Maintenance Procedures for Centrifugal Pumps

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MIL-HDBK-1164

6.5.1

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

manufacturer's manuals.

6.5.1.1

Lubrication. General lubrication instructions are provided in par. 11.6.

Manufacturer's manuals cover lubrication frequency for special cases, but the following

generally applies.

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

points.

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

used.

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.

6.5.1.2

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,

temperature, and impurities

Amount of abrasive present