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GB 50219-2014: Code of design for water spray extinguishing systems
Status: Valid GB 50219: Evolution and historical versions
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Code of design for water spray extinguishing systems
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Code of design for water spray extinguishing systems
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Basic data | Standard ID | GB 50219-2014 (GB50219-2014) | | Description (Translated English) | Code of design for water spray extinguishing systems | | Sector / Industry | National Standard | | Classification of Chinese Standard | P16 | | Classification of International Standard | 13.220.10 | | Word Count Estimation | 137,149 | | Date of Issue | 10/9/2014 | | Date of Implementation | 8/1/2015 | | Older Standard (superseded by this standard) | GB 50219-1995 | | Quoted Standard | GB 50116; GB 50141; GB 50166; GB 50184; GB 50231; GB 50235; GB 50236; GB 50242; GB 50275; GB 50683; GB/T 985.1; GB/T 985.2; GB 5135.11; DL/T 5352 | | Regulation (derived from) | People's Republic of China Housing and Urban-Rural Development Ministry Bulletin No. 582 | | Issuing agency(ies) | Ministry of Housing and Urban-Rural Development of the People's Republic of China; General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China | | Summary | This Standard applies to new construction, expansion and renovation project designed to set water spray systems, construction, inspection and maintenance management. This specification does not apply to portable water spray fire extinguishing system or se | GB 50219-2014: Code of design for water spray extinguishing systems---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
1 General
1.0.1 This specification is formulated in order to reasonably design the water spray fire extinguishing system (or system for short), ensure its construction quality and use function, reduce fire hazards, and protect personal and property safety.
1.0.2 This code is applicable to the design, construction, acceptance and maintenance management of the water spray fire extinguishing system installed in new construction, expansion and reconstruction projects.
This specification does not apply to mobile water spray fire extinguishing devices or water spray fire extinguishing systems installed in transportation vehicles.
1.0.3 The water spray fire extinguishing system can be used to extinguish solid material fires, Class C liquid fires, beverage fires and electrical fires, and can be used for protective cooling of production, storage devices or loading and unloading facilities of combustible gases and Class A, B and C liquids.
1.0.4 The water spray fire extinguishing system shall not be used to extinguish fires that can cause combustion and explosion due to chemical reactions when contacted with water, and fires that water mist will cause obvious damage to the protected objects.
1.0.5 The design, construction, acceptance and maintenance management of the water spray fire extinguishing system shall not only comply with the provisions of this specification, but also comply with the provisions of the current relevant national standards.
2 Terminology and symbols
2.1 Terminology
2.1.1 water spray fire protection system water spray fire protection system
It is composed of water source, water supply equipment, pipeline, deluge alarm valve (or electric control valve, pneumatic control valve), filter and water mist nozzle, etc., spraying water mist to the protected object for fire extinguishing or protective cooling system.
2.1.2 transfer pipe
A pipeline that detects fires using closed nozzles and transmits signals using changes in air or water pressure.
2.1.3 supply intensity application density
The amount of water sprayed by the system to the unit protection area per unit time.
2.1.4 response time response time
The time from the start of the water supply facilities of the system to the spraying of water mist from the water mist nozzle at the most unfavorable point in the system.
2.1.5 spray nozzle
Under the action of a certain pressure, the water flow can be decomposed into water droplets with a diameter of less than 1mm in the set area, and the nozzles can be sprayed out according to the designed sprinkling shape.
2.1.6 effective range effective range
When the nozzle is spraying horizontally, the horizontal distance between the highest point of the water mist and the plane where the nozzle is located is perpendicular to the axis of the nozzle.
2.1.7 water spray cone water spray cone
The cone formed by the water mist within the effective range of the water mist nozzle.
2.1.8 Deluge alarm valves unit
It is a device composed of deluge alarm valve, solenoid valve, pressure switch, hydraulic alarm bell, pressure gauge and supporting general valves.
2.2 Symbols
B - the distance between the nozzle of the water mist nozzle and the protected object;
Ch——Haichen-William coefficient;
dj - the calculated inner diameter of the pipe;
dg—calculated inner diameter of throttle tube;
g - acceleration of gravity;
H——The head of the fire pump or the supply pressure of the system inlet;
Hk - the head loss of the decompression orifice;
Hg—the head loss of the throttling tube;
hz—the elevation difference between the water mist nozzle at the most unfavorable point and the system pipe entrance or the lowest water level of the fire pool;
∑h——The sum of the head loss along the system pipeline and the local head loss;
i - head loss per unit length of the pipeline;
K——The flow coefficient of the water mist nozzle;
k - safety factor;
L - the length of the throttle tube;
N—the calculated number of water mist nozzles required for the protected object;
n——the number of water mist nozzles sprayed at the same time after the system is started;
P - the working pressure of the water mist nozzle;
P0 - the working pressure of the water mist nozzle at the most unfavorable point;
Q——the flow rate of the deluge alarm valve;
q - the flow rate of the water mist nozzle;
qi - the actual flow rate of the water mist nozzle;
qg——the flow rate of water in the pipeline;
Qj——calculated flow rate of the system;
Qs——design flow rate of the system;
R—the radius of the bottom circle of the water mist cone;
S - the protection area of the protection object;
V - the flow rate of water in the pipeline;
Vk——the average flow velocity of water in the pipeline behind the decompression orifice;
Vg - the average flow velocity of water in the throttle tube;
W——design supply intensity of protected object;
θ ——the atomization angle of the water mist nozzle;
ξ ——local resistance coefficient of decompression orifice;
ζ ——The sum of the local resistance coefficients of the reducer and expander in the throttling tube.
3.1 Basic design parameters
3.1.1 The basic design parameters of the system should be determined according to the protection purpose and protection object.
3.1.2 The supply intensity and continuous supply time of the system should not be less than those specified in Table 3.1.2, and the response time should not be greater than those specified in Table 3.1.2.
Table 3.1.2 Supply intensity, continuous supply time and response time of the system
Continued Table 3.1.2
Note. 1 For the system adding water-based fire extinguishing agent, its supply strength shall be determined by tests.
2 Steel single-disc, double-disc and open compartment internal floating roof tanks shall be treated as floating roof tanks. Other internal floating roof tanks shall be treated as fixed roof tanks
3.1.3 The working pressure of the water mist nozzle should not be less than 0.35MPa when it is used for fire extinguishing; it should not be less than 0.2MPa when it is used for protective cooling, but it should not be less than 0.15MPa for Class A, B, B and C liquid storage tanks
3.1.4 Unless otherwise specified in this specification, the protected area of the protected object shall be determined according to its outer surface area and shall meet the following requirements.
1 When the shape of the protected object is irregular, it should be determined according to the outer surface area of the smallest regular shape containing the protected object.
2 The protection area of the transformer shall be determined by the outer surface area of the transformer oil tank except the area of the bottom surface, and shall also include the outer surface area of the radiator and the projected area of the oil conservator and oil sump.
3 The protection area of the cables laid in layers shall be determined according to the outer surface area of the smallest regular shape containing the cables as a whole.
3.1.5 The protection area of the liquefied petroleum gas bottle room shall be determined according to its use area, and the protection area of the liquefied petroleum gas cylinder storage, pottery altar or barrel wine storage shall be determined according to the building area of the fire compartment.
3.1.6 The protection area of the conveyor belt should be determined according to the upper surface area of the upward belt; the long-distance belt should be protected in sections, but the length of each section should not be less than 100m.
3.1.7 The protection area of an open container should be determined according to its liquid surface area.
3.1.8 For Class A and B liquid pumps, combustible gas compressors and other related equipment, the protection area shall be determined according to the projected area of the corresponding equipment, and the water mist shall envelop the sealing surface and other key parts.
3.1.9 When the system is used to cool Class A, B, and C liquid storage tanks, its cooling range and protection area shall meet the following requirements.
1 The above-ground fixed-roof storage tank on fire and the adjacent above-ground storage tanks within 1.5 times the diameter of the burning tank from the fire tank wall shall be cooled at the same time. When there are more than 3 adjacent above-ground storage tanks, the three larger tanks may Adjacent storage tanks calculate the cooling water consumption for fire fighting.
2 The floating roof tank on fire shall be cooled, and its adjacent storage tank may not be cooled.
3 The protection area of the fire tank shall be calculated according to the outer surface area of the tank wall, and the protection area of adjacent tanks may be calculated according to the outer surface area of the part that actually needs to be cooled, but shall not be less than 1/2 of the outer surface area of the tank wall.
3.1.10 When the system is used to cool full-pressure and semi-refrigerated liquefied hydrocarbon or similar liquid storage tanks, its cooling range and protection area shall meet the following requirements.
1 The fire tank and the adjacent tanks within 1.5 times the diameter of the fire tank from the fire tank wall shall be cooled at the same time; when there are more than 3 adjacent tanks, the fire cooling water consumption may be calculated based on the 3 larger adjacent tanks.
2 The protection area of the fire tank shall be calculated according to the external surface area of the tank, and the protection area of adjacent tanks shall be calculated according to 1/2 of the external surface area of the tank.
3.1.11 When the system is used to cool fully refrigerated liquefied hydrocarbon or similar liquid storage tanks, its cooling range and protection area shall meet the following requirements.
1 For single-containment tanks with steel outer walls, the ignition tank and adjacent tanks within the range of 1.5 times the diameter of the ignition tank from the ignition tank wall shall be cooled at the same time. The protection area of the fire tank shall be calculated according to the external surface area of the tank, and the protection area of adjacent tanks shall be calculated according to the sum of 1/2 of the external surface area of the tank wall and the external surface area of the tank roof.
2 For double-containment tanks without filling material between the concrete outer wall and the storage tank, the tank wall and roof of the fire tank and the roof of adjacent tanks within 1.5 times the diameter of the fire tank wall shall be cooled simultaneously.
3 As for the double-capacity tank filled with insulation material between the concrete outer wall and the storage tank, the tank roof of the fire tank and the roof of the adjacent tank within 1.5 times the diameter of the fire tank wall shall be cooled at the same time.
4 For a full-containment tank with a concrete outer wall, when the inlet and outlet of the pipeline are on the tank roof, the cooling range shall include the pump platform on the tank roof, and should include pipe belts and steel ladders.
3.2 Arrangement of nozzles and pipes
3.2.1 The number of water mist nozzles required for the protected object shall be calculated and determined according to Article 7.1.1 and Article 7.1.2 of this code based on the design supply intensity, protection area and characteristics of water mist nozzles.
Unless otherwise specified in this specification, the nozzles should be arranged so that the water mist can be sprayed directly to and cover the protected objects. If the requirements cannot be met, additional water mist nozzles should be installed.
3.2.2 The safe clear distance between water mist nozzles, pipelines and live (exposed) parts of electrical equipment should comply with the provisions of the current industry standard "Technical Regulations for Design of High-Voltage Power Distribution Devices" DL/T 5352.
3.2.3 The distance between the water mist nozzle and the protected object shall not be greater than the effective range of the water mist nozzle
3.2.4 The planar arrangement of water mist nozzles may be rectangular or rhombus. When arranged in a rectangular shape, the distance between the water mist nozzles should not be greater than 1.4 times the radius of the water mist cone bottom of the water mist nozzles; when arranged in a diamond shape, the distance between the water mist nozzles should not be greater than 1.7 times the water mist nozzles The radius of the bottom circle of the water mist cone. The radius of the bottom circle of the water mist cone shall be calculated according to the following formula.
In the formula. R—the radius of the water mist cone bottom circle (m);
B——the distance between the nozzle of the water mist nozzle and the protected object (m);
θ ——the atomization angle of the water mist nozzle (°).
3.2.5 When the protected object is an oil-immersed power transformer, the layout of the water mist nozzles should meet the following requirements.
1 Water mist nozzle protection shall be provided for the orifice of transformer insulator rising seat, oil conservator, radiator and oil sump;
2 The horizontal and vertical distances between water mist nozzles shall meet the requirements for the intersection of water mist cones.
3.2.6 When the protected objects are Class A, B, C liquid and flammable gas storage tanks, the distance between the water mist nozzle and the outer wall of the protected storage tank should not be greater than 0.7m.
3.2.7 When the protected object is a spherical tank, the layout of the water mist nozzles should meet the following requirements.
1 The nozzle of the water mist nozzle should face the center of the ball;
2.The water mist cones should intersect along the latitude direction and connect along the meridian direction;
3 When the volume of the spherical tank is not less than 1000m3, the water mist cones should intersect along the latitude direction, and should be connected along the meridian direction, but the distance between the ring pipes above the equator should not be greater than 3.6m;
4 The steel pillars of the spherical tank without a protective layer, the tank liquid level gauge, valves, etc. shall be protected by water mist nozzles.
3.2.8 When the protection object is a horizontal storage tank, the arrangement of the water mist nozzles should make the water mist completely cover the exposed surface, and the water mist nozzles should also be installed for protection of the tank liquid level gauge and valves.
3.2.9 When the protection object is cables, the water mist nozzles should be arranged so that the water mist completely surrounds the cables.
3.2.10 When the protection object is the conveyor belt, the arrangement of the water mist nozzles should make the water mist completely envelop the head, tail and upper surface of the upward belt of the conveyor on fire.
3.2.11 When the protected objects are indoor oil-fired boilers, electro-hydraulic devices, hydrogen-sealed oil devices, generators, oil circuit breakers, steam turbine oil tanks, and coal mill lubricating oil tanks, the water mist nozzles should be arranged around the top of the protected objects, and The water mist should be sprayed directly to and completely cover the protected object.
3.2.12 The system used to protect Class A, B, and C liquid storage tanks shall meet the following requirements.
1 The cooling water ring pipe of fixed roof storage tanks and internal floating roof storage tanks treated as fixed roof storage tanks should be arranged along a single ring at the top of the tank wall. The supply intensity shall be calculated twice as specified in Table 3.1.2 of this code.
2 When the wind resistance ring or reinforcement ring of the storage tank has no flow diversion facilities, a cooling water ring pipe shall be arranged under it.
3 When the cooling water ring pipe on the storage tank is divided into two or more arc-shaped pipe sections, the arc-shaped pipe sections should not be connected, and the water pipes should be connected from the outside of the fire dike, and the water inlet outside the fire dike should be connected separately. A control valve that can identify the opening and closing state is installed on the pipeline.
4 The cooling water standpipe shall be fixed on the tank wall with pipe clips, and the distance between them should not be greater than 3m.
The lower end of the standpipe should be equipped with a rust cleaning port, and the distance between the rust cleaning port and the top surface of the tank foundation should be greater than 300mm, and the length of the pipe section collecting rust should not be less than 300mm.
3.2.13 For systems used to protect liquefied hydrocarbon or similar liquid storage tanks and Category A, B, B, and C liquid storage tanks, the connection between the standpipe and the horizontal piping in the tank group shall be able to eliminate the stress caused by the settlement of the storage tank.
3.2.14 The distance between the ring pipe supports on the liquefied hydrocarbon storage tank should be 3m~3.5m.
4 System components
4.0.1 The products and components used in the system shall comply with the current relevant national standards. Products and components subject to compulsory certification in accordance with the law shall have valid certification documents that meet the requirements of the market access system.
4.0.2 The type selection of water mist nozzles should meet the following requirements.
1 To extinguish electrical fires, centrifugal atomization water mist nozzles should be used;
2 The water mist nozzles installed in indoor dusty places should be equipped with dustproof caps, and the water mist nozzles installed outdoors should be equipped with dustproof caps;
3 Centrifugal atomization water mist nozzle should be equipped with columnar filter
4.0.3 According to the provisions of Table 3.1.2 of this specification, the system with a response time not greater than 120s shall be equipped with a deluge alarm valve group, and the function and configuration of the deluge alarm valve group shall meet the following requirements.
1 The deluge alarm valve group receiving the electric control signal should be able to be opened electrically, and the deluge alarm valve group receiving the transmission pipe signal should be able to be opened hydraulically or pneumatically;
2.It should have remote manual control and on-site emergency mechanical start-up functions;
3 The opening and closing status of the deluge alarm valve should be displayed on the control panel;
4.It is advisable to drive the hydraulic alarm bell to alarm;
5 Pressure gauges should be installed at the inlet and outlet of the deluge alarm valve;
6 A flushable filter should be installed before the solenoid valve.
4.0.4 When the system water supply control valve adopts electric control valve or pneumatic control valve, it shall meet the following requirements.
1 It should be able to display the open and closed state of the valve;
2.It should have the function of receiving the control signal to open and close the valve;
3 The opening time of the valve should not be greater than 45s;
4 It should be able to alarm when the valve fails, and display the cause of the failure;
5.It should have the function of on-site emergency mechanical start;
6 When the valve is installed in the valve well, the valve stem of the valve should be lengthened, and the electric actuator should be higher than the top of the well;
7 The pneumatic valve should be equipped with a reserve gas tank, and the volume of the gas tank can be calculated according to the gas volume required for opening and closing all the pneumatic valves connected to the gas tank for 3 times.
4.0.5 The pipeline in front of the deluge alarm valve should be equipped with a flushable filter, and the filter screen should be made of corrosion-resistant metal material, and the basic size of the mesh should be 0.600mm~0.710mm.
4.0.6 The water supply pipeline shall meet the following requirements.
1.The pipes between the filter and the deluge alarm valve and after the deluge alarm valve shall be hot-dip galvanized steel pipes, stainless steel pipes or copper pipes inside and outside; seamless steel pipes shall be used for pipes that need to be bent;
2 The working pressure of the pipeline should not exceed 1.6MPa;
3 When the system pipeline adopts galvanized steel pipe, the nominal diameter shall not be less than 25mm; when stainless steel pipe or copper pipe is used, the nominal diameter shall not be less than 20mm;
4.The pipes of the system shall be connected by grooved pipe fittings (clamps), flanges or threaded fasteners, and ordinary steel pipes may be welded;
5 For grooved pipe joints (clamps), the material of the shell shall be ductile iron with a grade not lower than QT 450-12;
6 The sealing rings of grooved pipe joints (clamps) and non-metallic flange gaskets in the protection zone shall pass the dry burning test specified in Appendix A of this specification;
7 A drain valve or drain outlet should be set at the lower part of the pipeline.
5 water supply
5.1 General provisions
5.1.1 The water for the system can be supplied by the fire pool (tank), fire water tank or natural water source, or it can be supplied by the stable high-pressure fire water supply system independently set up by the enterprise; the water volume of the system water source should meet the requirements of the maximum design flow rate and supply time of the system.
5.1.2 The fire pump room of the system should be built together with other water pump rooms, and should comply with the relevant current national standards for fire pump rooms.
5.1.3 In severe cold and cold regions, antifreeze measures should be taken for parts of the system that may freeze.
5.1.4 When the system is equipped with two or more deluge alarm valves, an annular water supply pipe should be installed in front of the deluge alarm valves.
5.1.5 The inlet and outlet pipes of reinforced concrete fire pools should be equipped with waterproof casings, and flexible joints should be added for pipelines with vibration; the inlet and outlet pipe joints of combined fire pools should be connected by flanges.
5.1.6 The setting of fire pressure water supply equipment shall meet the following requirements.
1 A check valve should be installed on the outlet pipe;
2 Maintenance passages should be set up around, and the width should not be less than 0.7m;
3 The distance from the top to the floor or beam bottom should not be less than 0.6m.
5.1.7 The place where the water spray fire extinguishing system is installed should be equipped with drainage facilities.
5.1.8 The overflow pipe and drain pipe of the fire pool shall not be directly connected with the drainage system of production or domestic water, and shall adopt the indirect drainage method.
5.2 Water pump
5.2.1 The water supply pump of the system should self-irrigate and divert water. When natural water is used for water supply, measures should be taken to prevent debris from clogging the suction port of the water pump. The water supply pressure of the system should meet the working pressure requirements of each component of the system within the corresponding design flow range, and measures to prevent system overpressure should be taken.
5.2.2 The system should be equipped with a spare pump, whose working capacity should not be less than the water supply capacity of the largest pump.
5.2.3 There should be no less than two water suction pipes for a group of fire pumps. When one of them is damaged, the remaining water suction pipes should be able to pass all the water; the water supply pump suction pipes should be equipped with control valves.
5.2.4 In the system where a ring pipe is arranged in front of the inlet of the deluge alarm valve, there should be no less than two outlet pipes of a group of water supply pumps; the outlet pipes should be equipped with control valves, check valves and pressure gauges.
5.2.5 The fire pump shall be provided with a test pump return pipe and an overpressure return pipe, and when conditions permit, the two may share one return pipe.
5.2.6 For fire pumps driven by diesel engines, the exhaust pipes of the diesel engines should lead to the outside.
5.3 Water supply control valve
5.3.1 The rain alarm valve group should be installed in a room with a temperature not lower than 4°C and drainage facilities. The deluge alarm valve installed indoors should be 1.2m away from the ground, the distance between the two sides and the wall should not be less than 0.5m, the distance between the front and the wall should not be less than 1.2m, and the distance between the protruding parts of the deluge alarm valve should not be less than 0.5m. Less than 0.5m.
5.3.2 Deluge alarm valves, electric control valves and pneumatic control valves should be arranged near the protected objects and convenient for safe operation by personnel.
5.3.3 Deluge alarm valves, electric control valves, pneumatic control valves and their pipelines installed outdoors in severe cold and cold areas shall adopt heat tracing and heat preservation measures.
5.3.4 In places where the water spray test cannot be carried out, the discharge test detection device shall be installed on the main water supply pipe after the deluge alarm valve, and its water passing capacity shall be consistent with the system's water passing capacity.
5.3.5 The hydraulic alarm bell should be installed on the external wall near the public passage or duty room, and valves for maintenance and testing should be installed. The deluge alarm valve and hydraulic alarm bell should be connected by hot-dip galvanized steel pipe, and its nominal diameter should not be less than 20mm. When the nominal diameter is 20mm, its length should not be greater than 20m.
5.4 Water pump adapter
5.4.1 The system installed indoors should be equipped with a water pump adapter.
5.4.2 The number of water pump adapters should be determined according to the design flow rate of the system, and the flow rate of a single water pump adapter should be calculated according to 10L/s~15L/s.
5.4.3 The water pump adapter shall be installed on the sidewalk or the non-motor vehicle driving section which is convenient for fire trucks to approach, and the distance from the outdoor fire hydrant or fire pool should be 15m to 40m.
5.4.4 The wall-type fire pump connector should be 0.7m away from the ground, and the clear distance from the door, window and opening on the wall should not be less than 2.0m, and should not be installed under the glass curtain wall.
5.4.5 The distance between the water inlet of the underground fire pump adapter and the bottom surface of the manhole cover should not be greater than 0.4m, and should not be smaller than the radius of the manhole cover, and waterproof and drainage measures should be taken in the well of the underground fire water pump adapter.
6 Operation and Control
6.0.1 The system should have three control modes. automatic control, manual control and emergency mechanical start; however, when the response time is greater than 120s, two control modes can be adopted. manual control and emergency mechanical start.
6.0.2 The design of the automatic fire alarm system linked with the system shall comply with the current national standard "Code for Design of Automatic Fire Alarm System" GB 50116.
6.0.3 When the system uses transmission pipes to detect fire, it shall comply with the following regulations.
1 The transmission pipe should be steel pipe, the length should not be greater than 300m, the nominal diameter should be 15mm-25mm, and the distance between the closed nozzles on the transmission pipe should not be greater than 2.5m;
2 Hydraulic transmission tubes should not be used for electrical fires;
3 In severe cold and cold regions, hydraulic transmission pipes should not be used; when compressed air transmission pipes are used, measures should be taken to prevent the accumulation of condensed water.
6.0.4 The system used to protect liquefied hydrocarbon storage tanks shall be capable of activating the deluge alarm valves of adjacent storage tanks that need to be cooled while activating the deluge alarm valve of the fire tank.
6.0.5 The system used to protect Class A, B, B, and C liquid storage tanks shall be able to activate the adjacent storage tanks that need to be cooled while starting the deluge alarm valve (or electric control valve, pneumatic control valve) of the fire tank. Deluge alarm valve (or electric control valve, pneumatic control valve).
6.0.6 For the section protection system of the conveyor belt, when the deluge alarm valve of the fire section is activated, it shall be able to activate the deluge alarm valve of the downstream adjacent section of the fire section, and shall be able to cut off the belt conveyor at the same time. power supply.
6.0.7 When the malfunction of the automatic water spray fire extinguishing system will adversely affect the protected object, the alarm signals of two independent fire detectors shall be used for interlocking control; For the same fire detector, the system should use the alarm signal of the fire detector and the circuit breaker signal of the transformer for interlocking control.
6.0.8 The control equipment of the water spray fire extinguishing system shall have the following functions.
1 Monitor the start and stop status of the fire pump;
2 Monitor the opening state of the deluge alarm valve and monitor the closing state of the deluge alarm valve;
3 Monitor the opening and closing status of electric or pneumatic control valves;
4 Monitor the automatic switching of the main and backup power sources.
6.0.9 The power source of the water supply pump of the water spray fire extinguishing system shall meet one of the following conditions.
1 Power supply for primary electrical loads;
2 The power source of the secondary electric load, and a diesel engine as backup power;
3 The main and backup power sources are all diesel engines.
7 hydraulic calculation
7.1 System Design Flow
7.1.1 The flow rate of the water mist nozzle should be calculated according to the following formula.
In the formula. q——the flow rate of the water mist nozzle (L/min);
P——the working pressure of the water mist nozzle (MPa);
K——The flow coefficient of the water mist nozzle, the value is provided by the nozzle manufacturer.
7.1.2 The calculated number of water mist nozzles required for the protection object should be calculated according to the following formula.
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