Query - Compressed air line sizing using nomograph
Query - Compressed air line sizing using nomograph
(OP)
Hello all,
I have one query for compressed air line sizing. Please find the attached file for quick calcs and summary of this post.
Problem
http://www.engineeri...ssure-d_36.html
A plant receives compressed air at 25Nm3/min and 7barg. Please size the line for compressed air intake. [Assumption: assume given nomograph is for the supply pressure of 7barg]
Query
What is the 'Free Air Flow (cfm)' in the Nomograph? Is it the flowrate at actual conditions [at 20deg C and 7barg] or standard conditions [15degC and atmospheric pressure]
If we select 3" pipe at actual flowrae of 119.92 cfm, the pressure drop is about 0.08psi/100ft
If we select 3" pipe at standard flowrae of 930.66scfm, the pressure drop is about 0.6psi/100ft
Regards,
KS
I have one query for compressed air line sizing. Please find the attached file for quick calcs and summary of this post.
Problem
http://www.engineeri...ssure-d_36.html
A plant receives compressed air at 25Nm3/min and 7barg. Please size the line for compressed air intake. [Assumption: assume given nomograph is for the supply pressure of 7barg]
Query
What is the 'Free Air Flow (cfm)' in the Nomograph? Is it the flowrate at actual conditions [at 20deg C and 7barg] or standard conditions [15degC and atmospheric pressure]
If we select 3" pipe at actual flowrae of 119.92 cfm, the pressure drop is about 0.08psi/100ft
If we select 3" pipe at standard flowrae of 930.66scfm, the pressure drop is about 0.6psi/100ft
Regards,
KS





RE: Query - Compressed air line sizing using nomograph
Good luck,
Latexman
Technically, the glass is always full - 1/2 air and 1/2 water.
RE: Query - Compressed air line sizing using nomograph
RE: Query - Compressed air line sizing using nomograph
The lines you have drawn on the nomograph are wrong. The 119.9 cfm line is drawn at about 280 cfm, and the 930 cfm is drawn at about 800 cfm. 119.9 cfm is not free air flow - it is the actual flow rate. You should be sizing for the 930 cfm of free air flow.
Katmar Software - AioFlo Pipe Hydraulics
http://katmarsoftware.com
"An undefined problem has an infinite number of solutions"
RE: Query - Compressed air line sizing using nomograph
Thanks for all your input and help.
Ooops!.. I got wrong values on x axis…
Thanks
KS