Page 61 - Practical Machinery Management for Process Plants Major Process Equipment Maintenance and Repair

46 Major Process Equipment Maintenance and Repair

6. Insert sleeve key, tighten sleeve nut with spanner wrench and lock
sleeve nut in place with socket head set screw.
7. Bolt seal gland into place.
8. Reassemble bearing housing.
9. Verify that shaft is free to rotate and does not bind.
10. Follow detailed start-up instructions.

Casing Disassembly
The pump shown in Figure 1-16 is built in two basic casing arrange-
ments: *

1. Top Suction: Top discharge, centerline supported for hot applica-
tions.
2. Side Suction: Side discharge, foot mounted for general applica-
tions.

Both arrangements incorporate heavy supports to carry pipe strain and
protect the casing from distortion. To reduce the radial load on the impel-
ler and to obtain added strength, all sizes have double volute casings.
Confined spiral-wound gaskets are provided between casing and casing
cover. These gaskets not only ensure positive sealing to the atmosphere,
but also positively seal the discharge from the suction passages to elimi-
nate casing wash-out at this point. Metal-to-metal contact between casing
and cover assures positive alignment and eliminates the need for feeler
gauges or other checking devices.
If it becomes necessary to disassemble the complete rotating element,
the following procedure can be followed:

1. Dismantle inboard bearing housing
2. Dismantle inboard stuffing box
3. Unbolt casing cover and with help from jack bolts remove remain-
ing rotating assembly. Nore: This assembly is very heavy and
mechanical lifting devices are necessary. The eye bolt is not at the
center of gravity and care must be exercised to balance the total un-
balanced weight.
4. While taking the assembly to a different work area, support the
coupling end of the shaft at all times.
5. Clamp the cover flange in a vise and again support the free end of
the shaft.
6. Disconnect the thrust bearing housing and the stuffing box.

* Union@ Pump Class "HOL"