REPLACEMENT OF SPARES OF MECHANICAL SEAL UNIT OF PUMPS

1.0  PURPOSE:
    
    To describe a  standard operating procedure for replacement  of spares of mechanical seal unit of pumps.
    
2.0    SCOPE:
    
    The standard operating procedure describes in detail the method of replacing spares of mechanical seal unit of pumps in the plant.
    
3.0    RESPONSIBILITY:
    
    The  responsibility of replacing the spares of mechanical  seal unit 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    Remove the guard.
    
4.3    Close the suction and delivery valves.
    
4.4    Open  the suction cover, Remove impeller and volute  casing  of the pump.
    
4.5    Unlock  the mechanical seal unit from the sleeve and  take  out the seal unit.
    
4.6    Dismantle the seal unit.
    
4.7    Check  springs, 'O' rings and both (Rotary and Stationary parts) the mating surfaces  of  the  seal unit.  Replace the 'O' rings and springs if they are found deformed.
    
4.8    Replace the mating surfaces if they are found damaged.
    
4.9    Fix  volute casing and impeller with key and tighten the  lock-nut.
    
4.10    Lock  the seal unit to the sleeve with grub screws for allowable tension.
    
4.11    Fix  the  suction cover with gasket and ensure that  the  shaft rotates freely.
    
4.12    Fix  the  suction and delivery pipes, open the  suction  valve, check whether the seal is leaking or not.
    
4.13    If  the  seal does not leak, open delivery valve,  restore  the power supply to the equipment and switch on the pump.
    
4.14    If  the seal leaks repeat steps 4.1 to 4.12 till the seal  does not leak.
    
5.0    RECORDING:
    
    The  responsibility of recording the replacement of  spares  of  mechanical seal unit of  pumps in history  card as per the  SOP  lies  with  the staff of rank not lower  than  maintenance  supervisor.    
 

Mechanical seal unit of pumps, replacement of spares, engineering, 'o' rings