Page 133 - Practical Machinery Management for Process Plants Major Process Equipment Maintenance and Repair

116 Major Process Equipment Maintenance and Repair

Personnel

Maintenance personnel should be familiar with the basic principles of
vertical pumps and know how to handle the tools required for their main-
tenance and repair. Leading pump manufacturers have highly qualified
service engineers who can visit periodically and assist in the training and
updating of maintenance personnel with the latest techniques. Some man-
ufacturers also have service training centers where maintenance person-
nel can receive up-to-date instruction on vertical pump maintenance.

Spare Parts

Economical repair and maintenance procedures require adequate avail-
ability of the necessary spare parts. Pump repair parts are classified ac-
cording to anticipated use:

Level 1

parts requiredfor inspection of the pump during a scheduled shut-
down. This includes gaskets, O-rings, bearings, and packing or mechani-
cal seal.

Level 2
Parts replaced because of normaZ wear of the pump over a period of
time. During normal operation, pump wearing clearances open up, caus-
ing less efficient operation and higher susceptibility to failure. In addition
to this, wear rings and shaft sleeves are required.

Level 3
Brts reqz&edfor overhaul in the event of a pump failure include all
parts listed above plus a pump shaft and impellers. Stocking of a com-
plete bowl assembly will minimize pump downtime and allow for an or-
derly and economical repair.
In process plants, Level 3 stocking of spare pump parts is justified for
most vertical pumps. The general topic of spare parts is covered in Chap-
ter 5 of Volume 1 of this series.

Service Records

The topic of Maintenance Records is covered in Chapter 6 of Volume 1
of this series.