Flowserve IJ, Installation Operation & Maintenance

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IJ PUMP OPERATION AND MAINTENANCE MANUAL
BO2660-01 6-26
6.5.2.6.9 Replacing Impeller Wearing Rings
Unless the impeller skirt wearing surface has been ground down, the standard size wearing ring
should be used for replacement. To replace an impeller wearing ring proceed as follows:
CAUTION
Striking or cutting into parent metal of impeller will make
replacement necessary.
1. Remove wearing ring retainers:
a. Machine off, or using rotary file grind off, tack welds that hold rings to impeller.
b. If tack welds were used machine or grind off welds.
2. Block or suspend impeller face down. Apply heat to ring only, evenly and quickly, using a
torch with a Rosebud head. The ring will normally fall off. If not, tap ring off or use two pry
bars at diametrically opposite points and pry it free of impeller. Alternately, ring can be
machined off impeller.
3. See that requirements under VISUAL INSPECTION above, which apply to wearing rings,
are complied with for the new ring.
CAUTION
Do not bind or otherwise cause undue stress on wearing
rings.
4. Determine that impeller has cooled to ambient temperature by feeling with hand then heat
wearing ring as described in step 2 until ring will slip into place on skirt.
5. If the replacement wearing ring has not been furnished with finish stock left on the running
surface, then verify trueness of wearing-ring-to-impeller fit as outlined below or by an
equivalent technique:
a. Set impeller face down on table of vertical lathe and parallel with face of table.
b. Align centerline of part with centerline of table using register face of part as true side of
dial indicator; alignment shall be within limit given in OPERATING SPECIFICATIONS.
c. Clamp around part to hold it in centered and parallel position.
d. Set up dial indicator to run on outside diameter of wearing ring and rotate table; total
runout shall not exceed maximum given in OPERATING SPECIFICATIONS.
6. Install new keys and tack weld them to metal of parent part using gas-tungsten arc and
appropriate wire. Note: some installations use interference fit only to secure ring. Then repeat
step 7.
7. If the replacement wearing ring has been furnished with finish stock left on the running
surface, true cut the wearing ring using the following procedure, or an equivalent:
a. Center the parent part on a vertical lathe by following steps 7.a. through 7.c. above.
b. Machine the finish stock from the outside diameter of the wearing ring to meet the
clearances specified in OPERATING SPECIFICATIONS.
8. Verify trueness of wearing-ring-to-part fit as outlined in step 7. above .