pipe minor loss coefficient
pipe minor loss coefficient
(OP)
when you guys do pressure pipe model, do you predefine the pipe minor loss coefficient?
I always use 1.5, no matter what pipe size, length. Today, when I read a report prepared by another engineering firm, they put 0.
what is you guys' suggestion?
I always use 1.5, no matter what pipe size, length. Today, when I read a report prepared by another engineering firm, they put 0.
what is you guys' suggestion?





RE: pipe minor loss coefficient
"Minor Loss Coefficients
Globe valve, fully open 10.0
Angle valve, fully open 5.0
Swing check valve, fully open 2.5
Gate valve, fully open 0.2
Short-radius elbow 0.9
Medium-radius elbow 0.8
Long-radius elbow 0.6
45 degree elbow 0.4
Closed return bend 2.2
Standard tee - flow through run 0.6
Standard tee - flow through branch 1.8
Square entrance 0.5
Exit 1.0 "
Just one guyses suggestion .
RE: pipe minor loss coefficient
I prefer to use the approach suggested by RWF7437 and include the losses for the actual fittings unless it is a very preliminary calculation and the details of the fittings are unknown - in which case I would agree with your 1.5 factor. And then when you have the details of the fittings you can revisit the calc and confirm the pressure drop.
Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com
RE: pipe minor loss coefficient
Calculate it or make a sound engineering assumption even if it is a very preliminary estimate.
RE: pipe minor loss coefficient
RE: pipe minor loss coefficient
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic (Note: Make that 99.99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: pipe minor loss coefficient
Tom
info@squirtonsite.com
RE: pipe minor loss coefficient
The main reason for my earlier post, re adding fudge factors. A minor loss dominated system would have a much different answer than a system with only a couple of minor losses - adding a "standard" fudge factor is a guess.
Calculate don't guess.