Goulds Pumps 3610 - IOM - Manual (Page 74)

Maintenance
5. Turn the impeller wear ring to size after you mount it on the impeller .
NOTICE:
The impeller and wear-ring clearance setting procedures must be followed. Improperly
setting the clearance or not following any of the proper procedures can result in sparks,
unexpected heat generation, and equipment damage.
All replacement impeller wear rings, except those that are hard-faced, are supplied 0.020
in. to 0.030 in. (0.508 mm to 0.762 mm) oversize. See the table Minimum running
clearances for final running clearances. Machine the impeller rings accordingly.
Spare hard-faced impeller wear rings are not supplied oversize but are supplied to pre-
established proper running clearances when both impeller and casing wear rings are
renewed.
When the impeller assembly is supplied as a spare part (impeller with wear rings), the wear
rings are machined to the required dimension.
Minimum running clearances
Impeller wear rings
Replace wear rings when the diametrical clearance exceeds the values shown in this table or when the
hydraulic performance has decreased to unacceptable levels:
Diameter of rotating member at clearance Minimum diametrical clearance
in. mm in. mm
<2.000 <50.00 0.010 0.25
2.000 to 2.4999 50.00 to 64.99 0.011 0.28
2.500 to 2.999 65.00 to 79.99 0.012 0.30
3.000 to 3.499 80.00 to 89.99 0.013 0.33
3.500 to 3.999 90.00 to 99.99 0.014 0.36
4.000 to 4.499 100.00 to 114.99 0.015 0.38
4.500 to 4.999 115.00 to 124.99 0.016 0.41
5.000 to 5.999 125.00 to 149.99 0.017 0.43
6.000 to 6.999 150.00 to 174.99 0.018 0.46
7.000 to 7.999 175.00 to 199.99 0.019 0.48
8.000 to 8.999 200.00 to 224.99 0.020 0.51
9.000 to 9.999 225.00 to 249.99 0.021 0.53
10.000 to 10.999 250.00 to 274.99 0.022 0.56
11.000 to 11.999 275.00 to 299.99 0.023 0.58
12.000 to 12.999 300.00 to 324.99 0.024 0.61
13.000 to 13.999 325.00 to 349.99 0.025 0.63
14.000 to 14.999 350.00 to 374.99 0.026 0.66
15.000 to 15.999 375.00 to 399.99 0.027 0.69
16.000 to 16.999 400.00 to 424.99 0.028 0.71
17.000 to 17.999 425.00 to 449.99 0.029 0.74
18.000 to 18.999 450.00 to 474.99 0.030 0.76
19.000 to 19.999 475.00 to 499.99 0.031 0.79
20.000 to 20.999 500.00 to 524.99 0.032 0.81
21.000 to 21.999 525.00 to 549.99 0.033 0.84
22.000 to 22.999 550.00 to 574.99 0.034 0.86
23.000 to 23.999 575.00 to 599.99 0.035 0.89
24.000 to 24.999 600.00 to 624.99 0.036 0.91
25.000 to 25.999 625.00 to 649.99 0.037 0.94
For diameters greater than 25.999 in. (649.99 mm), the minimum diametrical clearances shall
be 0.037 in. (0.94 mm) plus 0.001 inch for each additional inch of diameter or fraction thereof
(1 mm for each additional 1 mm).
72 Installation, Operation, and Maintenance Manual