Bell & Gossett VTP2006 Series VTP – Vertical Turbine Pumps - Manual (Page 31)

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IMPELLER WEAR RING REMOVAL
1. Utilizing a diamond point chisel, cut two “V” shaped
grooves on the impeller wear ring approximately
180 degrees apart. Use extreme care not to damage
the wear ring seat.
2. With a chisel or drift, knock the end of one half of
the ring out, and pry the ring off.
3. On special materials such as chrome steel, set up the
impeller in a lathe and machine the wear ring off
using extreme care not to machine or damage the
ring seat.
BOWL AND LINESHAFT BEARING REMOVAL
Utilizing an arbor press and a piece of pipe or sleeve
with outside diameter slightly smaller than the outside
diameter of the bearing to press the bearing out.
NOTE: Bowl bearings are press fit. Do not
remove unless replacement is necessary.
INSPECTION AND REASSEMBLY
INSPECTION AND REPLACEMENT
1. Clean all pump parts thoroughly with a suitable
cleaner.
2. Check bearing retainers for deformation and wear.
3. Check shafts for straightness and excessive wear on
bearing surfaces. Average total runout should be less
than 0.0005” TIR per foot, not to exceed 0.005”
T.I.R. for every 10 feet of shafting.
4. Visually check impellers and bowls for cracks and
pitting. Check all bowl bearings for excessive wear
and corrosion.
5. Replace all badly worn or damaged parts with new
parts. In addition, replace all gaskets and packing as
required.
TURBINE BOWL WEAR RING INSTALLATION
Place chamfered face of the bowl or impeller wear ring
towards the ring seat and press the ring into the seat. Use
an arbor press or equal, making sure the ring is flush with
the edge or the wear ring seat.
INSTALL BOWL AND LINESHAFT BEARING
(Refer to Figure 1 for components numbers)
1. Press bearing (653) into retainer (652) using an
arbor press or equal.
2. Press bearing (690) into suction bowl/bell (689) by
using an arbor press or equal. The top of the bearing
should protrude above the suction hub equal to the
depth of the counter bore in the sand collar.
3. Place the bowl (670) with the flange downward and
press bearing (672) through chamfered side of bowl
hub until the bearing is flush with the hub by using
an arbor press or equal.
REASSEMBLY OF THE BOWL ASSEMBLY WITH
TAPERLOCK CONSTRUCTION
1. For ease in reassembly apply a thin film of turbine
oil to all mating and threaded parts.
2. If the sand collar is not assembled to the shaft,
install the sand collar. The sand collar is attached
to the shaft with a shrink fit. The larger diameter
of the counterbore of the sand collar goes toward
the suction bell bearing. Heat the sand collar until
it slips over the shaft and quickly position it so that
the bottom of the sand collar is set according to the
“X” dimension, before it cools. See Figure 21. See
Table 3 for the “X” dimensions. Slide the plain end
of the pump shaft into the suction bowl/bell bearing
until the sand collar rests against the suction bowl/
bell.
Wear protective gloves and use
appropriate eye protection to prevent
injury when handling hot parts.
Figure 21
TABLE 3 Sand Collar Location Dimension
Pump Model “X” Dim. Pump Model “X” Dim.
5C, 5T 1.88” 13A, 13RA 7.19”
5RWA 1.81” 13C 5.13”
6A, 6RA 3.13” 14DH 8.13”
6C 2.25” 14F, 14H,14RH 7.13”
6DH 3.50” 14RJ 5.06”
7A, 7RA 3.13” 15F 9.50”
7C, 7T, 7WA 2.81” 16B 6.56”
8A, 8RA 3.13” 16DH 8.63”
8DH 4.44” 16DM 5.88”
8I 2.94” 16F, 16RG 6.69”
8RJ 2.88” 18B 7.25”
9A, 9RA 3.41” 18C 6.63”
9RC, 9T, 9WA 5.19” 18D 7.56”
10A, 10RA 4.31” 18G 5.75”
10DH 6.31” 20B, 18L 6.88”
10L 6.25” 20E,18H 7.00”
10RJ 5.00” 20C 6.44”
10WA 5.19” 20H 9.00”
11A, 11RA 5.31” 24C 12.38”
11C 4.88” 24D 9.38”
11WA 5.13” 24E 8.13”
12C 5.31” 24F 10.44”
12DH 5.19” 24G 8.00”
12FR 6.50” 26G 7.75”
12WA, 12RA 5.00” 28G 8.75”
12RJ 4.94” 30B N/A
WARNING
WARNING