To describe a standard operating procedure for dechocking of impeller & replacing corroded impeller / refixing of loosened impeller of pumps.
1.0 PURPOSE:
To describe a standard operating procedure for dechocking of impeller & replacing corroded impeller / refixing of loosened impeller of pumps.
2.0 SCOPE:
The standard operating procedure describes in detail the method of dechocking of impeller & replacing corroded impeller / refixing of loosened impeller of pumps in the plant.
3.0 RESPONSIBILITY:
The responsibility of dechocking of impeller & replacing corroded impeller / refixing of loosened impeller of pumps lies with the staff of rank not lower than supervisor of maintenance department.
The responsibility of preparing, reviewing and approving the standard operating procedure lies with the Manager - Maintenance, Head of Production and Head of QAD respectively.
4.0 METHOD:
4.1 Isolate the equipment electrically.
4.2 Close the suction and discharge valves. Drain the material from the pump suction casing.
4.3 Remove the suction cover by removing the studs.
4.4 Remove the lock nut of the impeller and remove the impeller.
4.5 If the impeller is chocked, dechock the impeller using sharp edged metal rod.
4.6 Incase the impeller is loosened from the shaft, check the locking key and lock nut. If the lock nut and key are loose replace them. If the impeller bore or shaft are worn out, replace the impeller or the shaft as required.
4.7 Fix the impeller with new lock key (if the old lock key worn out).
4.8 Lock the impeller with lock nut.
4.9 Check the gasket of the suction cover. If it is damaged replace it as per the SOP No.SOP/MT/006R3.
4.10 Fix the suction cover.
4.11 Open the suction and discharge valves.
4.12 Restore the power supply to the equipment.
4.13 Switch on the pump and check the functioning of pump to the desired levels.
4.14 Record the replacement data of impeller/shaft in the history card of the equipment.
5.0 RECORDING:
The responsibility of recording the details in the equipment history card lies with the staff of rank not lower than the Maintenance supervisor.
Refixing of loosened impeller of pumps ,replacing corroded impelle, engineering
