Pulsation and Vibration Study Of Reciprocating Compressor According To API 618 5th Edition
Journal Title: International Journal of Modern Engineering Research (IJMER) - Year 2014, Vol 4, Issue 7
Abstract
The compressor package contains the reciprocating compressor, pulsation dampers, gas coolers and the connected pipe system which are often the heart of an installation and should be operate smoothly and reliably. The compressor piping vibrations can contribute to fatigue failure of the system or entire package which can lead to unsafe situations for human being as well as environment, loss of capacity and increase in maintenance as well as repair cost and to avoid this situation compressor piping vibration analysis to be carried out at a very early stage of the design of an installation. The pulsation analysis should be carried out before the piping vibration analysis. The guidelines for the pulsation analysis are given in API 618 Approach 2 and the guidelines for the vibration analysis are given in API 618 Approach 3. The original system layout is checked with respect to pulsations with all operating cases that are characterized by steady-state operating conditions. The different gas properties and operation cases are considered with valve unloading cases as operation cases. The measures are proposed to reduce pressure pulsation by installation of orifices. The shaking forces are used in the subsequent vibration study. After the analysis of pulsation results, find out the worst case for the vibration study means we used the shaking forces induced by pressure pulsation excite the mechanical piping system of worst case. The Vibration Study determines the effect on the mechanical piping system and proposes measures to avoid stresses possibly leading to deformation or rupture by fatigue. The finite element program ANSYS is used for modeling of the mechanical system. The model is built of several types of basic piping elements (e.g. pipes, beams, elbows, T-pieces) connected at node points. The modifications are proposed to meet agreed criteria of vibration. This paper demonstrated that by properly analysising the compressor piping vibration in an accurate and economic way using Pulsim and Ansys software. The accuracy of the analytical solution is validated by means of experimental results by using B & K Analyser for the measurement of compressor piping vibration.
Authors and Affiliations
Pradip P. Shejal , Dr. A. D. Desai
Keywords
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