Goulds Pumps 3910 11th ed. - IOM - Manual (Page 39)

Table 6
Minimum Running Clearances
Diameter of
Impeller
Wear Ring
Minimum
Diametral
Clearance
mm in. mm in.
<50 <2.000 0.25 0.010
To to 64.99 2.000 to 2.4999 0.28 0.011
65 to 79.99 2.500 to 2.999 0.30 0.012
80 to 89.99 3.000 to 3.499 0.33 0.013
90 to 99.99 3.500 to 3.999 0.35 0.014
100 to 114.99 4.000 to 4.499 0.38 0.015
115 to 124.99 4.500 to 4.999 0.40 0.016
125 to 149.99 5.000 to 5.999 0.43 0.017
150 to 174.99 6.000 to 6.999 0.45 0.018
175 to 199.99 7.000 to 7.999 0.48 0.019
200 to 224.99 8.000 to 8.999 0.50 0.020
225 to 249.99 9.000 to 9.999 0.53 0.021
250 to 274.99 10.000 to 10.999 0.55 0.022
275 to 299.99 10.000 to 11.999 0.58 0.023
300 to 324.99 12.000 to 12.999 0.60 0.024
SEAL CHAMBER COVER (184)
Seal chamber cover is available in two versions: one
(optional) has a cooling chamber and water jacket cover
(490) and the other (standard) does not. The (optional)
cooled version is used when elevated pumpage
temperatures are present.
1. Ensure all gasket/O-ring sealing surfaces are clean and
have no damage that would hinder or prevent sealing
(Fig. 28).
2. Ensure all cooling (where applicable), flush and drain
passages are clear.
3. Inspect other surfaces for damage. Replace if worn,
damaged or corroded more than 3.2 mm ( 1
8
in.) deep.
4. Measure inside diameter of seal chamber cover
bushing (125). If the diametral clearance between it
and the impeller hub (101) exceeds 1.20 mm (.047 in.),
one or both parts should be replaced. Refer to
Renewal of Wear Parts for replacement instructions
for seal chamber cover bushing.
3910-1
1th IOM 5/08
39
Fig. 26
Fig. 27
Fig. 28
6