mechasmart

For Air normal conditions are 0°C, 1 atm, 0% humity... so sure there will be some change for level sea conditions, you can use a chart for it you can't find it

http://irc.nrc-cnrc.gc.ca/pubs/bsi/83-3_e.html

Thank you for your mail. This question arose because we are designing a system using a submersible air drven pump. This pump will be used on board an FPSO - Floating, production, storage and offloading vessel. The vendor of the pump states that it has an air consumption of x mtr3/hr. My boss wants to know whether this is measured at STP or NTP. Is it all that significant a matter?

Standard conditions are as Niloba said...

http://en.wikipedia.org/wiki/Standard_temperature_and_pressure

Where is your FPSO? If it is in the bay of Nigeria, then the difference between standard conditions of 0 C and the normal day time temp of 35 C is probably significant.

You can look at this article for more info on the conversion.

http://www.pdblowers.com/t6-scfm-standard-cfm-vs-acfm-actual-cfm.php