RS – Multi-Stage, I-280
Centrifugal Pump 280 – 16.03.EN
46
5. Place impeller (2X) on an arbor and mount
between centers in a lathe or a grinder. Indicate
front outside impeller hub to within 0.002 TIR
maximum to be sure the arbor and impeller are
running square.
6. Turn the front outside wear ring surface of the
impeller (2X) until a 63 RMS or better finish is
obtained.
7. Measure the outside diameter of the front
impeller wearing surface and record this value.
See measurement instructions in Section XI,
Paragraph D.
8. Mount the interstage case (111) with new front
wear ring (7X) installed in a lathe. Indicate
female rabbet to within 0.002 TIR maximum.
NOTE
When replacing front wear ring with the
standard front wear ring, (part number
beginning with "00") machining in step 9 is not
required. When replacing front wear ring with
the undersize front wear ring (part number
beginning with "US") machining in step 9 is
required.
9. If replacing with an undersized front wear ring,
bore wear ring (7X) to within the specified
tolerance listed in Table 18 over the recorded
size of the outside diameter of the back impeller
wearing surface.
10. Reassemble pump. Refer to Section XI,
Paragraph F, steps 18 through 65.
Interstage Case Wear Ring (7B).
When pump is handling hazardous fluid,
extreme care must be taken to ensure safety of
personnel when attempting to drain pump and
piping before disconnecting the pumping unit.
Suitable protection devices should be used
and/or protective clothing should be worn.
1. Complete Section XI, Paragraph C, steps 1
through 15 before continuing.
2. Remove interstage case (111) with back wear
ring (7X) still installed and the impeller (2X) to a
work area with access to machine shop
equipment.
3. Remove the back wear ring (7X) from the
interstage case (111). This can best be
accomplished on a lathe for composite wear
rings. Hardened metal wear rings can be pried
out of case.
4. Press the new back wear ring (7X) into the
interstage case (111).
5. Place impeller (2X) on an arbor and mount
between centers in a lathe or a grinder. Indicate
front outside impeller hub to within 0.002 TIR
maximum to be sure the arbor and impeller are
running square.
6. Turn the back outside wear ring surface of the
impeller (2X) until a 63 RMS or better finish is
obtained.
7. Measure the outside diameter of the back
impeller wearing surface and record this value.
See measurement instructions in Section XI,
Paragraph D.
8. Mount the interstage case (111) with new back
wear ring (7X) installed in a lathe. Indicate
female rabbet to within 0.002 TIR maximum.
NOTE
When replacing back wear ring with the
standard front wear ring, (part number
beginning with "00") machining in step 9 is not
required. When replacing back wear ring with
the undersize back wear ring (part number
beginning with "US") machining in step 9 is
required.
9. If replacing with an undersized back wear ring,
bore wear ring (7X) to within the specified
tolerance listed in Table 18 over the recorded
size of the outside diameter of the back impeller
wearing surface.
10. Reassemble pump. Refer to Section XI,
Paragraph F, steps 18 through 65.
H. MOTOR. The motor should be maintained in
accordance with the manufacturer’s instructions.
I. CHECK VALVE. If applicable, the check valve
should be maintained in accordance with the
manufacturer’s instructions.
XII. PARTS LISTS AND DRAWINGS.
This section contains listings of parts and corresponding
drawings. Table 19 notes the recommended spare parts
for this pumping unit. Refer to Figures 13, 14, and 15,
for the location of parts identified by item numbers.
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