Piping friction loss Calculator.
This Little program will calculate for
you the friction loss through a pipe using the popular Darcy-Weisbach
equation :
hf = f * ( L / D) * (V2 / 2 * g).
In order to calculate the minor losses
(fittings) you must add the corresponding Km values from the table below
, and enter them in the Km textbox of applet.
The value of friction factor f
is calculated using the colebrook equation , and can be checked using
the Moody diagram.
| Fitting |
Km |
| Globe valve, fully
open |
10.00 |
| Angle valve, fully
open |
2.00 |
| Gate valve, fully
open |
0.15 |
| Gate valve, 1/2
closed |
2.10 |
| Swing check valve
, flow |
2.00 |
| Elbow 90o
- flanged |
0.30 |
| Elbow 90o
- threaded |
1.50 |
| Long radius 90°,
flanged |
0.20 |
| Long radius 90°,
threaded |
0.70 |
| Elbow 45°,
threaded |
0.40 |
| Tee , Line flow,
flanged |
0.20 |
| Tee , Line flow,
threaded |
0.90 |
| Tee , Branch flow,
flanged |
1.00 |
| Tee , Branch flow,
threaded |
2.00 |
| Piping Entry &
Exit |
1.00 |
If you need more accurate values from
these for the calculation of minor loss coefficients, you can use the
following diagrams.
Globe,
angle, foot valve ζ values
Butterfly, swing
and flap valves
Gate and niddle
valves - inlets
Outlets and
bends
Tees
You may also download a moody diagram here.
Before
using the calculators
please read the Copyright and Disclaimer Notice.
