河南万发制冷系统管道安装和要求（Installation and requirements of Henan Wan refrigeration system piping）.doc

河南万发制冷系统管道安装和要求（Installation and requirements of Henan Wan refrigeration system piping） Introduce refrigeration system piping installation and requirements I. piping materials There are two kinds of pipes used in refrigeration engineering, steel pipe and copper pipe. Steel pipe is divided into seamless steel pipe and welded steel pipe two. The characteristics of the seamless steel tube is uniform texture, high strength, easy processing, smooth inner wall, with hot rolling and cold drawing of welded steel pipe; also called pipe joints, according to the surface treatment and has galvanized pipe and galvanized pipe branch. Hot rolled seamless steel tubes are often used in refrigeration engineering. The copper tube is divided into two kinds: pure copper pipe and yellow copper pipe. The characteristics of pure copper is a soft, flexible processing, corrosion resistance, wall smooth, but the strength was weak. More pure copper tubes are used in the refrigeration system. (1) freon refrigeration system pipe commonly used copper tube or seamless steel pipe, general diameter is less than 25mm the copper pipe, large diameter, seamless steel tube. Ammonia refrigeration system adopts seamless steel tube. When working temperature is lower than -40 degrees, low alloy steel pipe is adopted; brine pipe is not high pressure; galvanized steel pipe can be adopted; cooling water pipe is also galvanized steel pipe. (2) when using red copper during annealing, easy to produce oxide skin tube for removal of skin, use wire tied to cotton and dipped in gasoline, repeatedly washed, ready to use gasoline cleaning cotton, to pull clean so far. (3) and Freon ammonia refrigeration system valve, safety valve, pressure gauge and so on, are dedicated, by supporting manufacturers supply, can not be replaced. Two 、 cleaning the pipe before installation (1) the cooling pipes must be cleaned, cleaned and dried before being installed, and the pipes should be clean and free of moisture. (2) for the steel p