Procedure for Backwash of Sand Filter

1.0 OBJECTIVE
To lay down a procedure for backwash of ‘Sand Filter’.
2.0 SCOPE
This SOP is applicable to Formulations Units.
2.1.0 AREAS
2.1.1 D.M. Water Plant.
3.0 RESPONSIBILITY
Jr. Technical Officer / Executive (Production)
4.0 ACCOUNTABILITY
Manager Production.
5.0 PROCEDURE
5.1.0 Precautions
5.2.0 Pre startup
5.3.0 Operation
5.4.0 Shut Down
5.1.0 PRECAUTIONS
5.1.1 Before starting the back wash all valves should be closed.
5.1.2 Do not start raw water pump unless and until the valves SFV-3 and SFV-4 are open.
5.2.0 PRE STARTUP
5.2.1 Ensure the water level is up to the required level.
5.2.2 Put ‘ON’ main electrical supply switch.
5.3.0 OPERATION (Back Wash)
5.3.1 Disconnect the link of sand filter with D.M. water plant by closing all valves.
5.3.2 Open the valves SFV-3 and SFV-4.
5.3.3 Start the raw water pump.
5.3.4 Continue the back wash for 5 minutes.
5.4.0 SHUT DOWN
5.4.1 After back wash is over stop the raw water pump.
5.4.2 Close valves SFV-3, SFV-4 and open SFV-1 and SFV-2 for continuing normal operation.