Compressed Natural Gas Flow Problem
Compressed Natural Gas Flow Problem
(OP)
Hello gas flow gurus out there. I have a customer who wants to test engines on compressed natural gas. He has a demand flowrate of 42 scfm at 10 psig. If he intends on using 101 liter gas cylinders at 3200 psig, how long will it take for one cylinder to be exhausted at this engine flowrate? Thanks in advance for your time.





RE: Compressed Natural Gas Flow Problem
The answer is in the attachment.
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"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Compressed Natural Gas Flow Problem
Bauer Compressor makes these.
We placed one on a college which was focusing on eduction pertaining to alternate fuels.
RE: Compressed Natural Gas Flow Problem
Cheers,
joe
RE: Compressed Natural Gas Flow Problem
I couldn't figure out your conversion factors so I put the problem into MathCAD and just let it deal with all the conversions. Got the same answer. Even when I was doing this stuff on a slide rule I would have done it with rigerous units:
t = 101 L * (m^3/1000 L) (3.2808 m/ft)^3 * (3200 psi + 15 psi)/(10 psi + 15 pai) / (42 ft^3/min) = 10.921 min
Jrobinson1,
Probably need bigger cylinders, more cylinders, or a compressor. For industrial users, the gas company will put a "high pressure" meter and supply you with 10 psig gas without doing any of this.
David
RE: Compressed Natural Gas Flow Problem
I figured he's doing something that needs mobility and only small cylinders fit onboard = no compressor station, no utility connection.
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Compressed Natural Gas Flow Problem
David
RE: Compressed Natural Gas Flow Problem
Hope the Turkey is defrosted by now. Happy Thx_d!
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Compressed Natural Gas Flow Problem
Happy Turkey Day!
joe