Flowserve MN - Manual (Page 26)

MN USER INSTRUCTIONS ENGLISH 71569189 11/04
Page 26 of 49
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5.2.7 Oil and grease change schedule
5.2.7.1 Oil lubricated bearings
Flowserve recommends an oil change interval of
approximately 8000 hours or 12 months, whichever
occurs first. For pumps on hot service or in severely
damp or corrosive atmosphere, the oil will require
changing more frequently. Lubricant and bearing
temperature analysis can be useful in optimizing
lubricant change intervals.
The lubricating oil should be a high quality mineral oil
having foam inhibitors. Synthetic oils may also be
used if checks show that the rubber oil seals will not
be adversely affected.
The bearing temperature may be allowed to rise to
50 ºC (122 ºF) above the ambient, but should not
exceed 82 ºC (180 ºF).
A continuously rising temperature, or
an abrupt rise is an indication of potential failure.
TIME
TE
M
P
E
R
A
TU
R
E
5.2.7.2 Grease lubricated bearings
See section 5.2.6.2 for frequency of lubrication in
hours. The characteristics of the installation and
severity of service will determine the frequency of
lubrication.
Lubricant and bearing temperature analysis can be
useful in optimizing lubricant change intervals.
The bearing temperature may be allowed to rise
to 55 ºC (131 ºF) above ambient but should not
exceed 95 ° C (203 ° F). For most operating conditions
a quality grease having a lithium soap base and NLGI
consistency of No 2 is recommended. The drop point
should exceed 175 ºC (350 ºF).
See table 5.2.6.1 for recommended grease lubricants.
Never mix greases containing different
bases, thickeners or additives.
5.3 Impeller clearance
(See section 6.1.6)
5.4 Direction of rotation
Ensure the pump is given the same
rotation as the pump direction arrow cast on the
pump casing/driver.
To avoid dry running, the pump must either be filled
with liquid or have the flexible coupling disconnected
before driver is switched on.
If maintenance work has been carried
out to the site's electricity supply, the direction of
rotation should be re-checked as above, in case the
supply phasing has been altered.
5.5 Guarding
In most cases guarding is supplied fitted to the
pump set. If this has been removed or disturbed
ensure that all the protective guards around the pump
coupling and exposed parts of the shaft are securely
fixed.
COUPLING GUARD
5.6 Priming and auxiliary supplies
Ensure all electrical, hydraulic,
pneumatic, sealant and lubrication systems (as
applicable) are connected and operational.
Ensure the inlet pipe and pump casing
are completely full of liquid before starting continuous
duty operation.
Do not run the pump dry!