PREVENTIVE MAINTENANCE OF DISTILLED WATER PLANT

1.0 PURPOSE:
    
    To  describe  a  standard operating  procedure  for  preventive  maintenance of distilled water plant. 
     
2.0    SCOPE:
    
     The standard operating procedure describes in detail the method  to  be followed  in preventive maintenance of  distilled  water  plant. 
    
3.0    RESPONSIBILITY:
    
    The responsibility of carryingout the preventive maintenance of  distilled  water  plant lies with the staff of rank  not  lower  than the junior utility operator. 
        
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:
    
4.1.0      Descaling of distilled water plant and condenser tubes:

4.1.1      Dismantle the water make-up line and fix dummy plug. 

4.1.2      Arrange a pump and a tank of 150 L. capacity near the distilled  water plant.

4.1.3      Connect  the pump discharge to the drain point of the distilled  water plant.

4.1.4      Dismantle the condenser cover at one end and arrange a  nipple.  Connect this nipple to tank.               

4.1.5      Connect the pump suction to the tank. 

4.1.6      Fill the tank with 100 L. of water and add 10 L. of hydrochloric acid (CP).

4.1.7      Switch "ON" the pump and circulate the water for about 1 hour.

4.1.8      After one hour pump the water out and fill the tank with  fresh  water and circulate it for 5 min.

4.1.9      After  5  min. pump the water out, and fill the  tank  with  DM   water  and circulate the water for 5 min. and  check  chlorides  content (by giving the sample to QC).  If chlorides present  in   water repeat this step till the absence of chlorides in water.

4.1.10     Fix the  condenser cover and water make-up line.

4.2.0      Descaling  of condenser shell:

4.2.1      Connect the pump discharge to the condenser water inlet.

4.2.2      Connect the condenser outlet to the tank.

4.2.3      Connect the pump suction to the tank.

4.2.4      Repeat steps 4.1.6 to 4.1.9.

4.3        Check  the  steam  valve  and  DM  water  valves.   If  leaking  rectify/replace them.

4.4        Frequency:

Preventive  maintenance of distilled  water  plant   should be conduct once in a year.
    
5.0        RECORDING:

    Responsibility of recording  the preventive maintenance in  the    compliance report lies  with the  staff of rank  not lower than  the maintenance engineer. 

Distilled water plant, engineering,