Group Curve
Casing
Material
Acceptable minimum standard ANSI mating flanges and
fittings
Suction Discharge
M
and
S
G Bronze 300 PSI flat face bronze 300 PSI flat face bronze
H C1
250 PSI flat face cast iron 250 PSI flat face cast iron
7.10 Overhaul of pump
The following items should be checked:
1.
Wearing Ring Clearance:
The original diametral clearance between the impellers and case wearing rings for different materi-
als is shown on Figure 20: on page 39. Clearance between casing wearing rings and optional im-
peller wearing rings is also shown. When hydraulic performance is reduced substantially, the casing
rings and/or impeller rings should be replaced. The diametrical clearance on one impeller should
not exceed the clearance on the other impeller in the same pump by more than .003".
NOTICE:
1.
Replacement impeller rings are furnished .021" to .039" oversize and must be turned to
size after mounting on impeller. See wearing ring chart below.
2. The diametrical clearance on one impeller should not exceed the clearance on the oth-
er in the same pump by more than .003 ".
3. The fit of the impeller hubs on the shaft (not illustrated) is a tap to a slip fit per chart
below.
Group
Fit of impeller hub to shaft on diameter
Iron or bronze impeller Steel impeller
S -.003 / -.0013
-.0002/+.0008M
-.0002/+.0008
L
4. The impeller key has a sliding fit on the sides and a .008" to .016" clearance at the top
(not illustrated).
5.
The initial diametrical clearance of the shaft sleeves to the throat is .020" to .024 (not
illustrated).
7.10 Overhaul of pump
38 3316 Installation, Operation and Maintenance Instructions
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