GB 50370-2005 Code for Design of Gas Fire Extinguishing Systems

General Provisions

• 第 1.0.1 条Clarify that this code applies to the design of gas fire extinguishing systems installed in new, renovated, a…
• 第 1.0.3 条It is stipulated that the design of gas fire extinguishing systems shall follow the fire protection policy of…
• 第 1.0.4 条Emphasize that the extinguishing agent used in the design must not cause secondary contamination to the prote…
• 第 1.0.5 条The design of gas fire extinguishing systems shall, in addition to complying with this code, also comply with…

Terminology

• 第 2.1.1 条Gaseous fire extinguishing system: a system composed of extinguishing agent, actuation device, selector valve…
• 第 2.1.2 条Protected area: A limited space that meets the requirements of a gas fire extinguishing system, can be closed…
• 第 2.1.3 条Total flooding extinguishing system: A fire extinguishing system that discharges a certain concentration of e…
• 第 2.1.4 条Local application fire extinguishing system: a fire extinguishing system that directly sprays extinguishing a…
• 第 2.1.5 条Extinguishing concentration: the minimum volume percentage of a gaseous fire extinguishing agent in air requi…
• 第 2.1.6 条Inerting concentration: the minimum volume percentage of a gaseous fire extinguishing agent required to rende…
• 第 2.1.7 条Soaking time: the time required to maintain the design concentration of extinguishing agent in the protected …
• 第 2.1.8 条Pressure relief opening: an opening used to release excess pressure inside the protected area when the exting…
• 第 2.1.9 条Actuation device: equipment used to trigger the release of extinguishing agent in a gas fire suppression syst…
• 第 2.1.10 条Selector valve: In a combined distribution system, a valve used to control the flow of extinguishing agent to…

System design

• 第 3.1.4 条Protected zone division : A protected zone should preferably be divided as a single enclosed space; when the …
• 第 3.1.5 条Protected zone area and volume : When a piped extinguishing system is used, the area of a single protected zo…
• 第 3.1.6 条Fire resistance and pressure relief : The fire resistance rating of the enclosure structure, doors and window…
• 第 3.1.7 条Pressure relief opening setup : The protected area should be equipped with a pressure relief opening, prefera…
• 第 3.1.8 条Ventilation and air conditioning : The fans and fire dampers in the protected zone shall close automatically …
• 第 3.1.9 条Opening closure : Openings in the protected area (such as doors, windows, and pipe wall penetrations) shall b…
• 第 3.1.10 条Evacuation and signage : The protected area shall have passages and exits that ensure personnel can evacuate …
• 第 3.1.11 条Automatic control and manual control : The protected area shall be equipped with a fire audible alarm, and a …
• 第 3.1.12 条Interlock control : When the fire extinguishing system is activated, openings, ventilation, air conditioning …
• 第 3.1.13 条Standby power : The system shall have standby power and shall be capable of ensuring normal system startup an…
• 第 3.1.14 条Activation methods : A pipe network fire extinguishing system shall be provided with three activation methods…
• 第 3.2.1 条Agent selection : CO₂ fire suppression systems should not be used in hotels (due to asphyxiation risk); hepta…
• 第 3.2.2 条Design concentration : The design concentration of a heptafluoropropane fire suppression system shall not be …
• 第 3.2.4 条Soaking time : The soaking time for solid surface fires should not be less than 10 min; for liquid fires, not…
• 第 3.3.1 条IG541 design concentration : The design concentration of an IG541 fire suppression system shall not be less t…
• 第 3.3.2 条Discharge time : The discharge time of the IG541 fire extinguishing system shall not exceed 60s and shall not…
• 第 3.3.3 条Soaking time : The soaking time for solid surface fires should not be less than 10 min; for liquid fires, not…
• 第 3.4.1 条Prefabricated fire suppression system : The number of prefabricated fire suppression units installed in a sin…
• 第 3.4.2 条Charging pressure : For pre engineered fire suppression system units within the same protected area, the char…
• 第 3.4.3 条Actuation Mode : Pre engineered fire suppression systems shall be provided with both automatic and manual act…

System Design

• 第 3.2.3 条Discharge time : The discharge time of a heptafluoropropane fire suppression system shall not exceed 10 s (te…

Pipe network calculation

• 第 3.1.4 条Design agent quantity : For gas fire extinguishing systems in hotel buildings (such as HFC 227ea, IG541), the…
• 第 3.1.5 条Pipe network layout : The pipe network should adopt a balanced system to reduce pipe length and diameter diff…
• 第 3.1.6 条Sprinkler layout : Sprinklers shall be evenly arranged to ensure uniform distribution of extinguishing agent …
• 第 3.1.7 条Pipe material and connection : Pipes in hotel buildings should be seamless steel pipes or galvanized steel pi…
• 第 3.1.8 条Pipe strength and tightness : After the pipe network is installed, a hydrostatic strength test (1.5 times the…
• 第 3.1.9 条Flow velocity limit : The flow velocity of the extinguishing agent in the pipe shall not exceed 15 m/s (HFC 2…
• 第 3.1.10 条Filling pressure and storage : Storage containers (e.g., cylinder rooms) should be located in a dedicated roo…
• 第 3.1.11 条Startup Modes : Hotel buildings should adopt three startup modes—automatic control, manual control, and mecha…

Operation and Control

• 第 6.0.1 条The gas fire extinguishing system shall have three activation modes: automatic control, manual control and me…
• 第 6.0.2 条When automatic control activation is used, a manual control device shall be provided. The manual control devi…
• 第 6.0.3 条When a pipe network fire extinguishing system is used, three activation modes shall be provided: automatic co…
• 第 6.0.4 条The operation and control of the gas fire extinguishing system shall include the closing of openings in the p…
• 第 6.0.5 条When the combined distribution system is activated, the selector valve for the corresponding protected zone s…
• 第 6.0.6 条The power supply for the gas fire extinguishing system shall comply with the relevant provisions of the curre…
• 第 6.0.7 条In areas equipped with a gas fire extinguishing system, self contained breathing apparatus should be provided…
• 第 6.0.8 条Evacuation routes and exits within the protected area shall be provided with emergency lighting and evacuatio…
• 第 6.0.9 条Fire suppression system protection signs and gas release indicator lights shall be installed at the entrance …
• 第 6.0.10 条Manual control and emergency operation buttons of the fire extinguishing system shall be provided with warnin…

Safety requirements

• 第 6.0.1 条The protected area of a gas fire extinguishing system shall have passages and exits that ensure personnel can…
• 第 6.0.2 条Emergency lighting and evacuation indication signs shall be provided for evacuation routes and exits within t…
• 第 6.0.3 条Doors to the protected area shall open in the direction of egress and be self closing; doors used for egress …
• 第 6.0.4 条After fire extinguishing, the protected area shall be ventilated and air changed. For underground protected a…
• 第 6.0.5 条Spaces equipped with gas fire extinguishing systems should be provided with air breathing apparatus.
• 第 6.0.6 条A fire suppression system protection sign and a suppression agent discharge indicator light shall be provided…
• 第 6.0.7 条The extinguishing design concentration or actual use concentration in an occupied protected area shall not ex…
• 第 6.0.8 条The charging pressure of the pre engineered fire extinguishing system installed in the protected area shall n…
• 第 6.0.9 条The protected area shall have walkways and exits that allow personnel in the area to evacuate completely with…
• 第 6.0.10 条The evacuation doors within the protected area shall open in the direction of evacuation and be capable of au…
• 第 6.0.11 条Manual control and emergency operation of the fire extinguishing system shall have warning indications and me…
• 第 6.0.9 条In the above clauses, 6.0.10 and 6.0.11 supplement or refine clauses 6.0.1, 6.0.3, 6.0.6, etc., and must be s…
• 第 6.0.1 条As a densely occupied public building, hotels should pay particular attention to clauses such as (evacuation …

Engineering reference only — verify against project conditions and the latest codes.