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At strategic
points on the ring
mains are provided hydrant stand
posts. The hydrant stand post
consists of a standpipe which is
operated through a valve. Near the
stand post, is placed a hose box
containing one or two hose pipes
for instantaneous coupling to
it. The nozzle
attached at the
end of the hose
delivers water at
high pressure in
the form of a jet
that can be
directed at the
seat of the fire
or at the roof of
the building.
The internal
piping comprises
of a riser pipe
called the Wet
Riser which
goes right up to
the terrace of the
building where it
is connected to
the overhead water
storage. The
riser which may be
pressurized, also
acts as a
down-take / down
comer to
serve the fire
fighting operation
as the need
arises. At every
floor, First
Aid Hose Reels
are provided which
ensure that water
will be available
under pressure at
all the corners of
every room to
fight the fire.
The riser is also
connected to the
static fire
storage tank at
the terrace level
through a Booster
pump. The
function of the
Booster pump is to
pump water from
the overhead
storage tank and
supply the same
through the down
take at
recommended
pressure. The
Booster pump is
thus also
available not only
to boost the
pressure but also
to act as a
hydrant pump
should the main
pump fail to
operate and
specially to fight
the fire from
within the
building. |
