【 Weak current College 】 sprinkler system nozzle selection and application-of-Power By 【 China power house network 】

Automatic sprinkler system nozzle selection and application of 1 nozzle classification according to the different documents at home and abroad. Nozzle generally can be divided into six categories. Design according to the fire risk, the protection space of the building construction, sprinkler system itself features to select nozzle. Specific types broken down as follows: 1) in accordance with the nozzle is blocked, you can put the nozzle into open and closed sprinkler nozzles. Remove all closed sprinkler components and sealing components of htm is open type nozzle. Only the water curtain spray nozzle is open type nozzle special case; 2) according to the sprinkler installation method can be divided into vertical, ptosis and side-wall. Both upright and hanging installation of the nozzle as ordinary nozzles; 3) according to the size of the drops of water sprinkler nozzles can be divided into classic and sprinkling water sprinkler. Water sprinkler for splash plate diameter is large, has greater cloth water area: and very little compared to the traditional sprinkler head wet ceiling sprinkler spacing may be appropriate to increase. Water sprinkler, another striking feature is the large droplet diameter, water droplets to values for diameter . 8mm, frequency of 1.05; while the traditional sprinkler, the value of the particle size of 0. 35mm, frequency 0.58; 4) water distribution curve, i.e. the head of the largest protected area, can be divided into standard nozzle and extended coverage nozzle. For the risk level in I l-class, standard nozzle for maximum protection in an area of 5m2 12 £ ®, and extended coverage nozzle of maximum protection area up to 1m2 37.; 5) in accordance with the nozzle htm component response speed, you can put the nozzle into the quick response sprinklers, Special nozzle and standard nozzle. Rapid reaction nozzle first in the 1970s to the residence. Into the 1980s and the warehouse. Then developed ESFR sprinkler head early suppression fast reaction. Rapid reaction nozzle of RTI is less than 50 (m · s) 1, 2, Special nozzle of RTI is 50-80 (m · 8) l, 2, standard nozzle of RTI is 80-350 (m · 8) 1/ 2; 6) under the nozzle outlet flow coefficient or outlet diameter, is divided into small nozzle, standard nozzle (K = 80, 5mm 12.) and large diameter nozzle, flow coefficient up to 360 K. As can be seen from the above classification. Our specifications require flow coefficient K = 80 sprinkler as standard nozzle has certain limitations. Standard nozzle should be described from three aspects: first, the nozzle flow coefficient K = 80: second nozzle thermal index Rrll, 80-350 (m · s) l, 2: 3 nozzle cloth water curve that is main, and maximum protection area. 2 nozzle selection and application of the selection and application of the nozzle should be under protection of sites of fire risk, the protection space of the building construction, sprinkler system itself. And nozzle flow coefficient, thermal index of RTI and maximum protection area. In a real project design, you should consider the following issue: 1) in the absence of suspended ceiling and upright sprinkler should be used. Only in this way. The hot air heating nozzle early contact and heat-sensitive components. Place in a suspended ceiling. Nozzle should be used drop-ceiling sprinkler nozzles or. Otherwise. Ceiling will stop the sprinkler distribution; light hazard class, the risk level in residence (home or hotel) and the Office may use the side wall sprinkler; 2), light hazard class establishments and the protection of life places suitable for miningWith the quick response sprinklers. Such as. Public entertainment, residential, Atrium ring Gallery, hospitals, infirmaries Ward and the treatment area, the elderly, children, disabled persons of collective activities, etc. And serious danger in the event of a fire burning acceleration of fast, quick release large amounts of heat. Because of the rapid reaction nozzle on more sensitive, can cause large nozzle opening. Enabling open nozzle over design level. Result in insufficient water jet strength. Actual water spray jet strength is less than the required strength. To achieve fire. Additionally, for setting is not appropriate to capture heat of the nozzle. You can use the quick response sprinklers and shelf the built-in shower and so on. Quick response sprinklers and heat source distance see under the table: quick reaction nozzle and a small amount of heat from the paste (mm), heat General sprinkler temperature levels in sprinkler temperature level open or closed fire edge of 914 305 closed fire 1524 in front of 914 gas or 1067 wood furnace 305 kitchen range, fireplaces, hot of air flow 457 229 uninsulated 305 hot tubs 152 hot air diffuser on wall or ceiling installation 607 of the edge 305 hot air diffuser wall mounting 914 in front of 457 hot water heater 152 or 76 Leuchten 0- 250 W 152 76 lamp 250- 499 W 305 152 3) warehouse and other dangerous places can be specially certified quick response sprinklers. If early suppression fast reaction (ESFR) nozzle. ESFR sprinkler is only dedicated sprinkler warehouse. not to big space, and other non-warehouse premises. But the shelf should be built nozzles quick reaction nozzle. Big drops of water sprinkler is standard nozzle and ESFR sprinkler transition products. Usually used to warehouse, currently in the works of General is no longer used; 4) when the protection of water jet strength 12L less/min · m2, or by calculation, nozzle pressure greater than 0.15MPa. The use of flow coefficient larger standard nozzle, aims to reduce water pressure pumps. Save investment; 5) extended coverage nozzle is used only for the ceiling, or ceiling smooth no obstructions light hazard class or I-level in dangerous places, it should not be lower than the Jet strength <自动喷水灭火系统设计规范> (GB50084-2001) requirements of the table 5.1.1 and protection area and spacing should be specially certified: 6)-dry, preaction system should be used in upright sprinkler or dry hanging-type nozzle. In order to prevent system piping to water, reduction of localized corrosion and other pipeline is detrimental to the system of actions factors; 7) fireproofing curtain should adopt open sprinkler, water curtain spray nozzle, or both the above two nozzle; protection of water cooling water curtain can adopt or dedicated sprinkler nozzles (such as glass curtain wall dedicated sprinkler), closed nozzles; 8) same compartment can be used for heat-sensitive, flow coefficient same nozzle. However, when partially heat source, allow use of high temperature level. In the hotel rooms and corridors of small, small permitted use flow coefficient; nozzle 9) closed sprinkler nominal action temperature should be higher than the ambient temperature 30 ° c. In some parts of the heat received are not appropriate, you can use a low temperature level, such as nozzles 57 degrees centigrade nozzle. In the local temperature higher parts, use temperature rating higher nozzles; 10) used to protect steel roof truss of the closed-head should be nominal action temperatureW:st = "on" UnitName = "° c" SourceValue = "141" HasSpace = "False" Negative = "False" NumberType = "1" TCSC = "0" > 141 ° c sprinkler head. ESFR sprinkler and extended coverage nozzle should be installed in the roof or ceiling smoothing. When there is a slope roof, the roof slope not greater than 16.7%; rain protection zones should be used in the same nozzle; vulnerable to collision parts should be used with the protective shield of nozzle or ceiling sprinkler.