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Control of Industrial Major Accident Hazards (CIMAH) Report Page 9
Ranhill SAJ Sdn Bhd Revision 01
Part A: Information on the Hazardous Substances Date Aug 2019
The physical condition of the drums and outlet valves are thoroughly checked for
signs of wear and tear, and of corrosion. The amount of chlorine in the drums can be
known by deducting the weight shown on the weighing scale and the tare weight of
the drum that is imprinted on every drum name plate. The filled and empty drums are
clearly marked and grouped separately in the chlorine room.
A.2.1.3 Gas Detector System
Gas detectors are installed at strategic locations inside the Chlorine Plant to detect
the presence of Chlorine. Once detected, the alarm will be triggered to alert the
personnel on-site. Table A.2.1.4a below details the location and units of gas
detectors in place.
WTP Location Units
Kampung Tengah 1 Chlorine Room 4 units
Chlorinator Room 2 units
Kampung Tengah 2
Drum Storage Room 3 units
Source: KT1&2 WTP
Table A.2.1.4a: Location and Quantity of Chlorine Gas Detectors
The gas detectors consist of a sensor unit connected by a coaxial cable to an
amplifier unit. The gas detector units are using Gas Monitor System (GMS), a gas
detector system manufactured with the brand name of RAE and Grundfos. The
sensor is an electrochemical type where a current will flow in the presence of
chlorine gas. The measuring range for chlorine is 1.0 to 10.0 ppm with a sensitivity of
0.1 ppm. The gas detectors sensor calibration certificate is provided in Appendix
A3.
The GMS panel is located outside or separated from the Chlorine room. When the
gas concentration in the air exceeds the preset value, the leak detector will release a
visual audible alarm.
The gas detectors are set to trigger the alarm upon detection of chlorine at 1.0 ppm.
This will activate the siren outside the chlorine room which can be heard throughout
the site. The gas detectors, alarm and safety systems are set as described in Table
A.2.1.4b below.