COL-MTI-LIT-1401C-LI AI

Downstream Level Transmitter (COL-MTI-LIT-1402C)


COL-MTI-LIT-1402C-AXA DI

Station Level 2 COL-MTI-LIT-1402C-LI AI Gate 1 (COL-MTI-G-1401C)

Computer Mode COL-MTI-G-1401C-YN DI Position Indication COL-MTI-G-1401C-ZI AI Open Command COL-MTI-G-1401C-VH DO Close Command COL-MTI-G-1401C-VL DO Open Command Status COL-MTI-G-1401C-ZIH DO Close Command Status COL-MTI-G-1401C-ZIL DO

RPU (COL-MTI-RPU-1400C) RPU Power Failure Alarm

COL-MTI-RPU-1400C-EAL DI

UPS (COL-MTI-UPS-1400C)

Loss of Normal Power Alarm

COL-MTI-UPS-1400C-EAL DI

Transfer Switch Not On Normal Power COL-MTI-TS-1401C-EH DI

Door Switch (COL-MTI-ZSH-1401C) Door Opened Indication

COL-MTI-ZSH-1401C-ZLH DI

Smoke/Heat Detector (COL-MTI-FA-1401C)

Smoke/Heat Detection Alarm

COL-MTI-FA-1401C-TAH DI

Hydraulic System Pump 1 (COL-MTI-P-1401C)

Computer Mode COL-MTI-P-1401C-YN DI Running Status COL-MTI-P-1401C-MN DI Overload Status (General Alarm) COL-MTI-P-1401C-XA DI Start Command COL-MTI-P-1401C-MH DO Stop Command COL-MTI-P-1401C-MB DO

Hydraulic System Pump 2 (COL-MTI-P-1402C)

Computer Mode COL-MTI-P-1402C-YN DI Running Status COL-MTI-P-1402C-MN DI Overload Status (General Alarm) COL-MTI-P-1402C-XA DI Start Command COL-MTI-P-1402C-MH DO Stop Command COL-MTI-P-1402C-MB DO

46 of 307



Hydraulic Pressure Transmitter (COL-MTI-PIT-1400C)

Hydraulic Sys. Pressure Indication COL-MTI-PIT-1400C-PI

Hydraulic Sys. Low Oil Level Sensor (COL-MTI-LSL-1400C)

Hydraulic Sys. Low Oil Level

COL-MTI-LSL-1400C-LAL DI

Hydraulic Sys. High Oil Temperature Sensor (COL-MTI-TSH-1400C)

Hydraulic Sys. High Oil Temperature

COL-MTI-TSH-1400C-TAH DI

Hydraulic Sys. Filter Pressure Switch (COL-MTI-PSH-1400C)

Hydraulic Sys. Filter Plugged

COL-MTI-PSH-1401C-PAH DI

Auto Dialer (COL-MTI-ADL)

Autodialer – Level High Alarm

COL-MTI-ADL-1401C-LAH DO

Autodialer – Gates Malfunction Alarm

COL-MTI-ADL-1402C-FLT DO

Autodialer – Intrusion Alarm

COL-MTI-ADL-1403C-INT DO

Autodialer – Loss of Power Alarm

COL-MTI-ADL-1404C-EAL DO

47 of 307


3.7 Security

3.7.1 Local Operator Interface Security The MTI chamber is controlled via a local operator interface (OIT). To prevent unauthorized control to the equipment, the OIT restricts access to certain screens and displays. In order to access those screens, one must login with a valid user name and password, along with the proper security clearance level. Security clearance level is divided into three main categories as listed below: Master: Users logged in as Master have a Runtime Level of 999, giving them full permission. This includes the ability to change passwords and edit the User List. Operator: Users logged in as Operator have Runtime Level 2, giving them permission to access all screens that have security level 2 or below. That includes overview screens, Device control screens as well as Setpoint screens. Guest: Users logged in as Guest have Runtime Level 0, giving them permission to access only screens that have security