API Standard 619 specifies requirements for dry and oil-flooded, helical-lobe rotary compressors used for vacuum or pressure or both in petroleum, petrochemical, and gas industry services. It is intended for compressors that are in special-purpose applications.

It is not applicable to general-purpose air compressors, liquid-ring compressors, or vane-type compressors.

This edition of Std 619 is the identical national adoption of ISO 10440-1:2007, Petroleum, petrochemical and natural gas industries-Rotary-type positive displacement compressors-Part 1: Process Compressors