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Dry and wet rising mains are intended for use by the Fire Brigade or other trained personnel, enabling the rapid employment of water to help fight fire in a building. Dry risers are 'uncharged' rising mains with outlet valves on each floor (typically located in convenient positions, like stair-case enclosures, for example) and an inlet valve external to and/or beneath the ground floor, so that the Fire Brigade can readily connect into the water supply. A wet riser is permanently charged with water.
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Inspection / Maintenance
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Dry and wet risers, as well as underground hydrants and hose reels, require regular inspection and occasional maintenance to ensure that they will work in an emergency. Since 1989, it has been the responsibility of a building's owner / occupier to keep its hydrant systems in working order.
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