what is the maximum gas velocity in gas pipeline?
what is the maximum gas velocity in gas pipeline?
(OP)
Hello,
I want to know how to determine the maximum velocity in gas pipeline. Currently, I'm working under a project of gas distribution network of low pressure (< 4 bar)...
thanks
I want to know how to determine the maximum velocity in gas pipeline. Currently, I'm working under a project of gas distribution network of low pressure (< 4 bar)...
thanks





RE: what is the maximum gas velocity in gas pipeline?
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"An undefined problem has an infinite number of solutions"
RE: what is the maximum gas velocity in gas pipeline?
In Metric units, Vmax = [K/(rho)^0.5]
where K = 122, rho = density (kg/m^3), Vmax = velocity (m/s)
If you are carrying lots of sand or droplets consider K = 60.
Regards,
SNORGY.
RE: what is the maximum gas velocity in gas pipeline?
That number is for liquids.
HamazaHBA,
Maximum velocity in gas pipelines is an economic discussion, not a physical one. Higher velocities imply higher friction pressure-drops, so that requires more hp to recover lost pressure. Each project must do the balancing act between bigger pipe and more compression.
A lot of people use 100 ft/sec (or some totally arbitrary number in that range) as the design max for natural gas lines.
Pressures under 4 bar create problems that are new to Oil & Gas operations. Virtually every rule of thumb that people use for these decisions are pretty valid above 10 bar(a), between 4 bar(a) and 10 bar(a) they get progressively less precise, and below 4 bar(a) they are mostly useless.
Also, at your pressures make sure that you are using the isothermal gas flow equation (which you have to iterate on friction factor) instead of one of the closed form equations--none of the closed form equations are very close below 4 bar(a). Using AGA Fully Turbulent or Panhandle A to get to velocities at these pressures will lead you astray.
David
RE: what is the maximum gas velocity in gas pipeline?
We are more connected to everyone in the world than we've ever been before, except to the person sitting next to us. Lisa Gansky
RE: what is the maximum gas velocity in gas pipeline?
David
RE: what is the maximum gas velocity in gas pipeline?
http://www.standard.no/PageFiles/1134/P-001e5.pdf
RE: what is the maximum gas velocity in gas pipeline?
We are more connected to everyone in the world than we've ever been before, except to the person sitting next to us. Lisa Gansky
RE: what is the maximum gas velocity in gas pipeline?