is a technical report (TR) produced by the American Petroleum Institute. It serves as a comprehensive guide for engineers to minimize vibration and pulsation issues in systems using reciprocating compressors and pumps. Key Purpose of API 688 While standards like (reciprocating compressors) and
Disclaimer: This article is for informational purposes only. Always refer to the official API 688 PDF and consult with qualified engineering professionals for specific applications. Standards are subject to revision; verify current edition before use.
and API 619) and various PD pumps (referencing API 674, 675, and 676). Key Focus:
The adoption of the 2023 edition began in October 2023, and it is now considered the "active" version. The first edition (API RP 688:2012) is now and largely of historical interest, though it was reconfirmed in 2021.
The distinction between the first and second editions is crucial for anyone applying the document. api 688 pdf
API 688 was developed to address a gap between the pump design (API 610) and the seal design (API 682). Its primary purposes are:
The team added a side-branch resonator (Helmholtz absorber) designed precisely per API 688’s formulas. They also installed an intermediate pipe clamp with a vibration isolator. After modifications, pulsation dropped to 5%, and vibration velocity fell from 52 mm/s to 12 mm/s RMS. The compressor has operated for 5+ years without a recurrence.
Beyond initial plant design, the principles in the API 688 PDF are invaluable for troubleshooting existing field problems. When a facility experiences unexpected piping vibration, engineers reference API 688 to establish a diagnostic framework:
To protect your system assets, engineering teams rely heavily on —the premier global authority for pulsation and vibration control. is a technical report (TR) produced by the
Methodologies for dynamic analysis of pump and compressor valves. Relationship with API 618 API 688 acts as a supporting document to
API 688 is the global gold standard for preventing catastrophic fatigue failure caused by pressure pulsations in positive displacement pump piping systems. By understanding the three Design Approaches and applying acoustic and structural modeling techniques, plant designers can safeguard equipment reliability, protect field personnel, and minimize unplanned downtime.
API 688 is comprehensive, covering various types of PD machinery and their associated piping systems. The specific equipment addressed includes: (cross-referencing API 618). Rotary-type PD Compressors (cross-referencing API 619). Reciprocating PD Pumps (cross-referencing API 674). Controlled Volume PD Pumps (cross-referencing API 675). Rotary PD Pumps (cross-referencing API 676). Key Technical Objectives
API 688 provides the technical framework to prevent mechanical fatigue and structural damage caused by pressure fluctuations. It is primarily used alongside purchasing specifications like API 618 for reciprocating compressors. Reciprocating Compressors (API 618) Rotary PD Compressors (API 619) Reciprocating PD Pumps (API 674) Controlled Volume PD Pumps (API 675) Rotary PD Pumps (API 676) Always refer to the official API 688 PDF
The latest version, , includes Errata 1 (published March 2024) , which ensures the most up-to-date engineering practices are followed. Scope and Machinery Addressed
Finding the is the first step in designing, auditing, or troubleshooting safe and compliant compressor systems. Here is an in-depth breakdown of what this vital industry document covers, why it matters, and how you can obtain it. What is API 688?
, officially titled "Pulsation and Vibration Control in Positive Displacement Machinery – Reciprocating Compressors Systems," is a definitive guideline published by the American Petroleum Institute (API). It establishes minimum requirements for the analysis, measurement, and control of pulsation-induced vibrations in reciprocating compressor systems.