Fire hydrant pump systems (also known as fire pumps, hydrant boosters, fire water pumps) are high pressure water pumps designed to increase the fire fighting capacity of a building by boosting the pressure in the hydrant service when mains is not enough, or when tank fed. They can also be used in water transfer and irrigation applications.
There are two types:
WET BARREL used in locations where temperatures do not drop below freezing. These hydrants always have water in the barrel and do not have to be drained after each use.
DRY BARREL used in locations where temperatures may fall below freezing. Hence the water has to drain back into the supply line so as not to freeze in the valve.
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