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Adhering to these procedures will help ensure proper
preservation and minimize the risk of rust and
corrosion during the standstill period.
Section 8: Disassembly, Reassembly, and
Inspection
Prior to performing any operations on the pump,
ensure that all power to the pump is disconnected.
8.1 Pump Disassembly:
1. Remove the rear bearing cover by loosening the nuts
securing the bearing and pedestal, and then remove
both.
2. Unscrew the gland nuts and remove the stuffing
box gland.
3. Loosen the nuts securing the pump casing to the
pump cover, along with the mounting bolts, and
remove the rear cover.
4. Take out the coupling, shaft locating groove, and
fore bearing component.
5. Disassemble the front cover and remove the shaft
and rotor assembly.
8.2 Pump Reassembly:
1. Place the shaft and rotor assembly into position and
firmly attach the front cover to the pump casing.
2. Connect the shaft locating groove and coupling.
3. Ensure the pump is positioned on a level surface and
securely affix the rear cover to the casing.
4. Assemble the stuffing box gland, pedestal, and
bearing.
5. Install the rear bearing cover.
8.3 Pump Inspection:
When it comes to inspection, maintenance and
inspection intervals can be planned based on
relubrication or grease change intervals, provided that
no shorter periods are specified after the first
inspection.
NBE O & M Document No. NES/NBE/O&M
In addition to the inspection measures mentioned
earlier, inspection should also include the following
checks:
• Impeller Alignment: Ensure that the impeller
alignment remains within the permitted tolerance
zones.
• Mounting Screws/Bolts: Verify that all mounting
screws/bolts are firmly tightened, except for stuffing
box-shaft seals if necessary.
During normal inspections, it is generally not
necessary to dismantle the machines, unless specific
issues or circumstances require it.
Page 31 of 43
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