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The table of relative magnitudes process equipment and piping in NFPA 497 the flow is refered to liquid or gas phase?

Question asked by janexho on May 5, 2017

The table of "relative magnitudes process equipment and piping..." in NFPA 497 show small limits for 

flow rate variable, this flow rate is refered to a liquid phase? gas phase? or both.

Probably a typical industrial small pipe (2") at 20 m/s will become "High" (large) to area classification.