GB 50974-2014Technical code for fire protection water supply and hydrant systems (English PDF)

1.0.2 This Code applies to the design, construction, inspection and maintenance

management of fire water and fire hydrant systems of the new construction, expansion and renovation of industrial, commercial and municipal construction.

1.0.3 The design, construction, inspection and maintenance of fire water and hydrant systems should follow the relevant national policies, and effective technical measures should be taken combined with engineering features to achieve safety, reliability, advanced technology, low-cost and utility, and environment protection.

1.0.4 The components and equipment of the fire water and hydrant system used in project shall be products complying with the requirements of existing national standards and access system.

1.0.5 The design, construction, inspection and maintenance of the fire water and hydrant system shall not only comply with this Code, but also should be consistent with existing national standards.

2.1 Terms

2.1.1 Fire water

Water sources that provide fire water to water fire-extinguishing facilities, vehicle-carried or hand-carried and other mobile fire pumps, fixed fire pumps, including municipal water supply, fire reservoir, gravity fire reservoir and natural water sources.

2.1.2 Constant high-pressure fire protection water supply system

The water supply system that always keeps the working pressure and flow required by the water fire-extinguishing facilities and pressurizes directly without a fire pump in fire.

2.1.6 Gravity fire reservoir

The water storage facility set in a high place that directly provides gravity water supply for water fire- extinguishing facilities.

2.1.7 Elevated / gravity fire tank

The water storage facility set in a high place that directly provides gravity water demand in initial fire disaster for water fire-extinguishing facilities.

2.1.11 Static pressure

The pressure at a point of the pipe in static in the fire water system pipe network, referred to as static pressure.

2.2 Symbols

3.1 General requirements

3.1.1 The outdoor fire water demand of factories, warehouses, storage yards, storage tank area or civil buildings should be determined according to the number of fires at the same time and the outdoor fire water required for extinguishing a fire. The number of fires at the same time should meet the following requirements.

3.1.2 The design flow rates of the fire water required for extinguishing a fire should consist of the design flow rates of the various water fire-extinguishing systems that need to function at the same time, including building outdoor fire hydrant system, indoor fire hydrant system, automatic sprinkler system, foam extinguishing system, water spray system, fixed fire monitor extinguishing system, fixed cooling water system, and should meet the following requirements.

3.2 Fire flow rates for town

3.2.1 Fire flow rates for town shall be calculated and determined according to local fire

statistics, firefighting water demand statistics, fire water demand guaranteed rate, building composition, municipal water supply network running rationality and other factors based on comprehensive analysis.

3.3 Fire flow rates of outdoor hydrant for building

3.3.1 Fire flow rates of outdoor hydrant for building should be determined based on a

comprehensive analysis according to the building function, volume, fire rating, fire risk and other factors.

3.4.7 The fire flow rates of full pressure, semi-frozen and full frozen liquid ammonia tank shall be determined based on calculation according to the requirements of full pressure and semi-refrigerated storage tank in Article 3.4.5 of this Code, but the spray intensity shall be not less than 6.0L/ (min - m2) for calculation, and the fire flow rates of the cooling water system of full frozen liquid ammonia tank should be calculated according to the requirements that the full frozen liquefied hydrocarbon tank is a single containment tank with steel outer wall.

4.1 General requirements

4.1.1 Within the scope of urban and rural planning area, municipal fire water should

be planned, designed and implemented synchronously with municipal pipe network.

4.1.2 The fire water quality should meet the functional requirements of water extinguishing facilities.

4.2 Municipal water supply

4.2.1 When the municipal water supply network provides continuous water, the municipal water supply network may be used to supply water directly for the fire water supply system.

4.3.2 Calculation of the effective volume of fire water should meet the following

requirements.

4.4 Natural water and others

4.4.1 Wells and other groundwater sources can be used as fire water.

4.4.2 If a well supplies water directly to the fire water system as fire water, its most

unfavorable water level should satisfy the water absorption requirements of the pump, and the minimum flow and the pump head should meet the fire requirements;

4.4.4 If the outdoor fire water is natural water, technical measures should be taken to prevent ice, float, suspended solids and other substances from clogging the fire pump and to ensure the safety of taking water.

4.4.5 If natural water is used as the fire water, it should meet the following

requirements.

5.1 Fire pump

5.1.1 The type of fire pump should be determined based on the reliability, installation site, fire water, fire water flow rates, head design and other factors, the pump drive should be direct drive by motor or diesel engine, and the fire pump should not be dual-powered type with double motors or based on diesel engine.

5.1.6 The selection and application of fire pump shall meet the following requirements.

5.1.7 The main materials of fire pump shall comply with the following requirements.

5.1.10The fire pumps should be provided with standby pumps, with performance consistent with that of the work pump, except for the following construction.

5.1.12 Fire pump suction should meet the following requirements.

5.2.5 The cells of elevated fire tanks should be well-ventilated, not frozen, and should be provided with anti-freezing measures when it is necessary to set in non-heating rooms in frost, cold places and places frozen in winter, with ambient temperature or water temperature not less than 5°C.

5.3 Makeup pump

5.3.1 The makeup pump is preferably centrifugal pump and should meet the following requirements.

5.3.2 The design flow rates of makeup pump should meet the following requirements.

5.3.4 The temporary high-pressure fire protection water supply system of makeup pump should be provided with technical measures to prevent the makeup pump starting and stopping frequently;

5.3.5 The suction pipe of makeup pump should be provided with a clear bar gate valve, and the outlet pipe should be provided with a muffler check valve and clear bar gate valve.

5.4 Fire department connection

5.5.15 The earthquake proof of independent fire pump room should meet local seismic requirements and seismic measures should be taken according to local earthquake proof intensity with 1 degree increased,

5.5.16 Fire pumps and control cabinets should be provided with security measures.

6.1 General requirement

6.1.1 The fire water supply system should be based on building function, size, height, fire rating, fire risk, importance, secondary disasters, business continuity, water conditions and other factors to determine its reliability and type of water supply, and should meet the flow and pressure required by water extinguishing systems.

6.1.3 Building outdoor should be provided with low pressure fire protection water

supply systems and should meet the following requirements if supplied by a municipal water supply network.

6.1.4 The outdoor fire water of process unit areas, storage tank areas, storage yards and other structures should meet the following requirements.

6.1.8 The high-pressure or temporary high-pressure fire protection water supply system should be used indoor and should not be combined with the production and domestic water supply system;

6.1.12 If the municipal water supply network can meet the production and domestic

water and the fire flow rates, and the municipal administration permits direct suction of fire pumps, the fire pumps of temporary high-pressure fire protection water supply system should draw water directly from the municipal water supply network, but the town and municipal fire flow rates should be greater than the sum of the fire flow rates of indoor and outdoor for building.

6.2 Vertical zone of water supply

6.2.5 If reduced pressure tank is used for vertical zone of water supply, the following

requirements should be met.

7.1 Types of system

7.1.1 The municipal hydrants and building outdoor hydrants should be wet fire hydrant system.

7.1.2 A wet hydrant system should be used in places with indoor environment temperature not below 4 °C and not above 70 °C.

7.2 Municipal hydrant

7.2.1 Municipal hydrants should be outdoor ground fire hydrant; in frost, cold places

and places frozen in winter should be provided with dry outdoor fire hydrants and severe cold areas should be additionally provided with fire water cranes.

7.2.3 Municipal fire hydrants should be provided on the side of roads, appropriately

close to the crossroads; but if municipal roads are wider than 60m, municipal fire hydrants should be intersected on both sides of the road.

7.2.7 The valves of municipal water supply network should be convenient for the use and maintenance of municipal hydrants, and shall comply with the relevant provisions of the current national standard Outdoor Water Supply Design Specifications GB 50013.

mark.

7.3 Outdoor hydrant

7.3.1 The arrangement of building outdoor hydrant shall not only comply with the provisions of this Article, but also the relevant provisions of Article 7.2 of this Code.

7.3.2 The number of building outdoor hydrant should be determined based on the fire flow rates of outdoor fire hydrant and protection radius; the protection radius shall not be greater than 150.0m and the outflow of each outdoor hydrant should be l0L/s~15L/s for calculations.

7.4 Indoor hydrant

7.4.1 The type of indoor hydrant should be determined according to the user, fire risk, different fire extinguishing function and other factors.

7.4.2 The indoor hydrant configuration should meet the following requirements.

7.4.3 Each storey of the buildings equipped with indoor hydrants, including the device storey, shall be provided with hydrants.

7.4.11 The water required by fire hose reel and portable fire hose may not be included in the total amount of fire water.

7.4.16 The indoor hydrant system of city traffic tunnels should meet the following requirements.

8.1 General requirements

8.1.1 When the municipal water supply network is equipped with a municipal fire

hydrant, the following requirements shall be met.

8.1.2 The following fire water supply shall use loop water supply pipe network;

8.1.3 The main water duct supplying water for outdoor and indoor loop fire water supply pipe network shall not be less than two. When one of it fails to work, the rest of them shall be still able to meet the design flow of the fire water supply.

8.1.7 The water supply pipe network of indoor fire hydrant system shall be arranged separately with automatic water sprinkler fire extinguishing system and other fire extinguishing systems; when the firefighting pump is used at the same time, the water supply pipeline shall be arranged separately before the alarm valve along with the flow direction.

8.2 Pipeline design

8.2.1 The working pressure rating of the equipment, tools, pipefittings, valves and accessories and system components used in fire water supply system shall be larger than the system working pressure of the fire water supply system and the system shall be ensured to be able to run safely and reliably at the possible maximum operation pressure.

8.2.4 The buried pipeline shall be made from ductile iron pipe, steel wire Skeleton plastic composite pipe, reinforced corrosion proof steel pipes and other pipes.

8.2.5 When the system working pressure of the buried pipeline is not larger than 1.20MPa, it is suitable to use water supply pipeline made from ductile iron pipe or steel wire Skeleton plastic composite pipe;

8.2.10 The overhead water-filled pipes shall be arranged in the area with ambient temperature being not less than 5°C.

9.1 General requirements

9.1.1 Fire water drainage measures shall be taken to construction projects of fire

water supply system.

9.2 Fire protection drainage

9.2.1 Fire water drainage measures shall be taken for the following buildings and locations.

9.2.3 The drainage facilities in the bottom hole of the fire elevator shall meet the following requirements.

9.2.4 Technical measures shall be taken for indoor fire water drainage facilities to prevent the flowing backward.

9.3 Drainage of system commissioning and testing