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依据国家相关规范及设计手册规定，结合设计方案进行了各系统管线和设备的布置，绘制了平面图、系统图和卫生间给排水、泵房和各水箱大样图。并进行了各系统的设计计算，得到各系统所需的压力和流量，各管段的管径、坡度、标高等一系列参数，选定了水泵、水箱等设备和管道附件的型号。最后，通过校核验算，表明各方案设计合理，管道和设备的选择满足使用要求。
Design General Information
This works for a food factory building water supply and drainage engineering design. The food factory building height of 19.30 meters, a total of three floors; construction area of 20287.48m2; project total land area of 32792.30m2, with the nature of land for industrial use. The only design # 1 plant floor, and guard walls, power distribution room, pump room and garbage room and other five buildings, construction area of Building 20287.48m2.2、3 reserved for the post building.
The project of water supply pipe network access from the east side of the introduction of two DN300 municipal and forms of life and fire water pipe systems for base within in the land. Municipal water supply pipe is provided at the total water meter into the base at the municipal water pressure is 0.16Mpa.
The design of the current national design specifications as the basis, follow the principle of saving energy and water, and learn from the experience of existing projects, carried out indoor domestic water supply system, fire hydrant system, automatic sprinkler system indoor, indoor drainage systems, roof rainwater drainage system design and configuration of fire extinguishers. Among them, including the selection of water supply way design, water pumps and pipe diameter calculation and selection. Fire hydrant water supply including indoor and outdoor arrangement, layout and calculation of automatic sprinkler systems, fire water pipe diameter selection and pump selection. Drainage system including the drainage pipe, the diameter of the choice of layout and the corresponding hydraulic calculation, etc
For the purposes of the building, combined with the characteristics of the water system must be secure and fire requirements, taking into account the application of energy-saving and other factors, ultimately determine the following scenario.
Domestic water supply system by setting joint water supply of pumps, water tank, a layer of water directly by municipal pipe network, pressure 0.16Mpa; two or three water storage tanks and variable frequency pump way of life. Water pump water from the municipal networks, after being under pressure into the pump housing water tank, directly by the water pump housing water tank water supply; and green directly by municipal supplies, outdoor water supply pipe network (both for living and outdoor fire use) selection branch network layout. Fire hydrant system uses the temporary high pressure water; water source for municipal water from municipal water supply pipe out on two DN300 pipes for their introduction into the project. Urban pipeline plot a ring pipe network, for all of the project water supply. Water tank located on the roof, ground floor fire hydrants within the pump house pump supply, fire hydrant pumping water directly from the municipal water supply pipe network of indoor fire hydrants, valves should be set at a permanent fixed identity, buttons in the fire box should be equipped with protection of indoor fire hydrant water for 20L/s; 40L/s outdoor fire hydrant water consumption; fire life for 2H fire hydrant system. Automatically spray water fire system used wet type system, spray got pump set in ground a layer pump room within, pump from municipal tube network pumping, set a group alarm valve, control a layer of nozzle; by in the dangerous I level set, spray got distribution pipes entrance gate needed set with lock device; system water for 30L/s, automatically spray water fire system disaster continued time for 1h. Drainage system with sewage, wastewater sewer discharge normal single-pipe systems, in order to prevent sanitary appliances may splash on the first floor, design discharge their sewage and waste water on the first floor alone. Roof rain siphon rainwater drainage systems; roof rainwater design return period of 10 years; after the rainwater collected in roof rainwater to flow through vertical rain pipe to the outdoor water wells. Portable fire extinguishers with powder ammonium phosphate chemicals, based on the combined fire Cabinet or located inside fire extinguisher boxes; ground clearance should not be greater than the 1.5M at the top, bottom fork height should not be less than 0.08m, fire extinguisher boxes shall not be locked.