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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.
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