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I am confused with incompressible and compressible flow.Can i use moody diagram for air compressor.How can i calculate pressure drop in pipe.

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- Thread starter noname91
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- #1

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I am confused with incompressible and compressible flow.Can i use moody diagram for air compressor.How can i calculate pressure drop in pipe.

- #2

SteamKing

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I don't know what you mean by 'Can I use moody diagram for air compressor?'

Crane Technical Paper 410 covers some simple compressible flows for air and other gases. It's worth laying your hands on a copy.

- #3

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I found a formula from atlas copco manual

p1-p2=(450*(q^1,85)*L)/((d^5)*p)

q=air flow (l/s)

d=internal pipe diameter(mm)

l=length of the pipe bar(a)

p=absolute initial pressure

atlas copco products air compressor.Can i use this formula to calculate pressure drop in pipeline?

p1-p2=(450*(q^1,85)*L)/((d^5)*p)

q=air flow (l/s)

d=internal pipe diameter(mm)

l=length of the pipe bar(a)

p=absolute initial pressure

atlas copco products air compressor.Can i use this formula to calculate pressure drop in pipeline?

Last edited:

- #4

SteamKing

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It's worth a shot. Remember, pressure is in units of bars.

- #5

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V=Q/A ---> V=4*(2,6/60)/(3,14*0,05^2)

V=22,08m/s MACH=22,08/340=0,064

Can i use incompressible flow equations(DARCY-WEİSBACH)?

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