Lube Oil Overhead Tank

An alternative to the coastdown pump approach is the overhead lube oil tank. It has the valuable feature of being motivated by gravity. If reasonably maintained, it should be one of the more reliable methods available, It will safely permit the coastdown of a compressor without losing the bearings due to lack of lubrication during power failure. Figure 8-12 shows two schemes for the tank arrangement. While both systems are in successful operation, the method at (b) requires less instrumentation and would be considered somewhat less prone to problems.

The tank should be placed at an elevation that provides a static head less than the low oil pressure trip switch setting so as to not interfere with the normal trip function. Normally this means that the static head should not be more than the equivalent of 5 psi. The minimum sizing should be based on a three-minute rundown cycle. Adding a bit more to the time is probably not all that costly.

For this tank, stainless steel should be specified considering its importance, and because it is elevated, it will not receive the inspection for main-

chilled check valve

TO EQUIPMENT

chilled check valve

TO EQUIPMENT

TO EQUIPMENT

a to reservoir 0« drain header

LUBE-OIL SUPPLY

TO EQUIPMENT

TO RESERVOIR OR DRAIN HEADER

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