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Control of Industrial Major Accident Hazards (CIMAH) Report Page 37
Ranhill SAJ Sdn. Bhd. Revision 01
Part D: Information on the Potential Major Accident Date Aug 2019

D.6.1.3 Physical Effect Modelling

The objective of consequence modelling is to identify the magnitude and extent of
major accident consequences on people, plant and surrounding.

The consequence arises from Chlorine gas releases could lead to people being
overexposed to hazardous toxic gas.

The following table is adopted from DOSH guidelines, provides the criteria of effects
for chlorine acute health effect.

Hazard
Hazard Type Effects on Human Effects on Property
Criteria
Toxic Gas Release

10ppm Immediate danger to life Not foreseeable effects on
(IDLH) and health property

Toxic Gas
(Acute Effect) 495ppm Significant injury and Not foreseeable effects on
(50% fatality) fatality property

4827ppm Not foreseeable effects on
(100% fatality) 100% fatality probability property

D.6.1.4 Consequences Analysis Result

The consequence analysis and results are presented in the Appendix D1.

Appendix D1 shows the summary of the analysis of the outcomes, and the impact
contours indicated on the plant layout or map.

The consequences to the surrounding community likely to be affected by major
accidents are presented in Table D.6.1.4.

Figure D.6.1.4 provides the relationship of the consequence maximum distance from
release source of an accident event and the acute health effects (IDLH, 50% fatality
and 100% fatality).

From the analysis, under the single failure event of “storage door opened”, the
maximum consequence distance is highest at “drum rupture”, and followed by “major
leak” and “small leak”.