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Correction: The standard explicitly covers Reciprocating Compressors AND Positive Displacement Pumps. Plunger pumps are notorious for high-frequency pulsation that destroys chemical injection systems.

: Offers protocols for validating design results and troubleshooting existing vibration problems in the field. Machinery Specifics api 688 pdf

Free PDFs found on file-sharing sites are likely unofficial, outdated (pre-2014 draft), or incomplete. API updates RPs every 5–8 years; ensure you have the First Edition (2014) or later . outdated (pre-2014 draft)