Page 21 - Practical Machinery Management for Process Plants Major Process Equipment Maintenance and Repair

6 Major Process Equipment Maintenance and Repair

Style “B” consists of a horizontal pump mounted in vertical po-
sition with a special in-line casing and motor support. The motor is
mounted on top of the support and is connected to the pump with a flexi-
ble coupling that allows pull out of pump without disturbing the piping.
The advantage of this pump design is that radial and thrust conditions are
controlled by the pump bearings rather than the motor bearings. Also
some parts are interchangeable with horizontal models. Figure 1-4 shows
this style of pump.
Style “C” is the close-coupled design. The motor shaft is extended,
and the impeller and mechanical seal mounted on it (no separate pump
shaft needed). One disadvantage with this is that if anything goes wrong
with the seal or pump, it can also cause damage to the motor. This design

Figure 1-4. Vertical inline pump. Pump Figure 1-5. Vertical inline pump, close cou-
shaft is supported with its own independent pled design. Impeller and mechanical seal
bearings which also protect against radial are mounted on motor shaft.
thrust and shaft run-out. Source: Duriron
co.