November 2018 Reciprocating Compressor Piping

PIPING NOTES FOR RECIPROCATING COMPRESSORS

After piping engineers understand the line flow, satisfy process requirements and know which line requires measures against vibration and thermal stress, in advance, they should arrange lines in detail and plan piping supports.

Nozzle Orientation

As in the case of other rotary machinery, the installation point of each nozzle is automatically fixed from type and constructional viewpoints. Therefore, the manufacturer fixes the nozzle orientation, unless otherwise instructed.

Suction Piping

Piping arrangement on sleepers facilitates the installation of supports from the ground, which becomes advantageous for vibration-proofing measures. Also, the location of valves, instruments, etc. should consider convenience of operators and maintenance personnel.

Valve Layout

A suction valve is operated in connection with the operation of the startup and shutdown of the compressor. It is therefore preferable to lay out the valve as close to the compressor as possible.

Strainer

Fine mesh screens are generally used for the suction-line strainers in the process compressor during the initial startup operation. Also, it is preferable to install the strainer as close to the compressor nozzle as possible.

Discharge Piping

The discharge-piping route should be planned, bearing in mind the concurrent action of piping vibration due to liquid pulsation and piping stress due to piping thermal expansion arising from compressed heat. Piping arrangement should be configured to reduce vibration.

Support Plan

The placement of supports must be arranged to minimize vibration and eliminate any resonance being set up in the piping.