UNIREX Pump - 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)

n/s

0.03 (0.001)

0.05 (0.002)

0.076 (0.003)

0.05 (0.002)

Seal chamber

Face squareness to shaft

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

See note 3

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)

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)

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)

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)

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.