oss commercial designer workshop...oss commercial designer workshop dose tank and effluent pumps...
TRANSCRIPT
![Page 1: OSS Commercial Designer Workshop...OSS Commercial Designer Workshop Dose Tank and Effluent Pumps Alice R. Quinn November 7, 2017 11/7/2017 1 30 minutes Systems with Pumps Subsurface](https://reader035.vdocuments.us/reader035/viewer/2022062601/5e535ff9b7ec327bb759ef81/html5/thumbnails/1.jpg)
OSS Commercial Designer Workshop
Dose Tank and Effluent Pumps
Alice R. QuinnNovember 7, 2017
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Systems with Pumps
Subsurface TrenchFlood Dosed
Subsurface TrenchPressure Distribution
Elevated Sand MoundPressure Distribution
1
3
2
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Dosing Tank: Material and Design specs
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Manufacturer Materials Capacity Connectors Gallon per inch* Access for service Components
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Dose Tank Cross section view Gal/in or gal/ft Manufacturer Working capacity Maximum bury depth (if >2’, manuf. statement)
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Dose Tank Cross Section
Effluent Pump
Pipe Connector
Pipe Connector
Riser to grade
Secured LidChildproof Plug
Floats with elevations
Quick Disconnect
Guide Rails (if necessary)
Lifting Rope or Chain
Tank size and manufacturer
Capacity
Sections 70, 71 and 73
Pump and Alarm on separate circuits
NEMA 4X Junction Box
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Alarm
Visible / Audible Separate circuit
from pump Location?
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Floats/controls/junction box Liquid level sensors are only controls
allowed in the dosing tank. NEMA 4X box junction box◦ Not in the tank◦ Installed in riser?◦ Optimally outside the tank and riser
Control box
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Required dosing tank capacity
= P + D + F
Tank inlet
Discharge line –typically 2” in the tankFloat Tree
(optional)
Pump pedestal
Quick Disconnect
Effluent Pump
P - Keep pump submerged
D - Dose volume plus drainback (if EFM drains to tank)
A - High water alarm
Tank Capacityin gal/in
R – Reserve Capacity
Tank Capacity
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Dose Tank CapacityKeep the pump submerged…
18”
Tank Capacity20.5 gal/in
369 gal11/7/2017 9
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Dose Tank CapacityTotal Dose = Dose to SAF + Drainback
18”369 gal
Tank Capacity20.5 gal/in
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Dose Volume Dose to soil absorption field
Drainback◦ Length of pipe X gallons/inch
Flood dosed 1 DDF
Subsurface trench pressure distribution
1 DDF or ¼ DDFDependent upon SLR
Elevated sand mound pressure distribution ¼ DDF
Sand lined system Dependent upon product used (1/3, 1/6, 1 DDF)
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Dose Tank CapacityTotal Dose = Dose to SAF + Drainback
18”369 gal
478 gal
450 gal 28 gal
Tank Capacity20.5 gal/in
23.3”
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Dose Tank CapacityHigh Water Alarm
18”369 gal
478 gal
Tank Capacity20.5 gal/in
123 gal
23.3”
6”
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Dose Tank CapacityReserve Capacity
18”
23.3”
369 gal
478 gal
Tank Capacity20.5 gal/in
6” 123 gal
47.3”48.8”
1.5”30 gal
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Lag Float
OFF
LAGALARMON
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Dose Tank CapacityLag Float
18”
Tank Capacity20.5 gal/in
4”LAG
ALARM
OFF
ON
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Dose Tank CapacityLag Float
18”
Tank Capacity20.5 gal/in
4”4”LAG
ALARM
OFF
ON
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Dose Tank Sizing
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Gallons/inch
Drainback VolDose Volume
Invert of inlet
Tank FloorPump Height
Inches between floats
Float Settings
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Effluent Pump
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Section 73 of the rule Effluent pump◦ Not a grinder or sump pump◦ Sewage pump?
Pump must fit the system◦ Flow◦ Total Dynamic Head
Multiple pumps required for DDF over 750 gpd
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Design FlexibilityMultiple Pumps Common Force Main◦ Dose volume = 1 DDF
Separate Force Main◦ Dose volume = 1/X DDF to each SAF
Where X = the number of SAFs designed11/7/2017 20
Pump 2 Pump 1
Pump A
Pump B
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Sizing the Effluent PumpSystem flow Flood Dosed
Pressure DistributionTotal number
of perforationsPerforation
Discharge RateXPerforation Discharge Rate is dependent upon residual head required
3’ residual head – 1.28 gpm per ¼” hole2.5’ residual head – 1.17 gpm per ¼” hole
Pump run time 10-15 minutes
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Flood Dosed(or pump assisted)
Static Head◦ Pump off to highest
elevation
Friction Loss◦ Length, diameter of
effluent force main◦ Equivalent length of
fittings◦ Other?
Pressure Distribution(subsurface or elevated)
Static Head◦ Pump off to highest elev.
Friction Loss◦ Length, diameter of EFM◦ Fittings◦ Other?
Residual Head◦ ESM – 3’◦ Sub PD – 2.5’ or 3’
Total Dynamic Head
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Residual Pressure
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Friction Loss
Velocity 2-5 fps Equivalent Length of pipe
for fittings Effluent force main must
drain, unless installed below the frost line.
Table X
Table XI
Table IX11/7/2017 24
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Pump Curve
PlotTDHFlow Design Point Operating Point
Design Point
Operating Point
36 gpm
17 ft
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Pump Curves and System Curves
The point of intersection of the two curves is where the pump will operate in the system.
Hea
d
Flow
The pump performs most efficiently in the middle 1/3 of the performance curve
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Pump Curves and System CurvesH
ead
Flow
The pump needs to work efficiently within the parameters required by the system
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Pump Curves and System CurvesH
ead
Flow
Modification of the system design
Increasing static head
Static head
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Pump Curves and System CurvesH
ead
Flow
Modification of the system design
Increasing static head
Static head
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Pump Curves and System CurvesH
ead
Flow
Modification of the system design
Increasing friction loss
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Pump Curves and System CurvesH
ead
Flow
Modification of the system designIncreasing friction loss
Decrease effluent force main diameter
Increase length of effluent force main or number of fittings
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Pump Sizing Tools
Manufacturer’s Pump Sizing Spreadsheets St. Joseph County Pump Sizing
Spreadsheets Sewage and Sump Pump Manufacturer’s
Association (SSPMA) IEHA Wastewater Management
Committee guidance document and worksheets
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Guidance Documents and Worksheets• Product of IEHA WWMC • Guidance Documents
– Effluent pump sizing (pg 1-6)– Dose tank sizing (pg 8)
• Worksheets– Effluent Pump (pg 7)– Dose Tank (pg 9)
• Available on the website (www.iehaind.org)• Based on requirements of 410 IAC 6-8.3• Incorporates best practices• Sizing must be compliant with the rule and any
local ordinances.11/7/2017 33
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IEHA WWMC guidance
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IEHA WWMC guidance
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Flood Dosed Example
http://www.stjosephcountyindiana.com/departments/sjchd/spreadsheets.htm
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St. Joseph pump spreadsheet
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St. Joseph pump spreadsheet
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St. Joseph pump spreadsheet
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St. Joseph pump spreadsheet
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St. Joseph pump spreadsheet
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St. Joseph pump spreadsheetPros
7 Brands of pumps plus custom pump entry
Easily compare different models or manufacturers
Checks for code compliance Additional Engineering
checks Points out errors and
provides tips to correct Videos, help tabs, and visual
aids
Concerns No wiggle room
(pressure distribution systems)
3 spreadsheets for 3 types of systems◦ Flood dose◦ Pressure Trench◦ Elevated sand mound
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Example 2
ESM
www.clarusenvironmental.comDesign ToolsSystem and Pump Curve Generator
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Clarus / Zoeller Pump Curve Generator
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Clarus / Zoeller Pump Curve Generator
Weep HoleAdd-in FrictionMultizone ValvePressure Filter
System TypeResidual HeadOrifice size and number
Hazen-Williams C FactorLateral Design Mode 11/7/2017 47
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Flow deviation along lateral
8.7%
For flow deviations between 5% and 10%, consult local code for acceptability. Less than 5% is ideal.
Lateral Design Mode
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Clarus / Zoeller Pump Curve Generator
Pick the pump(s)
Design Point Zoom In
Project Info and Notes
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Clarus / Zoeller Pump Curve Generator
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Clarus / Zoeller Pump Curve GeneratorPros
Multiple force main sizes Easily compare 4 different pumps Adds in losses for weep hole Variable Hazen-Williams C
factor Checks flow deviation along
lateral Entry for “wiggle” room 1 spreadsheet for multiple
system types Allows for use of other
discharge assemblies (Spider valve, multizone valve, etc.)
Concerns Only 2 brands of
pumps (Clarus and Zoeller)
Does not check velocity
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Resources
www.clarusenvironmental.comDesign ToolsSystem and Pump Curve Generator
http://www.stjosephcountyindiana.com/departments/sjchd/spreadsheets.htm
www.iehaind.orgIndiana Environmental Health AssociationWastewater Management Committee
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