Flowserve LNGT - Manual (Page 25)

LNGT USER INSTRUCTIONS ENGLISH 00083107 02-08
Page 25 of 48
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Grease lubricated pumps and electric motors are
supplied pre-greased.
Other drivers and gearboxes, if appropriate, should
be lubricated in accordance with their manuals.
In the case of product lubricated
bearings the source of product supply should be
checked against the order. There may be
requirements for an external clean supply,
particular supply pressure or the commencement of
lubrication supply before pump start-up.
5.2 Pump lubricants
5.2.1 Recommended lubricants, fill quantities
See applicable tab in the User manual for
Lubrication relation table. See also
Supplementary User Instructions and/or refer to
section 3.4.2, Pump and impeller data
5.2.2 Lubrication schedule
5.2.2.1 Oil lubricated bearings
Normal oil change intervals are 4 000 operating
hours or at least every 6 months. 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
40 ºC [122 ºF].above ambient, but should not
exceed 80 ºC [176 ºF]. A continuously rising
temperature, or an abrupt rise, indicate a fault.
5.2.2.2 Grease lubricated bearings
When grease nipples are fitted, one charge between
grease changes is advisable for most operating
conditions, ie 2 000 hours interval.
Normal intervals between grease changes are 4 000
hours or at least every 6 months.
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 [204 °F]. For most operating conditions a
quality grease having a lithium soap base and NLGI
consistency of No 2 or No 3 is recommended. The
drop point should exceed 175 ºC [350 ºF].
Never mix greases containing
different bases, thickeners or additives.
5.3 Direction of rotation
Ensure the pump is given the same
rotation as the pump direction arrow cast on the
pump casing.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.
5.4 Guarding
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.
5.5 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.
5.5.1 Suction pressure above atmospheric
pressure
Open vent connection [1] on top of the pump upper
casing to allow the trapped air to escape. Let liquid
run out until free from air bubbles.