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Control of Industrial Major Accident Hazards (CIMAH) Report Page 17
Ranhill SAJ Sdn. Bhd. Revision 01
Part B: Information on the Installation Date Aug 2019

Chlorine drums are arranged in two (2) rows of two (2) drums each (2 duty rows and
2 standby rows). Each row consists of two (2) drums which are individually
connected to a manifold using flexible copper tubing and manual isolating valve at
the manifold. Chlorine gas is withdrawn from one row while the other row is on
standby mode. The liquid withdrawal is controlled by a valve and a pressure switch
control. The controller is designed to allow only one-line bank to be opened at a time.
When the line bank is empty, a decreasing pressure initiates pressure switch which
will trigger the alarm. The switching over pressure is set at 1 bar.

Chlorine gas is fed to the Pre-Chlorination and the Post-Chlorination (Disinfection)
Chlorinator systems. Each system has two (2) vacuum regulators; one (1) duty and
one (1) standby.

The ejector uses a service water supply to create vacuum to ensure the water
passes through the dosing point. This vacuum draws the chlorine gas from the
vacuum regulators to the ejector, where it is mixed with water, producing chlorine
solution. Chlorine solution is delivered to the process via solution diffusers located at
the injection points.

There are two chlorinators per chlorinator system; one duty and one standby. In the
chlorinator, the chlorine gas flow is indicated by a flow meter and the feed is
controlled by a manual valve. Each chlorinator has an ejector that is located near the
chlorine application point.

Two (2) Chlorine drum-weighing scales, one for the duty drums and one for the
standby drums are provided. The drum-weighing scale is a hydraulic load cell type
with a digital gauge.

B.3.3 Chlorine Storage

Kampung Tengah 1 Water Treatment Plant

Sufficient storage is provided for forty-eight (48) cylinders of Chlorine. Chlorines are
stored under a pressure of eight (8) bar and a temperature of 32°C. The storage
areas are fully enclosed to contain Chlorine leaks and to force ventilation. When
ventilated fans are operated, a slight negative pressure is maintained in the store
and thus prevents gas from flowing through the clearances of the door and building.
Designated area is provided for empty cylinders. Cylinder specification and drawing
are provided in Appendix B2.