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ASME PTC 9 Performance Test Code for Displacement Compressors, Vacuum Pumps, and Blowers . First established in 1915, the current version is ASME PTC 9-1970 (reaffirmed in 1997)

Offers PDFs of the 1979 edition for viewing, which can be useful for research and understanding historical procedures. Key Aspects of the Code

Specifies required instruments and techniques for gathering data.

Since it is no longer an active American National Standard, official "best" copies are primarily found through digital archives or professional society libraries: Official ASME Store : You can purchase the historical version of

If you work with reciprocating or rotary displacement compressors, you know the name: . Formally titled “Performance Test Code on Displacement Compressors,” this standard is the gold standard for conducting accurate, repeatable, and reliable performance tests.