Flowserve PolyChem GRP - Manual (Page 38)

USER INSTRUCTIONS POLYCHEM GRP ENGLISH 71569132 12-04A
Page 38 of 52
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6.9 Examination of parts
6.9.1 Cleaning/inspection
All parts should now be thoroughly cleaned and
inspected. New bearings, O-rings, gaskets, and lip
seals should be used. Any parts that show wear or
corrosion should be replaced with new genuine
Flowserve parts.
It is important that only non-
flammable, non-contaminated cleaning fluids are
used. These fluids must comply with plant safety and
environmental guidelines. Aggressive solvents may
damage the GRP material.
6.9.2 Critical measurements and tolerances
To maximize reliability of pumps, it is important that
certain parameters and dimensions are measured
and maintained within specified tolerances. It is
important that all parts be checked. Any parts that do
not conform to the specifications should be replaced
with new Flowserve parts.
6.9.3 Parameters that should be checked by users
Flowserve recommends that the user check the
measurements and tolerances in figure 6-19
whenever pump maintenance is performed. Each of
these measurements is described in more detail on
the following pages.
6.9.4 Additional parameters checked by
Flowserve
The parameters listed below are somewhat more
difficult to measure and or may require specialized
equipment. For this reason, they are not typically
checked by our customers, although they are
monitored by Flowserve during the manufacturing
and or design process.
6.9.4.1 Shaft and sleeve (if fitted)
Replace if grooved, pitted or worn. Prior to mounting
bearings or installing the shaft into the bearing
housing, check the following parameters.
Diameter/tolerance, under bearings
In order to ensure proper fit between the shaft and
bearings, verify that both the inboard (IB) and
outboard (OB) shaft diameter is consistently within
the minimum/maximum values shown in figure 6-20.
A micrometer should be used to check these outside
diameter (OD) dimensions on the shaft.
6.9.4.2 Bearings
It is recommended that bearings not be re-used after
removal from the shaft. Prior to mounting bearings,
check the following parameters.
Figure 6-19
Topic
ASME
B73.5M
Standard
mm (in.) Suggested
by major
seal vendors
mm (in.) Suggested and
or provided by
Flowserve
mm (in.)
Shaft
Diameter tolerance,
under bearings N.S. 0.005 (0.0002)
Impeller
Balance See note 1
Bearing housing
Diameter (ID) tolerance
at bearings N.S. 0.013 (0.0005)
Power end assembly
Shaft runout
Shaft sleeve runout
Radial deflection - static
Shaft endplay 0.05 (0.002)
0.05 (0.002)
N.S.
N.S.
0.03 (0.001)
0.05 (0.002)
0.076 (0.003)
0.05 (0.002)
0.05 (0.002)
0.05 (0.002)
0.05 (0.002)
Seal chamber
Face squareness to shaft
Register concentricity 0.08 (0.003) 0.03 (0.001)
0.13 (0.005) 0.08 (0.003)
0.13 (0.005)
Complete pump
Shaft movement caused by
pipe strain
Alignment
Vibration at bearing housing
N.S.
N.S.
See note3
0.05 (0.002) 0.05 (0.002)
See note 2
See note 3
N.S. = not specified.
Notes.
1) The maximum values of acceptable unbalance are:
1 500 r/min: 40 g•mm/kg (1 800 r/min: 0.021 oz•in./lb.) of mass.
2 900
r/min: 20 g•mm/kg (3 600 r/min: 0.011 oz•in./lb.) of mass.
The PolyChem GRP impellers conform to the ISO 1940 Grade
6.3 tolerance criteria as molded and do not require balancing.
2) The ASME B73.5M standard does not specify a recommended
level of alignment. Flowserve recommends that the pump and
motor shafts be aligned to within 0.05 mm (0.002 in.) parallel FIM
(full indicator movement) and 0.0005 mm/mm (0.0005 in./in.)
angular FIM. Closer alignment will extend MTBPM. For a detailed
discussion of this subject see the Alignment section of this manual.
3) The ASME B73.5M, paragraph 5.1.3.
Figure 6-20
Group 1 Group 2 Group 3
OB bearing/
shaft
mm (in.) Bearing
30.000/29.990
(1.1811/1.1807)
50.000/49.987
(1.9685/1.9680)
70.000/69.985
(2.7559/2.7553)
Shaft
30.013/30.003
(1.1816/1.1812)
50.013/50.003
(1.9690/1.9686)
70.015/70.002
(2.7565/2.7560)
Fit
0.023T/0.003T
(0.0009T/0.0001T)
0.026T/0.003T
(0.0010T/0.0001T)
0.030T/0.002T
(0.0012T/0.0001T)
IB bearing/
shaft
mm (in.) Bearing
35.000/34.989
(1.3780/1.3775)
50.000/49.987
(1.9685/1.9680)
70.000/69.985
(2.7559/2.7553)
Shaft
35.014/35.004
(1.3785/1.3781)
50.013/50.003
(1.9690/1.9686)
70.015/70.002
(2.7565/2.7560)
Fit
0.025T/0.004T
(0.0010T/0.0001T)
0.026T/0.003T
(0.0010T/0.0001T)
0.030T/0.002T
(0.0012T/0.0001T)
Diameter/tolerance, inside diameter
In order to ensure proper fit between bearings and
the shaft, verify that the inside diameter (ID) of both
the IB and OB bearing are consistently within the
minimum/maximum values shown in figure 6-20. An
inside caliper should be used to check these ID
diameters on the bearings.