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Fire technical specifications, the most unfavorable point of the fire hydrant hydrostatic pressure should not be less than 0.07Mpa, the most unfavorable nozzle working pressure should not be less than 0.05Mpa. In the actual design, the fire water tank often need to set up the booster pump to meet the pressure requirements. Some people will be pressurized water pump outlet pipe as a fire water tank outlet, which is very wrong approach. The main purpose of setting water booster pump is in the initial stage of a fire fire pump before the start of the system to meet the requirements of the fire hydrant and sprinkler water pressure, the water on the fire hydrant water supply system should not be greater than 5L / s, the automatic sprinkler system should not be greater than 1L / s, obviously size on the requirements of the indoor fire water. Can not meet the requirements of the initial fire fighting water. Therefore, in the roof of the booster pump should be installed on the side of the pump outlet pipe, the water flow should not be less than the initial water needs of the fire fighting.
Two, fire water tank outlet pipe is not set one-way valve
Some people will use the fire fighting water supply pipe fire or fire pump water through the fire water tank and then into the fire pipe network. These practices reduce the fire pipe pressure, can not guarantee the full play of fire fighting equipment, so should use life pipeline to supply water to the fire water tank, and a one-way valve in the outlet pipe of fire water tank, fire water tank to prevent the fire pump into the water.
Three, the fire tank is not set in the highest part of the building
Some local steel structure roof of large space buildings, such as the stage of the theatre, the designer will fire water tank is arranged in the bearing capacity of the reinforced concrete structure building relatively good intermediate layer, but lower than the most disadvantageous sprinkler height, boost pump lift to meet the highest requirements of sprinkler working pressure. The idea of the designer is that the specification of the fire tank can be equipped with a booster pump to meet the most unfavorable point of the fire hydrant and nozzle pressure. In fact, this is the meaning of the understanding of the meaning of the fire tank, so that the fire tank into the middle of the pool, can not rely on gravity to the water supply pipe system.