Maintenance Procedures for Centrifugal Pumps. The following
paragraphs describe general maintenance procedures for all types of horizontal and
vertical centrifugal pumps. For details of procedures that apply specifically to volute,
diffuser, regenerative-turbine, split-case, and multistage design, consult the
Lubrication. General lubrication instructions are provided in par. 11.6.
Manufacturer's manuals cover lubrication frequency for special cases, but the following
Caution: Do not lubricate totally enclosed equipment or insufficiently
guarded equipment while it is moving.
To avoid errors, establish a marking system to make sure that the
proper lubricant is used. Make sure the same product symbol and identifying color are
marked on lubricant containers, lubricant applicators, and locations near lubrication
Never over lubricate. Over lubrication causes antifriction bearings
to overheat and may damage the grease seals. Over lubrication may also damage
electric motor windings.
For simplified operation, provide the same type of grease gun
fitting (zerk) at all points using the same type of grease. The fewer the types of grease
used, the fewer grease guns required and the less likelihood of improper grease being
Table 14 provides a general lubrication schedule for centrifugal-
type pumps. When hand oilers are used to lubricate the shaft bearings, check the
settings daily and adjust them according to Table 15.
Packing. Selection of packing is usually done in accordance with the
manufacturer's recommendations or assistance. For pumping water, packing types
include non-reinforced woven or braided cotton asbestos, semi-metallic plastic, or a
combination of the two. If you require the manufacturer's assistance to select packing,
supply detailed information to the manufacturer on the following items:
Description of liquid handled, including percentage concentration,
Amount of abrasive present