What are the requirements for fire water pipes?

First, high fire water tank fire pipe

1. The feed line

(1) The pipe diameter should meet the requirement that the fire tank is filled with water in 8h, but should not be less than DN32. It is appropriate to set the liquid level valve or float ball valve.

(2) The height of the lowest point of the water inlet port above the overflow edge should be equal to the diameter of the water inlet pipe, but the minimum should not be less than 100mm and the maximum should not be more than 150mm.

2. The outlet pipe

(1) Outlet pipe diameter should not be less than DN100.

(2) the lowest effective water level of the high fire tank should be determined according to the water horn and prevent the inundation depth of the cyclone. When the outlet pipe horn is used, the inundation depth under the lowest effective water level should be determined according to the water speed and water conditions of the suction pipe horn, but should not be less than 600mm; When using the anti-cyclone should be determined according to the product, but should not be less than 150mm protection height.

3. The overflow pipe

(1) The diameter shall not be less than 2 times the diameter of the inlet pipe, and shall not be less than DN100.

(2) the diameter of the flare of the overflow pipe should not be less than 1.5-2.5 times the diameter of the overflow pipe.

Two, outdoor fire water supply pipeline

1. The fire water supply pipe shall be divided into several independent sections using valves, and the number of internal and outdoor fire hydrants in each section shall not exceed 5.

2. The diameter of the outdoor fire water supply pipe should not be less than DN100 or DN150 if necessary.

3. Buried pipeline when the system working pressure is not greater than 1.20MPa, it is appropriate to use ductile iron pipe or steel wire mesh skeleton plastic composite pipe water supply pipeline, when the system working pressure is greater than 1.2mpa and less than 1.6mpa, it is appropriate to use steel wire mesh skeleton plastic composite pipe, thickened steel pipe, and seamless steel pipe when the system working pressure is greater than 1.6mpa, Seamless steel pipe should be used.

Three, the indoor fire water supply pipeline

1. The pipe network of the indoor fire hydrant system should be arranged in a ring. When the design flow of the outdoor fire hydrant is not more than 20L/s and the number of indoor fire hydrants is not more than 10, it can be arranged in a branch shape.

1) When supplying water to two or more buildings.

2) Temporary high-pressure fire water supply system with a high-level fire water tank is adopted.

3) When supplying water to two or more water fire extinguishing systems.

4) When supplying water to an automatic water extinguishing system controlled by two or more alarm valves.

2. The design flow rate of the fire water supply pipeline should not be greater than 2.5m/s. The design flow rate of the automatic water fire extinguishing system pipeline should meet the relevant provisions of current national standards, but the water flow rate of any fire pipeline should not be greater than 7m/s.

Four, the water supply network inspection

1. The pipe support and hanger materials are generally made of Q235 common carbon steel profiles unless otherwise specified in the design documents.

2. The holes on the pipe support and hanger shall be processed by an electric drill, and the holes shall not be cut by oxyacetylene.

V. Pipeline connection mode

1. Flexible joints should be used in places with vibration and buried pipelines, rigid joints should be used in other places. When rigid joints are used, a flexible joint should be set for every 4-5 rigid joints, and stainless steel bolts and nuts should be used in the buried connection.

2. The mechanical three-way hole spacing should not be less than 1m, and the mechanical four-way hole spacing should not be less than 2m.

6. Connection of overhead pipelines

1. When the fire water supply pipe passes through the load-bearing wall or foundation of the building, an opening should be reserved. The height of the opening should ensure that the clearance at the top of the pipe is not less than the settlement of the building, not less than 0.1m, and should be filled with impermeable elastic materials.

2. When the fire supply pipe passes through the wall or floor, a bushing should be installed. The length of the bushing should not be less than the thickness of the wall, or it should be 50mm higher than the floor or ground.

3. Red paint or a red ring mark should be painted outside the overhead pipe. The width of the red ring mark should not be less than 20mm, the interval should not be more than 4m, and the ring should not be less than two places in an independent unit.

Seven. Installation of pipe support and hanger

The following parts shall be equipped with fixed support or anti-sway support:

(1) The water distribution pipe should be equipped with an anti-sway support at the midpoint, which is not required when the pipe diameter is less than DN50.

(2) Water distribution pipe and water distribution pipe, the length of the water distribution branch pipe exceeds 15m, at least one anti-sway support should be set within every 15m length, when the pipe diameter is not greater than DN40, no.

(3) The pipe diameter greater than DN50 should be equipped with anti-swing support at the turning, three-way, and four-way positions.

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