Hi,
I am new in the design field of E&I. One of the requirement is to calculate the 'Instrument Air Consumption' for Utility. Can someone give me guidelines of doing the same? I have got four Control Valves in our system. I do not have preliminary data for these valves otherwise I would have given more info. Valves are fitted in 4" pipe.

Thanks,
Control

 

The rule used to be 1 cfm per instrument.
These days instruments use less air but if you allow 1 cfm it should take care of any leaks.

Roy

 

First you need to make an assumption of how the instrument air will be consumed. Is it continues or intermittent? Then you need to know how much scfm per consumer. Then make the tabulation.

Found this website providing thorough guideline
http://instrumentationportal.com/2011/instrument-insight/