Friction Loses in pipe ASTM A106
Friction Loses in pipe ASTM A106
(OP)
Hi everybody!
I`m trying to calculate the total pressure drop in a steam pipe system. I`m pretending to use the bernoulli equation but when I see the part of friction loses equation, I saw that I require the Darcy Weisbach equations but as I have understood, this DW equation works with WATER and with some common and general materials. I`m trying to find out the pipe friction coefficient for ASTM A106 Gr B or other from ASME Secc II. (just pipe). And also I`m trying to find the resistance coefficient for fittings (in my case just elbows of 90 and 45 grades)....anyone can tell me where can I find this info?
Thanks!!!
RS
I`m trying to calculate the total pressure drop in a steam pipe system. I`m pretending to use the bernoulli equation but when I see the part of friction loses equation, I saw that I require the Darcy Weisbach equations but as I have understood, this DW equation works with WATER and with some common and general materials. I`m trying to find out the pipe friction coefficient for ASTM A106 Gr B or other from ASME Secc II. (just pipe). And also I`m trying to find the resistance coefficient for fittings (in my case just elbows of 90 and 45 grades)....anyone can tell me where can I find this info?
Thanks!!!
RS





RE: Friction Loses in pipe ASTM A106
You should invest in a copy of Crane Technical Paper 410. It is less expensive than most modest textbooks, but ten times the value.
RE: Friction Loses in pipe ASTM A106
RS
RE: Friction Loses in pipe ASTM A106
You could Google the Spirax-Sarco website and check out their methodologies, charts and on-line calculators. They are pretty reliable.
RE: Friction Loses in pipe ASTM A106
For steel pipe, I usually use the pretty typical 0.00015 feet for roughness. Fitting losses (elbows, tees, full open valves, reducers, etc) are typically handled in terms of L/D. There are lots of formulas for calculating the friction factor or you use the standard Moody diagram in Crane (if you don't have a copy and are doing to do hydraulics, get one yesterday).
There is also Fanning friction factor and a Moody friction factor. Be sure to know which friction factor your pressure drop correlation is based on if you start using different correlations from different references.
http://www.eng-tips.com/faqs.cfm?fid=1746
RE: Friction Loses in pipe ASTM A106
http://www.spiraxsarco.com/resources/steam-engineering-tutorials.asp
Especially this page,
http://www.spiraxsarco.com/resources/steam-engineering-tutorials/steam-distribution/pipes-and-pipe-sizing.asp
What would you be doing, if you knew that you could not fail?
RE: Friction Loses in pipe ASTM A106
Thanks again!!!