Make sure that the casing wear ring (103) and anti-rotation pins (445A) seat properly in the wear
ring grooves and pin grooves.
2.
Tighten or loosen the sleeve nuts with a strap wrench as required in order to center the impeller in
the seated wear rings.
For M, L, and XL groups, tighten the sleeve nuts (124) to 30 ft-lbs (40.7 Nm).
3.
Tighten the sleeve nut setscrews (222B).
Make sure that the stuffing box bushings (125) are aligned properly in the stuffing boxes.
4.
Tighten the bearing housing to the lower casing on each side.
a) Install and tighten the screws (372U) until snug.
b) Tighten the screws on each side to 40 ft-lbs (55 Nm).
c)
Tighten each side to 59 ft-lbs (80 Nm).
6.7.5 Assemble the casing
Make sure that the mating surfaces on the upper and lower halves of the casing are clean.
1.
Install the gasket (351).
2.
Carefully align and install the upper casing using a hoist, lift, and sling attached to lifting lugs on the
upper casing.
3.
Install the dowel pins (496G).
4.
Install the screws (426) and parting nuts (425) on the studs (356A) and tighten as follows:
a) Using an X pattern working outwards towards the flanges, tighten the nuts and screws to the
following torque:
• S and M groups: 40 ft-lbs (55 Nm)
• L and XL groups: 60 ft-lbs (80 Nm)
b) Using the same pattern, increase the torque to the following:
• S and M groups: 90 ft-lbs (122 Nm)
• L and XL groups: 180 ft-lbs (245 Nm)
c)
Using the same pattern, tighten again to the following torque:
• S and M groups: 105 ft-lbs (142 Nm)
• L and XL groups: 255 ft-lbs (345 Nm)
d) Recheck the torque on each nut and screw.
6.7.6 Complete the assembly
1.
Install the stuffing box packing (106) and lantern rings (105).
See
5.9 Seal the shaft with a packed stuffing box on page 45
.
2.
Install the stuffing box gland (107) and nuts (355).
Make sure to only finger-tighten the nuts.
3.
Adjust the glands.
4.
Install the oiler (251) and drain plugs if they were removed.
Perform the following as required:
1.
Lubricate the bearings.
2.
Align the pump and driver.
3.
Connect the coupling.
4.
Replace the coupling guard.
5.
Replace the sealing liquid.
6.7 Reassembly
Model 3410 Installation, Operation, and Maintenance Manual
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