Goulds Pumps 3910 11th ed. - IOM - Manual (Page 42)

3. Chill new casing wear ring (164) using dry ice or other
suitable chilling substance, and install ring into fit of
casing (100). Be prepared to tap the ring in place with
a hard wood block or soft faced hammer (Fig. 33).
s
! WARNING
Dry ice and other chilling substances can cause physical
injury. Contact supplier for information and advice for
proper handling precautions and procedures.
4. Chill new seal chamber cover wear ring (230), using
dry ice or other suitable chilling substance, and install
ring into fit of cover (184). Be prepared to tap the ring
in place with a hardwood block or soft faced hammer
(Fig. 34).
s
! WARNING
Dry ice and other chilling substances can cause physical
injury. Contact supplier for information and advice for
proper handling precautions and procedures.
5. Locate, drill and tap three new set screw holes equally
spaced between the original holes in each new ring and
ring seat area.
6. Install set screws (222E and 320) and upset threads.
!
The impeller and wear ring clearance setting
procedures must be followed. Improperly setting the
clearance or not following any of the proper
procedures can result in sparks, unexpected heat
generation and equipment damage.
7. Check casing wear ring (164) runout / distortion by
measuring bore at each set screw location with inside
micrometers or vernier calipers (Fig. 35). Any distortion
in excess of 0.08 mm (.003 in.) should be corrected by
machining prior to trimming new impeller wear rings
(202 and 203).
8. Measure bore of casing wear ring (164) to establish the
required impeller wear ring (202) diameter to provide
the recommended running clearances as indicated in
Table 6 and subsequent note.
9. Repeat steps 7 and 8 for the seal chamber wear ring
(230).
10. Turn impeller wear rings (202 and 203) to size after
mounting on impeller (101).
NOTE A: All replacement impeller wear rings, except
those hard faced, are supplied 0.51 mm (.020 in.) to
0.75 mm (.030 in.) oversize.
NOTE B: Spare hard faced impeller wear rings are
not supplied oversize but are supplied to pre-
established proper running clearances when both
impeller and casing wear rings are renewed.
42
3910-1
1th IOM 5/08
Fig. 33
Fig. 34
Fig. 35