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Title: Specifying Reciprocating Machinery Pulsation And Vibration Requirements Per API-618
Author: Alexandar Lifson, John C. Dube
Source: American Gas Association 1987
Year Published: 1987
Abstract: This paper is intended as a guide that will allow a user to specify and enforce reciprocating machinery pulsation-induced vibration and stress control requirements per the API-618 Standard. Specific emphasis will be placed on the most common and comprehensive API-618 Third Edition, Design Approach 3. Recommendations are given on what type of technology must be available to the design services performing the study in order to design trouble free installations according to the API618 standard relevant quotations from this standard are presented to reinforce these recommendations. Description of required digital or analog simulation tools for performing forced dynamic piping response are reviewed, including prediction of resonant mode and frequencies, excitation forces and damping, and vibration and cyclic stresses. Results from field studies, laboratory tests, and computer simulations are presented to show how the inability to model accurately the flexibility properties of compressor cylindermanifold components (branch connections, crosshead-guide and distance piece, clamps, flanges, and baffles) can lead to erroneous results and potential equipment failures. Required component modeling techniques, which must be based on comprehensive laboratory testing or advanced analytical tools, for determining the flexibility characteristics of these components are also examined.

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