HomeMy WebLinkAboutOWTS Pump Calcs Revised 07.21.2026Pump Selection for a Pressurized System - Single Family Residence Project
Parameters
Discharge Assembly Size
Transport Length
Transport Pipe Class
Transport Line Size
Distributing Valve Model
Max Elevation Lift
Manifold Length
Manifold Pipe Class
Manifold Pipe Size
Number of Laterals per Cell
Lateral Length
Lateral Pipe Class
Lateral Pipe Size
Orifice Size
Orifice Spacing
Residual Head
Flow Meter
'Add-on' Friction Losses
2.00
90
40
2.00
None
10
12
40
1.50
4
92
40
1.50
1/8
4
5
None
0
inches
feet
inches
feet
feet
inches
feet
inches
inches
feet
feet
inches
feet
Calculations
Minimum Flow Rate per Orifice
Number of Orifices per Zone
Total Flow Rate per Zone
Number of Laterals per Zone
% Flow Differential 1st/Last Orifice
Transport Velocity
0.43
96
41.8
4
2.3
4.0
gpm
gpm
%
fps
Frictional Head Losses
Loss through Discharge
Loss in Transport
Loss through Valve
Loss in Manifold
Loss in Laterals
Loss through Flowmeter
'Add-on' Friction Losses
3.5
2.6
0.0
0.3
0.3
0.0
0.0
feet
feet
feet
feet
feet
feet
feet
Pipe Volumes
Vol of Transport Line
Vol of Manifold
Vol of Laterals per Zone
Total Volume
15.7
1.3
38.9
55.9
gals
gals
gals
gals
Minimum Pump Requirements
Design Flow Rate
Total Dynamic Head
41.8
21.7
gpm
feet
0 40 80 120 160
0
10
20
30
40
50
60
70
Net Discharge (gpm)
PumpData
PFSW50 Sewage Pump
1/2HP, 115/230V 1Ø
Legend
System Curve:
Pump Curve:
Pump Optimal Range:
Operating Point:
Design Point: