Page 63 - Subyek Teknik Mesin - Forsthoffers Best Practice Handbook for Rotating Machinery by William E Forsthoffer

Pump Best Practices Be st Practice 2.4

Fig 2.4.2 Single stage overhung pump (Courtesy of Union Pump Co.)

Single stage overhung pump

The single stage, overhung pump design shown in Figure 2.4.2 is
probably the most widely used in industry. Its construction in-
corporates an impeller fixed to a shaft, which has its center of
gravity located outside the bearing support system.

Single stage inline
This type of pump is finding increased usage in applications of
low head, flow and horsepower. Refer to Figure 2.4.3.
The advantage of this pump design is that it can be mounted
vertically (inline) between pipe flanges and does not require
a baseplate. A concrete, grouted, support plate is strongly
recommended, however. It should be noted that many inline

Fig 2.4.4 Integral gear centrifugal pump (Courtesy of Sunstrand Corp.)

designs do not incorporate bearings in the pump, and rely on
a rigid coupling to maintain pump and motor shaft alignment.
Acceptable pump shaft assembled runout with these types of
Fig 2.4.3 Single stage inline (Courtesy of Union Pump Co.) pumps should be limited to 0.001".

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