【 Weak current College 】 automatic fire extinguishing systems in machinery garage of---Power By 【 China power house network 】

[Abstract] this article through a mechanical parking equipment high pressure CO2 extinguishing system design, applications, and concentrates on system design, system composition, operation modes and features, and so on; thus, in order to resolve garage fire-fighting system settings provides reference. 1. introduction of mechanical garage, a good solution to urban congestion, parking problems. Mechanical parking is a new building, room no lanes and no staff to stay in, the use of machinery and equipment for vertical or horizontal movement, parking garage. Taking their fire risk, the analysis of the causes of the garage fire, automobile fuel leaking fuel diffusion formed combustible gas, car circuit caused by fire, aggregation of electrostatic spark discharge, there is a mechanical parking internal electrical circuit. In the event of fire, automobile leather combustion, fire, burning fiercely, spread faster; also will cause an explosion. If not controlled in time, the loss will be very serious. So you want to increase the corresponding three-dimensional garage fire facilities. Based on the mechanical garage fire risk, can be seen, both A class of fire and the nature of the class b fire and mechanical parking structure — overall to a higher vertical space, easy to form a chimney effect, fire vertical spread faster, so use all submerged gas fire extinguishing system is ideal. Mechanical parking no personnel stay, high-pressure carbon dioxide fire extinguishing system is a better choice. Carbon dioxide by asphyxia and cooling effect, reducing the oxygen content in air, the lower the temperature of the combustion, fire-fighting. Carbon dioxide has toxicity is low, not deface the protected material and the environment, does not destroy the ozone layer, the price is low, good insulating properties. Possible security application, advanced technology, reasonable economy. 2. Overview of the project instance works were two garage, garage for steel structure, as well as the power plant. Garage high 23.9 m each garage 26 parking spaces, two parking spaces on each floor, 1.61 meters high. Belonging to class garage Ⅳ. Internal structure for fire retardant paint. High-pressure carbon dioxide fire extinguishing system of the second reserve respectively second parking, system optimization for a combined distribution system. 3. system based on the specification standard high-pressure carbon dioxide fire extinguishing system is based on the following normative standards for design, installation and acceptance of: (1) the CO2 fire-extinguishing system design code GB50193-99; (2) the automatic fire alarm system design code GB50116-98; (3) the automatic fire alarm system construction and acceptance of GB50116-92; (4) the gas fire extinguishing system construction and acceptance of GB50263-97; (5) the industrial metal pipe construction and acceptance of GB50235-97; (6) the garage, garage, parking design fire protection standard "GB50067-97. 4. system design 4.1 design conditions this design approach by all submerged in the fire. Design Jet on time is not greater than 1min. This system of room temperature storage of Jet flow during storage pressure on average as a basis for calculating 5.17MPa.
21 ° c temperature storage design nozzle inlet pressure of not less than 1.4MPa. System working pressure is 15MPa, using 70L cylinder group, CO2 filling rate 0.6kg/L, in the protection zone settings independent of automatic fire alarm system.
4.2 pipeline and nozzle design this system network in accordance with the standpipe along the garage two diagonal laid vertically upward, from the top to the bottom of the engine room through the garage. Parking at each level of each riser has a radial side spray nozzles, each garage located 15 only nozzle, a total of 30 only nozzle. Each of the standpipe took equipotential ground lightning and electrostatic protection measures.