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
: Standard for low-risk, lower-horsepower applications. api 688 pdf
Reciprocating machines experience highly variable torque during a single revolution. This variation can excite the torsional natural frequencies of the crankshaft and driver coupling. API 688 guides engineers through conducting a TVA to prevent catastrophic shaft failures. API 618 / API 674 Design Approaches Explained API 688 is comprehensive, covering various types of
By nightfall, there was a faint warmth in the housings that thermal imaging flagged as abnormal. Marta requested a borescope inspection. The feed line was shut down for a controlled check—protocol spelled it out: lockout, tagout, verify zero energy. Maintenance moved like a practiced crew, and a hush fell over the plant as everyone watched screens. Reciprocating PD Pumps (cross-referencing API 674)
API Technical Report 688 (API TR 688), titled Pulsation and Vibration Control in Positive Displacement Machinery Systems , explains how to apply pulsation design design criteria. It directly supports API 618 by providing theoretical background, practical examples, and analysis techniques.
and API 619) and various PD pumps (referencing API 674, 675, and 676). Key Focus:
: Utilizing a combination of choke tubes and bottles to act as low-pass filters for specific frequency bands. How to Utilize API 688 Documentation