API STD 672 pdf download.Packaged, Integrally Geared Centrifugal Air Compressors for Petroleum, Chemical, and Gas Industry Services 1 Scope 1.1 This standard covers the minimum requirements for constant-speed, packaged, general purpose integrally geared centrifu- gal air compressors, including their accessories. This standard is not applicable to machines that develop a pressure rise of less than 0.35 bar (5.0 psi) above...