Page 89 - Practical Machinery Management for Process Plants Major Process Equipment Maintenance and Repair

74 Major Process Equipment Maintenance and Repair

COUPLING

DISCHARGE HEAD-

COLUMN BEARIN

COLUMN SHAF
COUPLING
PUMP SHAFT

CASE- G?

I
IMPELLER Y
IMPELLER CASE-
SUCl ION BELL BEARING-
SUCTION BELL\A

Figure 2-3. Vertical circulating pump. (Courtesy Byron Jackson Pump Division, Borg-
Warner Industrial Products, Inc.)

ter table and water supply permits. Submersible pumps as illustrated in
Figure 2-5 supply makeup and utility water from wells that are either too
deep for reliable operation of deepwell pumps with line shafts or in loca-
tions that for environmental reasons require underground discharge in-
stallations. They also are used where motor noise would be a problem,
and in locations subject to flooding.

Types of Drivers

Most vertical pumps in process plants are driven by vertical electric
motors. The process pumps often have spares, driven by vertical steam
turbines. Pumps driven through right angle gears by horizontal electric
motors, steam turbines, or internal combustion engines are less common.