What measures were in place to detect toxic gas before the incident?

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Detection Measures for Toxic Gas Prior to the Incident

Sensors at the Choa Chu Kang Waterworks recorded hydrogen sulphide levels exceeding safe thresholds, and an alarm was triggered at the time of the incident. These readings indicated a hazardous environment due to the presence of toxic gas. The incident involved workers cleaning a water treatment process tank when three collapsed after entering an enclosed passage beneath it.
Hydrogen Sulphide Levels Exceeded Safety Thresholds

At the time of the incident on May 23, 2024, sensors within the waterworks facility detected hydrogen sulphide at levels that surpassed established safe limits. This gas is known to be toxic and potentially fatal even at low concentrations, according to the Ministry of Manpower (MOM).
Alarm System Was Activated

In conjunction with the elevated hydrogen sulphide readings, an alarm was activated at the location. This suggests that a system was in place to alert personnel to dangerous atmospheric conditions within the facility.
Workers Entered Confined Space Without Adequate Ventilation

Investigations revealed that the workers, employed by contractor Stargroup and its subcontractor, had entered an enclosed passage beneath a water treatment process tank. This confined space operation preceded the detection of toxic gas and the subsequent collapse of three workers, two of whom later died.
Contractor Charged for Workplace Safety Lapses

Following the incident, Stargroup was charged for failing to implement reasonably practicable measures to minimise workplace risks. The company had been contracted by PUB for routine tank cleaning operations at the waterworks.

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What measures were in place to detect toxic gas before the incident?

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