What specific coupling issue caused the water pressure drop?

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A Dislodged Coupling Caused the Water Pressure Drop in the Dry Rising Main

A dislodged coupling securing a part of the dry rising main at Block 309 Clementi Avenue 4 on July 31 led to a significant drop in water pressure, hindering firefighting efforts during a blaze that tragically resulted in a fatality. This malfunction prevented water from being effectively channelled to the eighth floor, where firefighters were actively engaged in combating the fire. The incident occurred despite the dry rising main at the affected block having been serviced and pressure-tested on March 14, at which time it was found to be in order.
Coupling Securing Part Became Dislodged

A preliminary assessment conducted by the Holland-Bukit Panjang Town Council identified that a coupling, which is a component used to secure a part of the dry rising main, had become dislodged. This dislodgement is the direct cause of the water pressure loss experienced during the firefighting operation. The incident required the Singapore Civil Defence Force (SCDF) crew to switch to a contingency method, involving running hoses directly from the fire engine up the staircase.
Dry Rising Main Previously Found in Order

The dry rising main system at the Clementi Avenue 4 block had undergone routine maintenance and a pressure test on March 14. During this inspection, the system was found to be operating correctly. The subsequent dislodgement of the coupling, which occurred during the firefighting operation on July 31, indicates a failure that arose after the previous servicing.
Repairs and Further Checks Underway

Following the incident, the town council has since repaired the dislodged coupling. The SCDF conducted tests on August 2 to verify the functionality of the repaired system. Additional checks are planned across other blocks managed by the town council to ensure the integrity of their firefighting water systems. The town council stated it is cooperating with the SCDF’s investigation and will review its maintenance and testing protocols.

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What specific coupling issue caused the water pressure drop?

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