【 Weak current College 】 defense engineering design of fire water tank

Defense project is a feature more special civil engineering, it is necessary to meet the demands of wartime use functionality, but also in times of peace with a certain value, the defence must meet certain requirements of the fire. The defense works design fire protection standard "GB50016 — 2006 (hereinafter referred to as the" civil code ") on defense project of fire for a clearly defined, but the article" single built 7.6.3 digged, trenches, authentic defense project may not fire water tank "is worth exploring. Around the fire departments on this issue also has its own different interpretations.
L fire-fighting water kinds of design
At this stage in the fire protection design defense project, the General design of the fire water tank has the following two situations. ① attached-defense project design can be integrated into the surface buildings, its water tanks on the roof. ② single construction work type, trenches, tunnels-defense project, outdoor water supply network pressure, water meets the requirements of fire shelters, instead of having to set up water tanks: you should set up a reservoir and fire pumps, the tank height should meet the most negative point defense for hydrants or nozzle pressure requirements, or the set pressure water sharing equipment.
The pad specification section 7.3.2 stipulates: more than 1000m ~ in defense project must be set for automatic sprinkler system, and the country the sprinkler system design code GB50084-2001 (hereinafter referred to as the "self regulation"). The article since the regulation expressly provides that "article l0.3.1 adopts temporary high pressure water supply system of automatic sprinkler system, should be set high water tanks. "And now the vast majority of defence of the sprinkler system shall be provisional high pressure system, a fire water tank is essential. Obviously, this is the first defense specifications "section 7.6.3. Whether you need defense project set tank? this first from flowing water feature in the system.
2 in the form of spray system
Generally believed that fire water tank only supply water, not necessarily at the beginning of the fire. In the fire sprinkler design, generally based on the fire load, indoor space conditions, personnel are crowded, and the evacuation of the difficulty of the conditions set in places of fire rating and choose the form of water spraying system. To meet the requirements of the water-jet strength using different types of sprinklers, and in a certain space arrangement. Table 1 is used for wet systems to a square layout, on the different risk levels and different nozzle calculation data. From the table we can see that: (use of fire water tank water supply) nozzle pressure as water 0.05MPa, its strength ratio requirements were reduced by 30 ~ 60%, the water jet strength is not reliable. Therefore the water tank is not only to supply the initial role of fire, water and start a fire pump is the main function of the fire water tank. Or wet system, for example, main, and open the fire temperature, and pressure, water-related mainly to the flow meter and wet alarm valve Group (including hydraulic alarm and pressure switch). The Ministry of public security standard GA32-92 the sprinkler system flow indicator of performance requirements and test methods "section 5.8.1 article sensitivity requirements: alarm volume should be at 15L/min ~ S] 37.5L/min to any value between, ~ s] 37.5L/min to be alert. From product standards, fire water tank water supply, most unfavorable nozzle pressure 0.05MPa, standard nozzle flow 56L/min, meet the flow indicator work flow requirements. 89 the national standard GB797-sprinker system wet alarm valve performance requirements and test methods of: alarm valve for accurate alarm function of inlet pressure flow for 0.14MPa, 60L/min, and high water tank in the most negative point the nozzle over 15 ~ 20m, you can achieve this pressure and flow requirements that can reliably starts flowing system. From the above exposition of visible high-water tanks for starting the whole sprinkler system and provide the initial fire water is essential. Defense project located on the ground, the fire protection requirements should be more stringent, sprinkler system can start in a timely manner, for the entire project is critical, the importance of fire water tank.