Fire Hydrant 11
Fire Hydrant 11 : Non-Pressurized (Dry) Hydrants: In rural areas where municipal water systems are not available, dry hydrants are used to supply water for fighting fires. A dry hydrant is analogous to a standpipe. A dry hydrant is usually an unpressurized, permanently installed pipe that has one end below the water level of a lake or pond. This end usually has a strainer to prevent debris from entering the pipe. The other end is above ground and has a hard sleeve connector. When needed, a pumper fire engine will pump from the lake or pond by drafting water. This is done by vacuuming the air out of the dry hydrant, hard sleeve, and the fire engine pump with a primer. Because lower pressure exists at the pump intake, atmospheric pressure on the pond or lake forces water into part of the dry hydrant above water, into the hard sleeve, and finally into the pump. This water can then be pumped by the engine's centrifugal pump. Other types include (1) Water wells are also sometimes classified as fire hydrants if they can supply enough water volume and pressure. (2) Standpipes are connections for firehoses within a building and serve the same purpose as fire hydrants in larger structures. Standpipes may be "dry" or "wet" (permanently filled with water)
No records Found