This standard specifies the general rules, terminology, basic parameters, fire water source and water supply equipment of fire water supply and hydrant system.
Application, water supply form, fire hydrant system, pipe network, fire fighting and drainage, hydraulic calculation, control and operation, construction, system debugging and
Requirements for design, construction and maintenance management, such as acceptance and maintenance management, are given in the appendix.
Record requirements. The main technologies for formulating this specification are as follows:
1, supplement and improve relevant clauses of fire water supply and fire hydrant system;
2, warehouses and civil buildings according to the number of fires according to the size of the construction area, when the construction area is equal to more than 500000 m.
2 o'clock, calculated according to 2 fires;
3. The design flow of urban fire water supply is revised and accumulated according to the basic flow 15L/s, but the maximum value remains unchanged.
According to100 l/s;
4. The design flow of outdoor fire hydrant in the building is determined according to the volume ratio; Minimum design flow of outdoor fire hydrant in building
Adjust it to 15L/s, and adjust the relevant data according to the fire risk; Industrial buildings such as outdoor transformers and air compressor stations have been supplemented and improved.
Design flow of the built outdoor fire hydrant; According to the fire risk, the design flow of indoor fire hydrants in Class C workshops and warehouses is increased;
5. Increase the fire duration of fire separation water curtain and protective cooling water curtain, and determine the time according to the principle of equivalent substitution;
6, increase the relevant content of fire water source, put forward the water quality of fire water source, supplement municipal water supply, fire pool, day.
However, as the technical regulation of fire fighting water source, the fire fighting pool adopts two water supply methods, and keeps replenishing water in case of fire.
When the fire protection requirements can be met, the effective volume of the fire pool should be determined according to the calculation, but it should not be less than1100m3, and it should not be less than 50m3 when only the fire hydrant system is set.
7. The selection, application, design, water and other technical requirements of centrifugal fire pump, diesel pump, axial flow pump and deep well pump have been added.
Pump flow and pressure detection requirements, technical measures for pump small flow overheating protection, etc.
8. Adjust the effective volume and setting height of the high-level fire water tank, and specify the pipe diameter of the outlet pipe of the high-level fire water tank.
Meet the effluent requirements of fire water supply design flow, and should not be lower than the technical requirements of DN 100; It is recommended to set a high position in the open air.
Safety requirements for fire water tanks;
9. According to the functional requirements of the fire water supply system, the determination principle and technical parameters of the pressure stabilizing pump of the fire water supply system are put forward.
10, put forward the design and safety requirements of fire pump room, and the calculation formula of water hammer in pump outlet pipeline;
1 1, which supplements and improves the selection and application principles and technical requirements of fire water supply mode and district water supply mode, and puts forward the elimination.
The maximum working pressure of the water supply system should not be greater than 2.40MPa, and the automatic sprinkler system and fire hydrant system are unified.
The partition pressure value is that the working pressure should not be greater than1.2mpa; ;
12. The selection and application principles of fire hydrant system are supplemented and improved, and it is proposed that the water filling time of dry fire hydrant system should not be too long.
5 minutes, 5 minutes, explaining the selection and technical parameters of quick-opening valve in dry system. Fixed municipal or outdoor hydrant water supply network
Pressure requirements: normal pressure should not be less than 0. 14MPa, and fire pressure should not be less than 0.10 MPa; ; Fire fighting water cranes have been added.
It is suggested that the fixed fire monitor should be installed in the areas that cannot be covered by outdoor fire hydrants, such as process units and tank farms. rule
When the decompression backflow preventer is installed on the fire water inlet pipe, an outdoor baffle should be installed in front of the decompression backflow preventer.
Fire bolt; The location of indoor fire hydrants is modified, and the requirement that indoor fire hydrants should be located in stairwells and rest platforms is supplemented. The minimum pressure value and maximum pressure value of indoor fire hydrant should not be less than 0.25MPa and 0.50MPa respectively, but when it is greater than 0.70MPa, a decompression device should be set.
13, which supplements and perfects the relevant contents of the fire water supply system pipe network and increases the determination of the design pressure of the fire water supply system.
Then, as well as the design content of the pipeline; The selection principle and design content of valves are added, and the requirements for setting automatic exhaust valve, water hammer eliminator and pressure reducing valve in the pipe network stipulate that the decompression backflow preventer must be set in a clean place that is not submerged by water.
14, which increases the content of fire fighting and drainage, and puts forward the technical requirements for fire fighting and drainage in common places and toxic and harmful places;
15, adding relevant contents of hydraulic calculation of fire water supply and fire hydrant system;
16, adding relevant contents of control and operation of fire water supply and fire hydrant system;
17, adding relevant contents of construction, commissioning, acceptance and maintenance management of fire water supply and hydrant system.