Impeller replacement
This table shows the criteria for replacing the impeller:
Impeller parts When to replace
Impeller vanes
•
When grooved deeper than 1.6 mm | 1/16 in., or
•
When worn evenly more than 0.8 mm | 1/32 in.
Pumpout vanes When worn or bent more than 0.8 mm | 1/32 in.
Vane edges
When you see cracks, pitting, or corrosion damage
Impeller checks
NOTICE:
Protect machined surfaces while cleaning the parts. Failure to do so may result in equipment
damage.
•
Check and clean the impeller bore diameter.
•
Check the impeller balance. Rebalance the impeller if it exceeds the ISO 1940 G1.0 criteria.
NOTICE:
You must have extremely accurate tooling equipment to balance impellers to the ISO 1940
G1.0 criteria. Do not attempt to balance impellers to this criteria unless this type of tooling and
equipment is available.
Impeller areas to inspect
101
Impeller
202 and 203 Impeller wear rings
Figure 50: Areas to inspect for wear on impeller
Venturi Insert Inspection (3700LFI Only)
Inspect the insert for excessive wear or pitting. Inspect the notch and the through hole on the end of the
venturi insert. Ensure no foreign material is present. Clean thoroughly in order to remove any debris. Re-
place insert if there is any damage, wear, or pitting present to the notch, through hole, or gasket surfa-
ces.
6.5 Preassembly inspections
78
Model 3700, 3703, 3710, 3700LF, 3700LFI API Type OH2 / ISO 13709 1st and 2nd Ed. / API 610 8/9/10/11th Ed. Instal-
lation, Operation, and Maintenance Manual
Summary of Contents for Goulds Pumps 3700
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