Bell & Gossett V1001576 Suction Diffuser Plus - Manual (Page 16)

Maintenance
Inspect the orifice cylinder
Periodic inspection of inlet vanes and cleaning of the orifice cylinder is required to guard
against damage to the pump. If damaged, they must be replaced.
Service the suction diffuser plus
Periodically inspect the Suction Diffuser Plus for signs of leakage or corrosion.
WARNING:
Risk for property damage, serious personal injury or death. You must replace the suction
diffuser if corrosion or leakage is found.
To service and inspect the Suction Diffuser Plus , complete the following steps:
1. Shut the pump off and isolate the Suction Diffuser Plus and pump from the system.
2. Allow system temperature to cool to below 38°C (100°F) to reach a safe handling
temperature.
WARNING:
High temperature and pressure hazard. Make sure that system
temperature is below 38°C (100°F) and system pressure is reduced
and maintained at zero before servicing the unit.
3. Open a drain valve in the isolated Suction Diffuser Plus piping and allow system
pressure to drop to zero. If fluid continues to flow from the drain valve, repack or
replace the isolation valves before proceeding.
4. Loosen the screws that secure the Suction Diffuser Plus cover and break it loose from
the body. Make certain all drainage stops before removing the screws and cover.
5. Grasp the inlet vane assembly with pliers and pull it out of the Suction Diffuser Plus
Body.
6. Remove start up strainer if still in place and inspect the orifice cylinder and inlet vane
assembly for damage. Replace damaged components with new components as
required.
7. Inspect the O-ring seal and replace with new component as required.
8. Reassemble the Suction Diffuser Plus and secure the cover with a criss-cross
tightening pattern.
9. Open isolation valves slowly and inspect the gasket area for leaks.
10. Return system to normal operation.
Service P/T ports or drain plugs
The P/T readout ports and drain plugs come pre-assembled with a leading industrial
thread sealant, Loctite, and are tightened to appropriate levels. Any field adjustment of
factory installed components breaks the original thread seal and could cause leakage.
This adjustment necessitates the removal, cleaning, and resealing of those parts per the
following instructions.
1. Remove the desired component from the Suction Diffuser Plus.
2. Clean off all of the old thread sealant using a wire brush and gentle abrasion if
necessary.
Maintenance
14 Suction Diffuser Plus INSTRUCTION MANUAL