webinar-overview of fire pumps and water storage tanks
DESCRIPTION
FIRE PUMPS WEBINARTRANSCRIPT
Overview of Fire Pumps and Water Storage Tanks Webinar
1Proprietary Presentation by Koffel Associates, Inc.
M. Steven Welsh, P.E.
Registered FPE
Koffel Associates, Inc.
www.koffel.com
Overview of Fire Pumps and Water Storage Tanks
Expertly Engineering Safety From Fire
Outline
Introduction
Fire Pump Design
Water Tank Design
Coordinating with other trades
Deficiencies
Koffel Services
Consulting
Design
Construction Period Services
Overview of Fire Pumps and Water Storage Tanks Webinar
2Proprietary Presentation by Koffel Associates, Inc.
My Background
Graduated with Bachelor of Science in Fire Protection Engineering from the University of Maryland at College Park in 2002.
Worked in the United Kingdom.
Worked for sprinkler contractor.
Employed with Koffel for 9 years.
Registered engineer (DE and MD)
Standards
NFPA 20, Standard for the Installation of Stationary Pumps for Fire Protection, 2013 Edition
NFPA 22: Standard for Water Tanks for Private Fire Protection, 2013 Edition
Typical Arrangement
Overview of Fire Pumps and Water Storage Tanks Webinar
3Proprietary Presentation by Koffel Associates, Inc.
Typical Arrangement
Exterior Fire Pump House and Tank
Typical Arrangement
Electric Centrifugal (horizontal split-case)
Typical Arrangement
Centrifugal Cutaway: pressure is developed principally by an action away from center.
Overview of Fire Pumps and Water Storage Tanks Webinar
4Proprietary Presentation by Koffel Associates, Inc.
Typical Arrangement
Parts of Packing
Typical Arrangement
Vertical In-line
Typical Arrangement
Diesel
Overview of Fire Pumps and Water Storage Tanks Webinar
5Proprietary Presentation by Koffel Associates, Inc.
Typical Arrangement
Vertical Turbine
Typical Arrangement
Vertical Turbine Cutaway
Typical Arrangement
Packaged System
Overview of Fire Pumps and Water Storage Tanks Webinar
6Proprietary Presentation by Koffel Associates, Inc.
Typical Arrangement
Bolted Steel
Typical Arrangement
Bolted Steel
Typical Arrangement
Pressure Tank
Overview of Fire Pumps and Water Storage Tanks Webinar
7Proprietary Presentation by Koffel Associates, Inc.
Typical Arrangement
Fiberglass-Reinforced Plastic Tanks
New vs. Existing
New Work
Existing Document existing conditions
Check servicing
Sizing Pumps and Tanks
Sprinklers
Standpipes
Special hazards
Firefighting
Overview of Fire Pumps and Water Storage Tanks Webinar
8Proprietary Presentation by Koffel Associates, Inc.
Sizing Pumps and Tanks
Sizing Pumps and Tanks
The performance of the pump when applied at capacities over 140 percent of rated capacity can be adversely affected by the suction conditions.
Application of the pump at capacities less than 90 percent of the rated capacity is not recommended.
Fire Pump Design
Overview of Fire Pumps and Water Storage Tanks Webinar
9Proprietary Presentation by Koffel Associates, Inc.
Fire Pump Design
Fire Pump Design
Bypass: Where the suction supply is of sufficient pressure to be of material value without the pump, the pump shall be installed with a bypass [4.14.4.1]
Fire Pump Design
Elbows and tees with a centerline plane parallel to a horizontal split-case pump shaft must 10 times the suction pipe diameter away from the pump’s suction flange [4.14.6.3]
X
Overview of Fire Pumps and Water Storage Tanks Webinar
10Proprietary Presentation by Koffel Associates, Inc.
Fire Pump Design
Fire Pump Design
Fire Pump Design
Elbows and tees with a centerline plane perpendicular to the horizontal split-case pump shaft are permitted at any location
Overview of Fire Pumps and Water Storage Tanks Webinar
11Proprietary Presentation by Koffel Associates, Inc.
Fire Pump Design
X
Fire Pump Design
Strain Relief: where the pump and its suction supply are on separate foundations with rigid interconnecting pipe, the pipe must be provided with strain relief [4.14.6.5]
Valves: outside screw and yoke (OS&Y) gate valve must be installed in the suction pipe [4.14.5]
Fire Pump Design
Overview of Fire Pumps and Water Storage Tanks Webinar
12Proprietary Presentation by Koffel Associates, Inc.
Fire Pump Design
Fire Pump Design
Fire Pump Design
Overview of Fire Pumps and Water Storage Tanks Webinar
13Proprietary Presentation by Koffel Associates, Inc.
Fire Pump Design
Fire Pump Design
Eccentric tapered reducer or increaser required at pump suction to avoid air pockets [4.14.6.4 ]
Fire Pump Design
Eccentric tapered reducer
Overview of Fire Pumps and Water Storage Tanks Webinar
14Proprietary Presentation by Koffel Associates, Inc.
Fire Pump Design
Eccentric tapered reducer
Fire Pump Design
Fire Pump Design
No requirement at pump discharge, typically concentric
Overview of Fire Pumps and Water Storage Tanks Webinar
15Proprietary Presentation by Koffel Associates, Inc.
Fire Pump Design
Pressure gauges [4.10]
Fire Pump Design
Circulation Relief Valve: installed on the discharge side of the pump before the discharge check valve, valve shall provide flow of sufficient water to prevent the pump from overheating when operating with no discharge, nominal size of 0.75 inch(19 mm) [4.11]
Fire Pump Design
Overview of Fire Pumps and Water Storage Tanks Webinar
16Proprietary Presentation by Koffel Associates, Inc.
Circulation Relief Valve:
Fire Pump Design
Fire Pump Design
Check Valve: required in the pump discharge assembly. [4.15.6]
Fire Pump Design
Gate or butterfly valve: required in the pump discharge assembly. [4.15.7]
Overview of Fire Pumps and Water Storage Tanks Webinar
17Proprietary Presentation by Koffel Associates, Inc.
Fire Pump Design
Pressure Maintenance Pumps: sized to replenish the fire protection system pressure due to allowable leakage and normal drops in pressure, no listing required [4.25]
Fire Pump Design
The jockey pump stop point should equal the pump churn pressure plus the minimum static supply pressure.
The jockey pump start point should be at least 10 psi (0.68 bar) less than the jockey pump stop point.
The fire pump start point should be 5 psi (0.34 bar) less than the jockey pump start point.
Fire Pump Design
100 psi pump at churn, 50 psi minimum from city
Jockey pump stop = 100 psi + 50 psi = 150 psi
Jockey pump start = 150 psi − 10 psi = 140 psi
Fire pump start = 140 psi − 5 psi = 135 psi
Overview of Fire Pumps and Water Storage Tanks Webinar
18Proprietary Presentation by Koffel Associates, Inc.
Fire Pump Design
Fire Department Connection
Fire Department Connection
Fire Pump Design
Fire Pump Design
Test Header
Overview of Fire Pumps and Water Storage Tanks Webinar
19Proprietary Presentation by Koffel Associates, Inc.
Fire Pump Design
Fire Department Connection and Test Header
Fire Pump Design
Maximum Pressure for Centrifugal Pumps [4.7.7]
The net pump shutoff (churn) pressure plus the maximum static suction pressure, adjusted for elevation, must not exceed the pressure for which the system components are rated.
Fire Pump Design
Maximum Pressure for Centrifugal Pumps [4.7.7]
Variable speed pressure limiting control drivers, as defined in this Standard, shall be acceptable to limit system pressure.
Overview of Fire Pumps and Water Storage Tanks Webinar
20Proprietary Presentation by Koffel Associates, Inc.
Fire Pump Design
Pressure Regulating Devices: No pressure regulating devices must be installed in the discharge pipe [4.15.10]
Exceptions
Fire Pump Design
Pressure Regulating Devices, exceptions:
Where a diesel engine fire pump is installed and where a total of 121 percent of the net rated shutoff (churn) exceeds system rating
Where an electric variable speed pressure limiting controller or a diesel pressure limiting driver is installed
Fire Pump Design
Nameplate [4.9]
Overview of Fire Pumps and Water Storage Tanks Webinar
21Proprietary Presentation by Koffel Associates, Inc.
Fire Pump Design - Diesel
Fire Pump Design - Diesel
Requires sprinkler protection [4.12.1.3]
Enclosing diesel engine pump drivers and day tanks
Fire Pump Design - Diesel
Exhaust Piping: [11.5.2]
Each pump engine must have an independent exhaust system.
A flexible connection with a section of stainless steel, not less than 12 in. (305 mm) in length must be made between the engine exhaust outlet and exhaust pipe.
The exhaust pipe shall be covered with high-temperature insulation or otherwise guarded to protect personnel from injury.
Exhaust pipes passing directly through combustible roofs or walls must be guarded at the point of passage
Overview of Fire Pumps and Water Storage Tanks Webinar
22Proprietary Presentation by Koffel Associates, Inc.
Fire Pump Design - Diesel
Fire Pump Design - Diesel
Exhaust Discharge Location: [11.5.3]
Exhaust from the engine shall be piped to a safe point outside the pump room and arranged to exclude water.
Exhaust gases shall not be discharged where they will affect persons or endanger buildings.
Fire Pump Design
Flow Meter
Overview of Fire Pumps and Water Storage Tanks Webinar
23Proprietary Presentation by Koffel Associates, Inc.
Fire Pump Design
Vertical Turbine Pump:
Fire Pump Design
Suction Screening: where the water supply is obtained from an open source such as a pond or wet pit, the passage of materials that might clog the pump shall be obstructed [4.14.8.1]
Tank Design
Overview of Fire Pumps and Water Storage Tanks Webinar
24Proprietary Presentation by Koffel Associates, Inc.
Tank Design
OSHA-compliant (29 CFR 1910) standard railing shall be placed around the roof manholes and other accessories that require access [4.14.1.1]
Tank Design
Tank Design
Where the steel roof is essentially airtight, there must be a substantial vent above the maximum water level [4.15.1]
Overview of Fire Pumps and Water Storage Tanks Webinar
25Proprietary Presentation by Koffel Associates, Inc.
Tank Design
Tank Design
Water-Level Gauge: “suitable design” [14.1.8]
Tank Design
Water-Level Gauge: “suitable design” [14.1.8]
Overview of Fire Pumps and Water Storage Tanks Webinar
26Proprietary Presentation by Koffel Associates, Inc.
Tank Design
Controlling Valve: [14.2.12]
Tank Design
Anti-Vortex Plate Assembly [14.2.13]
Tank Design
A permanent pipe connected to a water supply shall be provided to fill the tank [14.4.1]
The means to fill the tank shall be sized to fill the tank in a maximum time of 8 hours [14.4.2]
Overview of Fire Pumps and Water Storage Tanks Webinar
27Proprietary Presentation by Koffel Associates, Inc.
Tank Design
Overflow: the overflow pipe shall be of adequate capacity for the operating conditions and shall be of not less than 3 inches (75 mm) [14.6]
Tank Design
Tank Riser Drain: A drain pipe of at least 2 inch (50 mm) must be connected into the tank discharge pipe near its base [14.7.4]
Tank Design - Heating
Tanks that are subject to freezing shall be heated [16.1.1]
The heating system must be of such capacity that the temperature of the coldest water in the tank or tank riser, or both, is maintained at or above 42°F (5.6°C) during the coldest weather
Overview of Fire Pumps and Water Storage Tanks Webinar
28Proprietary Presentation by Koffel Associates, Inc.
Tank Design - Heating
Coordination with Other Trades
Fire-Resistive Construction [NFPA 20, 4.12]
2-hour High-rise building
Not full sprinkler protected.
Outdoor: 50 feet (15.3 m) away from any fire exposures
Otherwise, 1-hour
Coordination with Other Trades
Ventilation for diesel fire pumps shall be provided for the following functions: [11.3.2.1]
To control the maximum temperature to 120°F (49°C) at the combustion air cleaner inlet with engine running at rated load
To supply air for engine combustion
To remove any hazardous vapors
To supply and exhaust air as necessary for radiator cooling of the engine when required
Overview of Fire Pumps and Water Storage Tanks Webinar
29Proprietary Presentation by Koffel Associates, Inc.
Coordination with Other Trades
Fire alarm must monitor for the following supervisory signals: [NFPA 20, 10.4.7.2.2]
Fire Pump Running
Loss of Phase
Phase Reversal
Connected to alternate source (if applicable)
Nothing else is required to be supervised
Jockey Pump running should not be monitored
Coordination with Other Trades
Power [NFPA 20, 9.2]
A normal source of power from a continually available source
Must be reliable
Dedicated source
Identifiable and remote disconnecting means
Coordination with Other Trades
Structural for tanks
Dead Load
Live
Wind
Snow
Overview of Fire Pumps and Water Storage Tanks Webinar
30Proprietary Presentation by Koffel Associates, Inc.
Coordination with Other Trades
Drainage [NFPA 20, 4.12.7]
Floors must be pitched for adequate drainage of escaping water away from critical equipment such as the pump, driver, controller, and so forth.
Must discharge to a frost-free location.
Fire Pump Design
Deficiencies
Corrosion and damage packing
Overview of Fire Pumps and Water Storage Tanks Webinar
31Proprietary Presentation by Koffel Associates, Inc.
Deficiencies
Parts of Packing
Deficiencies
Damaged packing and improper packing drainage
Deficiencies
Fire pump based not secure
Overview of Fire Pumps and Water Storage Tanks Webinar
32Proprietary Presentation by Koffel Associates, Inc.
Deficiencies
Fire pump is dirty
Deficiencies
Fire pump is dirty
Deficiencies
No drain for circulation relief valve
Overview of Fire Pumps and Water Storage Tanks Webinar
33Proprietary Presentation by Koffel Associates, Inc.
Deficiencies
Rock in impeller
Deficiencies
No service clearance for controller, 3 feet [NFPA 70]
Future Questions….
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Smoke Management
Proposed Changes to the IBC
Ask the Expert FAQ.Koffel.com
Overview of Fire Pumps and Water Storage Tanks Webinar
34Proprietary Presentation by Koffel Associates, Inc.
Thank You
M. Steven Welsh, P.E.Registered Fire Protection Engineer
www.koffel.com
410-750-2246
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Expertly Engineering Safety From Fire