scope:

This standard covers the minimum requirements for constant-speed, packaged, general purpose, integrally-geared centrifugal air compressors, including their accessories for use in the petroleum, chemical, and gas industry services. This standard is not applicable to machines that develop a pressure rise of less than 0.35 bar (5.0 psi) above atmospheric pressure, which are classed as fans or blowers.

NOTE Special purpose and process applications, including Process Air Services, are covered by API 617.

Equipment covered by this standard is considered non-critical, usually spared and may be either of two classifications, basic or special duty. The purchaser shall specify which of the two classifications applies.

Basic packages are vendors' standard packages of proven design, and include minimal additional requirements.

Special duty packages are typically specified for installations that require higher availability, and include additional features and requirements.

Additional or overriding requirements applicable only to packages that have been specified as "Special Duty" are noted at the end of each section (see 6.12, 7.10, 8.5, D.2.5, and D.3.5.5).