Section 3 • Installation
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Piping
The ideal load applied to flanges of the compressor unit is zero. However, it’s not practical to expect that no loads will be applied to unit connections. Thermal, dead, live, wind & seismic loads must be considered and even toler- ated. Well supported external piping connected to the compressor will still result in some loads applying forces and moments in three axes to unit flanges.
The most important issue is the
It must be noted that it is necessary to check for com- pressor shaft movement when the job is complete. In no case shall the attached piping be allowed to cause more than 0.002” movement at the compressor shaft. If more than 0.002” movement is detected the piping must be adjusted to reduce the compressor shaft move- ment to less than 0.002”. For example, the compressor shaft should not move more than 0.002” when piping is removed or connected to the compressor.
IMPORTANT – piping elements shall be supported per the requirements of ASME B31.5 / B31.3 as applicable. See guidelines below, particularly with concern to mini- mizing loads on check valves.
Header Piping and Drains
Header drains should also be installed to allow drainage of liquids from the discharge and suction headers. See Appendices for Recommended Header Piping.
CAUTION
Accumulated liquid in the suction header can damage the compressor if not drained. Always drain headers (suction and discharge headers) prior to
Remote Air Cooled Oil Cooler Piping
If equipped with a remote air cooled oil cooler, it is im- portant that the piping be installed correctly to and from the compressor unit and remote air cooled oil cooler. See Appendices for Recommended Air Cooled Oil Cooler Piping.
3 – 10 | VSG/VSSG • Installation, Operation and Maintenance Manual •Vilter/Emerson • 35391SSG |
