GB 50219-1995 Design specification for water spray fire extinguishing systems
Some standard content:
Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
50219-95
Code of design for water
spray extinguishing systems
Published on January 14, 1995
Implemented on September 1, 1995
State Bureau of Technical Supervision
Ministry of Construction of the People's Republic of China
Engineering Construction Standard Full-text Information System
Jointly Issued
Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
Code of design for water
spray extinguishing systems systems
GB50219—95
Editor department: Ministry of Public Security of the People's Republic of ChinaApproval department: Ministry of Construction of the People's Republic of ChinaEffective date: September 1, 1995
Engineering construction standard full text information system
Engineering construction standard full text information system
Notice on the release of national standard
"Design specification for water spray fire extinguishing system"Jianbiao [1994] No. 807
According to the requirements of the State Planning Commission's document [1987] No. 2390, the "Design specification for water spray fire extinguishing system" jointly compiled by the Ministry of Public Security and relevant departments has been reviewed by relevant departments. The "Design specification for water spray fire extinguishing system" GB5021995 is now approved as a mandatory national standard. It will be implemented on September 1, 1995. The Ministry of Public Security is responsible for the management of this standard, and its specific interpretation and other work are the responsibility of the Tianjin Fire Science Research Institute of the Ministry of Public Security, and the publication and distribution is organized by the Standard and Quota Research Institute of the Ministry of Construction.
Ministry of Construction of the People's Republic of China
January 14, 1995
Engineering Construction Standards Full-text Information System
Engineering Construction Standards Full-text Information System
c0000000000000
2 Terms and Symbols
00000000000000
2.2 Symbols
000000000010000000000000000
Basic Design Parameters and Nozzle Arrangement
Basic Design Parameters·
Nozzle Arrangement
System Components
Medium Capacitors Heart
Operation and control
Hydraulic calculation
c0c000cc00ccc.
Design flow of the system
Hydraulic calculation of pipelines
Measures for reducing the pressure on pipelines
1 Explanation of terms used in this specification
Appendix A
Additional explanation
Engineering construction standard full text information system
c0000000000005000000
Engineering construction standard full text information system
1 General
This specification is formulated in order to reasonably design the water spray fire extinguishing system, reduce the fire hazard, and protect the safety of people and property.
1.0.2 This specification is applicable to the design of water spray fire extinguishing systems installed in production, storage facilities or loading and unloading facilities in new, expanded and renovated projects. This specification is not applicable to the design of transportation vehicles or mobile water spray fire extinguishing devices. 1.0.3 The water spray fire extinguishing system can be used to extinguish fires of solids, liquids with a flash point higher than 60°C, and electrical fires. It can also be used for the protective cooling of production, storage devices, or loading and unloading facilities for flammable 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 cause combustion or explosions due to chemical reactions in contact with water, or fires in which water mist causes serious damage to the protected objects. 1.0.5
5 In addition to complying with the provisions of this specification, the design of the water spray fire extinguishing system shall also comply with the provisions of the relevant current national standards and specifications. Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Terms and Symbols
2.1 Terms
watersprayextinguishingsystem, water spray fire extinguishing system
A fire extinguishing system composed of a water source, water supply equipment, pipes, deluge valve groups, filters, and water mist nozzles, which sprays water mist to extinguish or protect and cool the protected objects. 2Transfer pipe transfer pipe
A pipe that uses closed nozzles to detect fire and transmits signals by using changes in air pressure or water pressure.
3Response time response time
The time from the fire alarm signal issued by the automatic fire alarm system to the water mist spraying out of the water mist at the most unfavorable point in the system.
2.1.4Spray nozzle spray nozzle
A nozzle that uses centrifugal or impact principles to decompose water into fine droplets under a certain water pressure.
Effective range of spray nozzle effective range of spray nozzle The distance between the highest point reached by the water mist and the nozzle when the water mist nozzle sprays horizontally. 2.1.6Water spray cone water spray cone
The cone formed by the water mist within the effective range of the water mist nozzle. 2.1.7 Deluge valve unit The deluge valve unit is composed of a deluge valve, a solenoid valve, a pressure switch, a hydraulic alarm, a pressure gauge and a matching general valve.
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Radius of the bottom circle of the water mist cone
Distance between the nozzle of the water mist nozzle and the protected object Atomization angle of the water mist nozzle
L/min·m2
Engineering Construction Standard Full-text Information System
Flow rate of the water mist nozzle
Working pressure of the water mist nozzle
Flow coefficient of the water mist nozzle
Calculated number of water mist nozzles for the protected object Protection area of the protected object
Design spray intensity of the protected object
Calculated flow rate of the system
Number of water mist nozzles spraying simultaneously after the system is started Actual flow rate of the water mist nozzle
Actual working pressure of the water mist nozzle
Safety factor
Head loss along the pipeline
Flow rate of water in the pipeline
Calculated inner diameter of the pipeline
Local head loss of deluge valve
Specific resistance of deluge valve
Flow rate of deluge valve
Calculated pressure of system pipeline inlet or fire water pump Sum of head loss along the system pipeline and local head loss Actual working pressure of water mist nozzle at the most unfavorable point Elevation difference between water mist nozzle and system pipeline inlet or lowest water level of fire water tank at the most unfavorable point
Engineering Construction Standard Full-text Information System
Basic design parameters and nozzle layout
3.1 Basic design parameters
The basic design parameters of water spray fire extinguishing system should be determined according to the protection purpose and protection object.
Protection against theft
Designed spray intensity and continuous spray time shall not be less than the provisions of Table 3.1.2: Designed spray intensity and continuous spray time
Protected objects
Solid fire
Liquids with a flash point of 60~120℃
Liquids with a flash point higher than 120℃
Oil-immersed power transformers, oil switches
Oil collection pits for oil-immersed power transformers
Class A, B, and C liquid production, storage, loading and unloading facilities Class A, B, and C||t t||Liquid storage tanks
Diameter below 20m
Diameter 20m and above
Flammable gas production, transportation, loading and unloading, storage facilities and bottling rooms, bottle meeting
Design spray intensity
(L/min·m)
Continuous spray
Time (）
3The working pressure of the water mist nozzle should not be less than 0.35MPa when used for fire extinguishing; 3.1.3
When used for protective cooling, it should not be less than 0.2MPa. 3.1.4The response time of the water spray fire extinguishing system should not be greater than 45s when used for fire extinguishing; it should not be greater than 60s when used for protective cooling of liquefied gas production, storage equipment or loading and unloading facilities; it should not be greater than 300s when used for protective cooling of other facilities. 5 The protection area of the object protected by the water spray fire extinguishing system shall be determined according to its surface area and shall comply with the following provisions: 3.1.5.1 When the shape of the protected object is irregular, it shall be determined according to the outer surface area of the smallest regular shape that contains the protected object;
3.1.5.2 The protection area of the transformer shall be determined according to the outer surface area of the transformer minus the bottom area, and shall also include the outer surface area of the oil pillow, cooler and the projected area of the oil collection pit;
3.1.5.3 The protection area of cables laid in layers shall be determined according to the outer surface area of the smallest regular shape that is contained as a whole.
3.1.6 The protection area of the filling room, loading and unloading platform, pump room, compressor room, etc. for flammable gases and Class A, B and C liquids shall be determined according to the use area. 3.1.7 The protection area of the conveyor belt shall be determined according to the upper surface area of the upward belt. 3.1.8
The protection area of the open container shall be determined according to the liquid surface area. 3.2 Nozzle Arrangement
1 The number of water mist nozzles for the protected object shall be calculated and determined according to the design spray intensity, protection area and characteristics of the water mist nozzles in accordance with Formula 7.1.1 and Formula 7.1.2 of this Code. The arrangement shall enable the water mist to directly spray and cover the protected object. If the requirements cannot be met, the number of water mist nozzles shall be increased.
The safe clearance between the water mist nozzle, pipeline and live (exposed) parts of electrical equipment shall comply with the provisions of the relevant current national standards. 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 plane arrangement of the water mist nozzle can be rectangular or rhombus. When arranged in a rectangular shape, the distance between the water mist nozzles shall not be greater than 1.4 times the radius of the bottom circle of the water mist cone of the water mist nozzle. When arranged in a rhombus shape, the distance between the water mist nozzles shall not be greater than 1.7 times the radius of the bottom circle of the water mist cone of the water mist nozzle. The radius of the bottom circle of the water mist cone should be calculated according to the following formula: 8
R=B·tg
Wherein, R is the radius of the bottom circle of the water mist cone (m); B is the distance between the nozzle of the water mist nozzle and the protected object (m); 0 is the atomization angle of the water mist nozzle (°). The value range of 0 is 30, 45, 60, 90, 120.
When the protected object is an oil-immersed power transformer, the arrangement of water mist nozzles shall comply with the following provisions:
The top;
The water mist nozzles shall be arranged around the transformer, and should not be arranged on the transformer3.2.5.2
The water mist protecting the top of the transformer shall not be sprayed directly onto the high-voltage bushing:3.2.5.3
The horizontal distance and vertical distance between the water mist nozzles shall meet the requirements of the intersection of the water mist cone;
3.2.5.4The oil pillow, cooler, and oil collection pit shall be protected by water mist nozzles.3.2.6When the protected object is a flammable gas and Class A, B, and C liquid storage tank, the distance between the water mist nozzle and the outer wall of the storage tank shall not be greater than 0.7m. 3.2.7 When the protected object is a spherical tank, the arrangement of water mist nozzles shall also comply with the following provisions: 3.2.7.1
1 The nozzle of the water mist nozzle shall face the center of the sphere,
2 The water mist cones shall intersect along the latitude and connect along the meridian; 3.2.7.2
When the volume of the spherical tank is equal to or greater than 1000m2, the water mist cones shall intersect along the latitude and connect along the meridian, but the distance between the ring pipes above the equator shall not be greater than 3.6m;
The steel pillars of the spherical tank without a protective layer and the tank body liquid level gauge, valve, etc. shall be protected by water mist nozzles.
3.2.8 When the protected object is a cable, the spray shall completely surround the cable. 9 When the protected object is the conveyor belt, the spray should completely surround the conveyor's head, tail, and up and down belts.
Type of work 6 Construction standard full text information system
Engineering construction standard full text information system
System componentswww.bzxz.net
4.0.1 Water mist nozzles, rain valve groups, etc. must be products that have been tested by the National Fire Product Quality Supervision and Inspection Center and meet the current relevant national standards. 4.0.2
2 The selection of water mist nozzles should meet the following requirements 4.0.2.1 Centrifugal atomization water mist nozzles should be used to extinguish electrical fires; 2 Anti-corrosion water mist nozzles should be used in corrosive environments; 4.0.2.2
4.0.2.3 Water mist nozzles installed in dusty places should have dust covers. 4.0.3 The functions of the deluge valve group shall meet the following requirements: 1. Connect or shut off the water supply of the water spray fire extinguishing system; 4.0.3.1
The deluge valve can be opened electrically by receiving the electric control signal, and can be opened hydraulically or pneumatically by receiving the transmission pipe signal;
It has a manual emergency operation valve;
It displays the open and closed status of the deluge valve,
It drives the hydraulic alarm;
It monitors the water supply pressure;
It should be equipped with a filter before the solenoid valve.
4.0.4 The deluge valve group should be installed in a room with an ambient temperature not lower than 4℃ and drainage facilities. Its installation location should be close to the protected object and convenient for operation. 4.0.5
The pipe before the deluge valve should be equipped with a filter. When the water mist nozzle has no filter, the pipe after the deluge valve should also be equipped with a filter. The filter screen should be made of corrosion-resistant metal material, and the aperture of the filter screen should be 4.0-4.7 mesh/cm2. 4.0.6 The water supply pipeline should meet the following requirements: 4.0.6.1
1 The pipeline after the filter should be made of galvanized steel pipe inside and outside, and it is advisable to use threaded connection;
No other water facilities should be installed on the pipeline after the rain valve; 4.0.6.3 A drain valve and a sewage outlet should be installed.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
The water for the water spray fire extinguishing system can be supplied by the municipal water supply network, the factory fire water supply network, the fire pool or the natural water source, and the water consumption should be ensured. 5.0.2
The water intake facilities of the water spray fire extinguishing system should take measures to prevent being blocked by debris, and the water supply facilities of the water spray fire extinguishing system in severe cold and cold areas should take anti-freezing measures.
Engineering Construction Standards Full Text Information System3
The directions should intersect and they should be connected along the meridian direction, but the distance between the ring pipes above the equator should not be greater than 3.6m;
The steel pillars of the spherical tank without protective layer and the tank level gauge, valve, etc. should be protected by water mist nozzles.
3.2.8 When the protected object is the cable, the spray should completely surround the cable. 9 When the protected object is the conveyor belt, the spray should completely surround the conveyor's machine 3.2.9
head, tail and up and down belts.
Type of work 6 Construction standard full text information system
Engineering construction standard full text information system
System components
4.0.1 Water mist nozzles, rain valve groups, etc. must be products that have been tested by the National Fire Product Quality Supervision and Inspection Center and meet the current relevant national standards. 4.0.2
2 The selection of water mist nozzles shall meet the following requirements 4.0.2.1 Centrifugal atomizing water mist nozzles shall be used to extinguish electrical fires; 2 Anti-corrosion water mist nozzles shall be used in corrosive environments; 4.0.2.2
4.0.2.3 Water mist nozzles installed in dusty places shall have dust covers. 4.0.3 The functions of the deluge valve group shall meet the following requirements: 1 Connect or shut off the water supply of the water spray fire extinguishing system; 4.0.3.1
The deluge valve can be opened electrically by receiving the electric control signal, and the deluge valve can be opened hydraulically or pneumatically by receiving the transmission pipe signal;
It has a manual emergency operation valve;
Display the open and closed status of the deluge valve,
Drive the hydraulic alarm;
Monitor the water supply pressure;
A filter should be installed before the solenoid valve.
4.0.4 The deluge valve group should be installed in a room with an ambient temperature of not less than 4℃ and drainage facilities. Its installation location should be close to the protected object and convenient for operation. 4.0.5
A filter should be installed on the pipe before the deluge valve. When the water mist nozzle has no filter, a filter should also be installed on the pipe after the deluge valve. The filter screen should be made of corrosion-resistant metal material, and the pore size of the filter should be 4.0-4.7 mesh/cm2. 4.0.6 The water supply pipeline should meet the following requirements: 4.0.6.1
1 The pipeline after the filter should be made of galvanized steel pipe inside and outside, and it is advisable to use threaded connection;
No other water facilities should be installed on the pipeline after the deluge valve; 4.0.6.3 A drain valve and a sewage outlet should be installed.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
The water used for the water spray fire extinguishing system can be supplied by the municipal water supply network, factory fire water supply network, fire water pool or natural water source, and the water supply volume should be ensured. 5.0.2
The water intake facilities of the water spray fire extinguishing system should take measures to prevent being blocked by debris, and the water supply facilities of the water spray fire extinguishing system in severe cold and cold areas should take anti-freezing measures.
Engineering Construction Standard Full Text Information System3
The directions should intersect and they should be connected along the meridian direction, but the distance between the ring pipes above the equator should not be greater than 3.6m;
The steel pillars of the spherical tank without protective layer and the tank level gauge, valve, etc. should be protected by water mist nozzles.
3.2.8 When the protected object is the cable, the spray should completely surround the cable. 9 When the protected object is the conveyor belt, the spray should completely surround the conveyor's machine 3.2.9
head, tail and up and down belts.
Type of work 6 Construction standard full text information system
Engineering construction standard full text information system
System components
4.0.1 Water mist nozzles, rain valve groups, etc. must be products that have been tested by the National Fire Product Quality Supervision and Inspection Center and meet the current relevant national standards. 4.0.2
2 The selection of water mist nozzles shall meet the following requirements 4.0.2.1 Centrifugal atomizing water mist nozzles shall be used to extinguish electrical fires; 2 Anti-corrosion water mist nozzles shall be used in corrosive environments; 4.0.2.2
4.0.2.3 Water mist nozzles installed in dusty places shall have dust covers. 4.0.3 The functions of the deluge valve group shall meet the following requirements: 1 Connect or shut off the water supply of the water spray fire extinguishing system; 4.0.3.1
The deluge valve can be opened electrically by receiving the electric control signal, and the deluge valve can be opened hydraulically or pneumatically by receiving the transmission pipe signal;
It has a manual emergency operation valve;
Display the open and closed status of the deluge valve,
Drive the hydraulic alarm;
Monitor the water supply pressure;
A filter should be installed before the solenoid valve.
4.0.4 The deluge valve group should be installed in a room with an ambient temperature of not less than 4℃ and drainage facilities. Its installation location should be close to the protected object and convenient for operation. 4.0.5
A filter should be installed on the pipe before the deluge valve. When the water mist nozzle has no filter, a filter should also be installed on the pipe after the deluge valve. The filter screen should be made of corrosion-resistant metal material, and the pore size of the filter should be 4.0-4.7 mesh/cm2. 4.0.6 The water supply pipeline should meet the following requirements: 4.0.6.1
1 The pipeline after the filter should be made of galvanized steel pipe inside and outside, and it is advisable to use threaded connection;
No other water facilities should be installed on the pipeline after the deluge valve; 4.0.6.3 A drain valve and a sewage outlet should be installed.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
The water used for the water spray fire extinguishing system can be supplied by the municipal water supply network, factory fire water supply network, fire water pool or natural water source, and the water supply volume should be ensured. 5.0.2
The water intake facilities of the water spray fire extinguishing system should take measures to prevent being blocked by debris, and the water supply facilities of the water spray fire extinguishing system in severe cold and cold areas should take anti-freezing measures.
Engineering Construction Standard Full Text Information System
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.