| This system consists of high
velocity water spray nozzles, sprinkler bulbs,
deluge valves and piping.
This system employs either wet pilot or dry pilot
actuation. There will be two pipelines running
adjacent to each other around the equipment to
be protected. One is the detection line provided
with normal sprinkler bulbs and the other is a
dry pipeline fitted with high velocity spray nozzles.
Wet pilot system uses water in the detection pipeline
whereas compressed air is used in the dry pilot
system. The detection pipeline connected to the
deluge valves keep the diaphragm of the valve
in closed position. During detection of fire and
breakage of sprinkler bulbs, the pressure in the
detection line reduces, resulting in the opening
of the deluge valves and the release of water
in the mist form to the protected area.
The rapid movement of the broken streams of water
is suddenly arrested at the oil surface and the
impact causes the oil to be broken up into tiny
globules to form an emulsion with water. In addition,
the dispersion of oil into the minute globules
in the water gives instantaneous cooling, thus
preventing formation of oil vapor.
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