Flow Loss Calculator
Flow Velocity & Friction Headloss
(
En español
)
Data Collection
Pipe Diameter:
1/2
3/4
1
1¼
1½
2
2½
3
4
5
6
8
This calculator generates information on the friction head loss of various piping, sizes, materials and flow rates used in water distribution systems. It offers several standard commercial sizes of pipes, although all combinations of pipe material, Schedule or SDR may NOT be valid! •• Basis of calculations: •• The values calculated are based on NOMINAL pipe dimensions and the Williams-Hazen formula, shown below and published by the Plastic Pipe Institute TR14 March 1971 •• Water velocity: •• In general, flow velocity *LESS* than 5 feet per second, is considered to be *SAFE*. Higher velocities may be used in cases where the operating characteristics of valves and pumps are known so that sudden changes in flow velocity can be controlled. %%%%%%%%%%%%%%%%%%%%%%%%%%% The intent of this calculator is to assist in informing users, engineers and others. Interpretation, use, and application is a function and responsibility of the user.
Pipe Schedule/SDR:
SDR 32.5
SDR 26
SDR 21
SDR 17
SDR 13.5
Schedule 40
Schedule 80
Pipe Material:
PVC
HDPE (IPS)
ABS
Type K Copper
Brass Pipe
Steel (new)
Cast Iron (new)
Cast Iron (5yr. old)
Cast Iron (30yr. old)
Galvanized Steel
Wrought Iron (new)
Flow Rate: (GPM)
{q}
Pipe Run Length: (ft)
Pipe Inside Diameter:
{d}
(inches)
Wall Thickness:
(inches)
Roughness Coefficient:
{C}
Hazen-Williams
Flow Velocity:
(ft/sec)
v = (q
0.408709
/d
2
)
Friction Head loss:
(ft/100 feet)
f = .2083 x (100/C)
1.852
x (q
1.852
/d
4.8655
)
System Pressure loss:
(psi)
© 2002 LASCO
Fittings, Inc.
ver 1.2.1 9/05
Copyright © 2010 Lasco Fittings, Inc. All rights reserved.
