Page 394 - Subyek Teknik Mesin - Forsthoffers Best Practice Handbook for Rotating Machinery by William E Forsthoffer

Lube, Seal and Control Oil System Best Practices Be st Practice 7.7

Fig 7.7.4a Rotary pump data sheet (Courtesy of The American Petroleum Institute)

system fluid at the required pressure and flow rate’. Let’s requirements and site data should be entered on a data
examine this functional definition in detail. sheet to ensure a correct selection of the pump. Again, each
‘To continuously supply’ means that the pump must be major component of the system must be treated the same
capable of uninterrupted operation for the same period of time as the critical equipment to ensure maximum system re-
as the critical equipment it is servicing. Critical equipment is liability. A typical rotary and centrifugal pump data sheet
designed for a minimum of three years’ operation between are included in Figures 7.7.4a to 7.7.5b for reference
scheduled shutdowns. In order to attain this reliability, the (please note that only 2 of 5 pages of Figure 7.7.5a and
pump and its unit components (coupling and driver) must be 7.7.5b are shown).
properly specified, selected and designed. In order to ensure reliable, trouble free operation, pump
As a first step, the equipment must be properly specified. mechanical seals are recommended instead of shaft packing.
The American Petroleum Institute specifications (API-614) A properly selected and installed pump mechanical seal in
provide a good basis for specifying highly reliable pumps and auxiliary system service can operate continuously for a three
steam turbine drivers. As previously stated, all equipment year period.

365