Flowserve LNN - Manual (Page 22)

LNN, LNNV, LNNC USER INSTRUCTIONS ENGLISH 71569074 06-14
Page 22 of 56
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5.2.3.2 Grease lubricated bearings
When grease nipples are fitted, one charge between
grease changes is advisable for most operating
conditions, i.e. 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 (99 ºF) above ambient but should not exceed
95
 C (204  F).
Special high temperature bearing arrangements
above 95
 C (204  F) should be checked against the
order.
For most operating conditions 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.
In member countries of the EU and EFTA, it is a legal
requirement that fasteners for guards must remain
captive in the guard to comply with the Machinery
Directive 2006/42/EC. When releasing such guards,
the fasteners must be unscrewed in an appropriate
way to ensure that the fasteners remain captive.
Whenever guarding is removed or disturbed ensure
that all the protective guards are securely refitted
prior to start-up.
5.2.4 Recommended fill quantities
Size
(LNN,
LNNV
and LNNC)
Top-up grease
g (oz)
Approx. oil
capacity,
both bearings
litre (fl. oz.)
Single row
ball bearing
Angular contact
thrust bearing
double
200-LNN-300
200-LNN-325
200-LNN-375
8 (0.28) 16 (0.56) 0.37 (12.5)
200-LNN-400
200-LNN-475
200-LNN-500
250-LNN-325
250-LNN-375
300-LNN-325
12 (0.42) 24 (0.84) 0.48 (16.2)
200-LNN-525
200-LNN-600
250-LNN-475
250-LNN-600
300-LNN-475
300-LNN-450
300-LNN-500
300-LNN-575
350-LNN-375
15 (0.53) 30 (1.06) 0.60 (20.3)
250-LNN-650
300-LNN-600
300-LNN-625
350-LNN-475
350-LNN-575
350-LNN-725
400-LNN-600
21 (0.74) 42 (1.48) 0.68 (23.0)
300-LNN-750
350-LNN-900
400-LNN-725
500-LNN-600
500-LNN-650
500-LNN-700
500-LNN-775
900-LNN-675
1000-LNN-750
34 (1.2) 68 (2.4) 2.00 (67.6)
400-LNN-800
400-LNN-875
400-LNN-900
400-LNN-925
500-LNN-950
600-LNN-750
600-LNN-950
600-LNN-975
1000-LNN-800
1000-LNN-825
46 (1.63) 92 (3.26) 4.50 (152)
500-LNN-1150
500-LNN-1250
600-LNN-1200
700-LNN-1100
700-LNN-1225
800-LNN-1125
900-LNN-1200
70 (2.48) 140 (4.96) 7.00 (237)
500-LNN-1000 81 (2.86) 162 (5.72) 4.50 (152)
Where the pump is lubricated by oil mist the
amount of oil mist supplied (m³/h) is normally
calculated to be at least the bearing bore diameter
(mm) x the number of bearing rows / 25. The oil mist
should consist of at least 0.025 - 0.04 % oil content.
Where oil mist is utilized to lubricate bearings the
pressure in the bearing housing must not exceed
0.01 bar (0.15 psi).