Page 86 - Practical Machinery Management for Process Plants Major Process Equipment Maintenance and Repair

Installation, Maintenance, and Repair of Horizontal Pumps 71

unless otherwise specified for hot pumps.
13. Seal locking collar to shaft--.002 in. to .004 in. clearance.
14. Seal spring compression-% in. long springs = 56 in.
% in. long springs = 32 in. unless specified otherwise
K in. short springs = %6 in.
15. Rotating and stationary seal rings-sealing surface to be flat within
three light bands.
16. Heads, case, suction cover, bearing housing to case alignment fits-
.004 in. maximum clearance. Use dial indicator and feeler gauges to
ensure correct fit-up and alignment.

Horizontal Axial Split Case
1. Stationary parts to fit case metal to metal to .OM in. clearance.
2. Measure and inspect case fits for wear and corrosion. Repair by build-
ing up and re-machining.
3. All other repairs same as vertical radial split case pumps except: Case
rings to be bored in jig, not chucked.
4. Align element in case with feeler gauges and dial indicator. Dowel
bearing housing in place after aligning.
5. When cutting gasket for horizontal split pumps, cut bolt hole openings
on head and split gasket lengthwise. Cut the rest of the gasket on the
case with all the slack in the bolt holes pulled to the outside edges.
Leave stuffing box gasket length long, and trim after head has been set
in place and tightened.