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Control of Industrial Major Accident Hazards (CIMAH) Report Page 20
Ranhill SAJ Sdn. Bhd. Revision 01
Part B: Information on the Installation Date Aug 2019

Kampung Tengah 2 Water Treatment Plant

Two (2) units of 15 kg/hr gas chlorinator for pre-chlorination are installed. Pre-
chlorination for algae control and intermediate chlorination is necessary only when
iron or manganese is present in the settled water.

Two (2) units of 15 kg/hr gas chlorinator for post-chlorination are installed. Post-
chlorination is always dosed to disinfect filtered water and to maintain a required
residue in the clear water tank. Both systems will have only one as duty and one as
standby.

The pre-chlorination dosing rate is manually adjusted proportionally to the raw water
inlet flow rate. The ejector installed is a manual system in the chlorinator room and
the dosing point injects chlorine directly to the raw water pipe prior to the aerator.
The post chlorination dosing rate is manually adjusted according to the filtered water
flow rate and Chlorine residual values. The ejector installed is a manual system
mounted at the contact balance tank.