UNIREX Pump - Manual (Page 48)

MARK 3 USER INSTRUCTIONS ENGLISH 71569102 08-06
Page 48 of 68 flowserve.com
Figure 6-19
Topic
ASME
B73.1M
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 note 3
0.05 (0.002) 0.05 (0.002)
See note 2
See note 3
n/s = not specified.
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 rpm: 20 g
✽
mm/kg (3 600 rpm: 0.011 oz-in/lb) of mass.
Flowserve performs a single plane spin balance on most
impellers. The following impellers are exceptions: 10X8-14,
10X8-16 and 10X8-16H. On these Flowserve performs a two
plane dynamic balance, as required by the ASME B73.1M
standard. All balancing, whether single or two plane, is
performed to the ISO 1940 Grade 6.3 tolerance criteria.
2. The ASME B73.1M 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 B73.1M, paragraph 5.1.4.
Figure 6-20
Group 1 Group 2 Group 3
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)
OB
bearing/
shaft
mm (in.)
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)
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)
IB
bearing/
shaft
mm (in.)
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)
Figure 6-21
Group 1 Group 2 Group 3
Bearing 71.999/71.986
(2.8346/2.8341)
110.000/109.985
(4.3307/4.3301)
150.000/149.979
(5.9055/5.9047)
Carrier
71.999/72.017
(2.8346/2.8353)
110.007/110.022
(4.3310/4.3316)
150.002/150.030
(5.9056/5.9067)
OB
bearing/
carrier
mm (in.)
Fit
0.031L/0.000L
(0.0012L/0.0000L)
0.037L/0.007L
(0.0015/0.0003L)
0.051L/0.002L
(0.0020L/0.0001L)
Bearing
71.999/71.986
(2.8346/2.8341)
110.000/109.985
(4.3307/4.3301)
150.000/149.979
(5.9055/5.9047)
Housing
71.999/72.017
(2.8346/2.8353)
110.007/110.022
(4.3310/4.3316)
150.007/150.025
(5.9058/5.9065)
IB
bearing/
housing
mm (in.)
Fit
0.031L/0.000L
(0.0012L/0.0000L)
0.037L/0.007L
(0.0015L/0.0003L)
0.046L/0.007L
(0.0018L/0.0003L)
6.8.4.5 Power end
Assembled bearing housing, carrier, bearings, and
shaft.
Shaft/shaft sleeve run-out
Shaft run-out is the amount the shaft is “out of true”
when rotated in the pump. It is measured by attaching a
dial indicator to a stationary part of the pump so that its
contact point indicates the radial movement of the shaft
surface as the shaft is rotated slowly. If a shaft sleeve is
used then shaft sleeve run-out must be checked. It is
analogous to shaft run-out. Measurement of shaft run-
out/shaft sleeve run-out will disclose any out of
roundness of the shaft, any eccentricity between the
shaft and the sleeve, any permanent bend in the shaft,
and/or any eccentricity in the way the shaft or bearings
are mounted in the bearing housing.
Shaft run-out can shorten the life of the bearings and
the mechanical seal. The following diagram shows
how to measure shaft/shaft sleeve run-out. Note that
both ends need to be checked. The run-out should
be 0.025 mm (0.001 in.) FIM or less.
Runout
Radial deflection - static
Radial movement of the shaft can be caused by a loose fit
between the shaft and the bearing and/or the bearing and
the housing. This movement is measured by attempting
to displace the shaft vertically by applying an upward force
of approximately 4.5 kg (10 lb) to the impeller end of the
shaft. While applying this force, the movement of an
indicator is observed as shown in the following diagram.
The movement should be checked at a point as near as
possible to the location of the seal faces. A movement of
more than 0.05 mm (0.002 in.) is not acceptable.