Page 110 - Practical Machinery Management for Process Plants Major Process Equipment Maintenance and Repair

Installation, Maintenance, and Repair of Wrrical Pumps 95

LOCATING PLUG
CAPSCREW PLUG BOWL
PLUG SIZE THREAD SHAFT
SIZE A B C D E SIZE
‘2 “16 1’2 1’4 JS 34” 14 RH ’%6 & 1“

I B i
BREAK ~LL snnw CORNERS
Figum 2-19. Dimensions for shaft locating plug.

BOTTOM CASE

COLLET
LOCATING
PLUG
CAP SCREW
2 114 LENGTH)

- -BOTTOM CASE
BEARING
SAND CAP
Figure 2-20. Shaft position for collet installation.

torque from the shaft to the impellers. They are quite satisfactory for
small process pumps, but should not be used for temperatures above
160°F.
To drive the collets into the impeller bores properly, the shaft should be
positioned firmly in the bottom case with a shaft locating plug and
capscrew.
1. Figure 2-19 shows typical dimensions for the shaft locating plug.
2. Figure 2-20 shows the assembly of the shaft locating plug into the
bottom case. The shaft is held in place by a 2% in. long capscrew
installed in the tapped hole at the bottom of the shaft. Prior to as-
sembly all parts including the collet driver must be inspected to be
sure that they are clean and free from nicb, burrs or scratches.