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Control of Industrial Major Accident Hazards (CIMAH) Report Page 8
Ranhill SAJ Sdn Bhd Revision 01
Part A: Information on the Hazardous Substances Date Aug 2019
A.2.0 ANALYTICAL METHODS
A general description of the analytical methods available to the manufacturer
for determining the presence of the hazardous substance, or reference to such
methods in the specific literature
The Chlorine cylinder on-site KT1 WTP was supplied by CCM Chemicals Sdn Bhd
and Chlorine drum on-site KT2 WTP was supplied by May Chemical Sdn. Bhd.,
these suppliers is responsible for the quality of Chlorine supplied to the WTP. The
supplier provided the relevant test certificates regarding the compositions of Chlorine
and the Safety Data Sheet as per the requirements under the provision of the
Classification, Labelling and Safety Data Sheet of Hazardous Chemicals (CLASS)
Regulations 2013.
A.2.1 Chlorine
The following describes the analytic method available in determining the presence of
chlorine as supplied to the plant.
A.2.1.1 Analytical Methods for Determining the Presence of Chlorine
There are few analytical standards available for determining chlorine as follows:
• UK BS 3947:1976. Specification for liquid chlorine
• ASTM E410-70. Standard method of test for moisture and residue in liquid
chlorine
• ASTM E1746-08. Standard test method for sampling and
• Singapore SS 131: 2014. Specification for liquid chlorine
Based on BS 3947:1976, the presence of chlorine in atmosphere can be determined
by using the Drager indicator tubes method. Chlorine can be easily detected due to
its characteristic of pungent odour. Gaseous chlorine is a greenish-yellow gas at
normal ambient temperature and pressure.
A.2.1.2 Physical Detection
The presence of Chlorine on-site can be detected through physical detection via
visual (colour) and smell. Any leak of chlorine gas can be identified by its powerful
pungent odour and dense greenish-yellow gas. As Chlorine is 2.5 times heavier than
air, any chlorine gas leak will tend to remain close to ground level.
