Page 90 - Practical Machinery Management for Process Plants Major Process Equipment Maintenance and Repair

Installation, Maintenance, and Repair of Vertical Pumps 75

HOLLOWSHAFT MOTOR-,

DISCHAROE HEAD-. - I

BASE PLATE-
HEAD SHAFT-
LINE SHAFT COUPLIN-
LINE SHAFT-
LINE SHAFT BEARINQ-
OUTER COLUMN--,
INNER COLUMN-,
PUMP SHAFT-,
TOP CASE-,
SERIES CASE-,
SERIES CASE BEARINQ
COLLET

IMPELLER-,
BOTTOM CASE
BOTTOM CASE BEARINQ
STRAINER BODY-.

Figure 2-4. Deepwell pump. (Courtesy Byron Jackson Pump Division, Borg-Warner Indus-
trial Products, Inc.)

Solid Shaft Drivers

Solid shaft drivers are used to drive pumps with relatively short shafts,
less than 30 to 50 ft long. They therefore are used to drive almost all
process pumps and circulators. They provide more positive shaft align-
ment which is especially important when the pumps have mechanical
seals rather than packing. However, when a solid shaft driver is used, the
axial adjustment of the pump rotor is limited by the height of the adjust-
ing plate in the three-piece or four-piece coupling. The maximum axial
adjustment is generally 1/2 to 3/4 in. Thrust bearings normally will carry
either downthrust or upthrust. The construction of a solid shaft motor is
shown in Figure 2-6.