ITT 3610 i-FRAME Manual page 93

320
142
Figure 67: Wear ring replacement
c) Locate, drill, and tap three new setscrew holes equally spaced between the original holes in
each new ring and ring seat area.
d) Install the setscrews (320) and upset threads.
3. Check the casing wear-ring (164) runout and distortion by measuring the bore at each setscrew lo-
cation with inside micrometers or vernier calipers.
Machine any distortion in excess of 0.08 mm | 0.003 in. before you trim the new impeller wear rings
(142).
4. Confirm with inside micrometers or vernier calipers the bore of the casing wear rings (164).
5. Turn the impeller wear ring to size after you mount it on the impeller .
NOTICE:
The impeller and wear-ring clearance setting procedures must be followed. Improperly set-
ting the clearance or not following any of the proper procedures can result in sparks, unexpect-
ed heat generation, and equipment damage.
All replacement impeller wear rings, except those that are hard-faced, are supplied 0.508 mm to
0.762 mm | 0.020 in. to 0.030 in. oversize. See the table Minimum running clearances for final run-
ning clearances. Machine the impeller rings accordingly.
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.
When the impeller assembly is supplied as a spare part (impeller with wear rings), the wear rings
are machined to the required dimension.
6.5.4.3 Minimum running clearances
Impeller wear rings
Replace wear rings when the diametrical clearance exceeds the values shown in this table or when the hy-
draulic performance has decreased to unacceptable levels:
Diameter of rotating member at clearance
mm
<50.00
3610 i-FRAME API 610 11th Ed/ISO 13709 2nd Ed, API Type BB1 Single-Stage, Axially-Split, Between-Bearing IOM
142
101
in.
<2.000
320
Minimum diametrical clearance
mm
0.25
6.5 Preassembly inspections
in.
0.010
91