[Update 3]
SCDF mitigation operations of the ammonia leak incident is
ongoing.
Initial mitigation efforts involved shutting off the main supply
line and several control valves. This confined the area of
operations to a chiller room and part of the loading/unloading
bay.
The source of the ammonia leak has been traced to a main
distribution pipe. The pipe is not easily accessible as it is
installed within a metal plate ceiling and further concealed by
layers of insulation materials.
In the last three hours, the concentration of the ammonia vapour
within the affected area, as registered with HazMat detectors, had
diminished considerably.
Notwithstanding this, as an added precautionary measure, SCDF has
deployed three water curtains within the premises. This is to
suppress any residual ammonia vapours which may escape beyond the
affected area.
It is expected to be an extended operation.
-- SCDF Facebook Page