Goulds Pumps 7200CB - IOM - Manual (Page 89)

Maintenance
b) Chill the new throat bushing (125), interstage bushing (146) and drum (129) using dry
ice or other suitable chilling substance, and install the bushing into the fit of the suction
cover (182) and head (184). The drum into the fit of the head (184). The interstage
bushing into the fit of the inboard suction cover (182A).
Be prepared to tap the bushing in place with a hardwood block or soft-faced hammer.
WARNING:
Dry ice and other chilling substances can cause physical injury. Contact the supplier for information and
advice for proper handling precautions and procedures.
c) Locate, drill and tap three new set screw holes equally spaced between the original
holes in each new bushing and bushing seat area.
d) Install set screw (222D and 222Z) and upset threads.
Replace the wear rings
The casing wear rings (164, 164A, 164B, 144) and impeller wear rings (202, 202A, 202B, 203)
are held in place by a press fit and three setscrews (222E, 320).
1. Remove the wear rings:
a) Remove the setscrews.
b) Remove the wear rings from the suction cover (182), the inboard suction cover (182A),
the intermediate cover (150), the discharge cover (150B) and the impeller (101-101M).
Use suitable pry or puller tools to force the rings from the fits.
You can also machine the rings for removal.
CAUTION:
Excessive machining can damage ring fits and render parts unusable.
2. Install new wear rings:
a) Thoroughly clean the wear-ring seats, and make sure that they are smooth and free of
scratches. For casing rings only, apply an anti-seize compound to the bore.
b) Heat the new impeller wear rings to 180°F–200°F (132°C–143°C) using a uniform
method for heating, such as an oven, and place them on the impeller (101-101M) wear-
ring seats.
WARNING:
Wear insulated gloves when you handle rings. Rings will be hot and can cause physical injury.
• 1. Wear ring - 202B (double suction), 203 (single suction and series)
• 2. Impeller - 101 through 101M
• 3. Wear ring - 202, 202A (1 st stage)
Model 7200CB, API Type BB5 Barrel Multistage / ISO 13709 2nd Edition / API 610 11th Edition Installation, Operation, and 87
Maintenance Manual