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Water delivery from a fire hydrant/ Relaying water delivery
1. Water delivery from a fire hydrant
(1) The capability of water delivery from a fire hydrant
In case of water delivery from a fire hydrant, make sure the fire hydrant can provide
enough water for water discharge.
As the capability of water delivery from a fire hydrant depends on the plug caliber,
piping condition and initial water pressure, it is required to examine the reciprocal
influence of those factors. If the fire hydrant has high initial water pressure, for example,
but its plug caliber is small, the capability of water delivery is not enough. On the
contrary, even if the water pressure is low but its plug caliber is big, it has enough
capability to deliver water.
(2) How to deliver water.
(a) As high water delivery pressure might damage the suction pipe when delivering
water into the pump, use the hose and connect with metal fitting joint as a general
rule.
(b) As water source of a fire hydrant might contain the extraneous materials such as dirt
or small stones, remove them in opening the valve and discharging the water before
connecting the hose.
(c) Fully open/close the valve of a fire hydrant as a general rule and make adjustment
of open degree only if the water delivery pressure is especially high.
(d) Open the water discharge valve and confirm the compound pressure gauge
before starting the pump engine.
(e) After the engine starts, regulate the throttle to let the pressure of compound
pressure gauge to be more than 0.05Mpa.
(14)
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