Cooling pipe using seamless steel tube should be used as welding, in addition to use when connected to the equipment, valves flanged or threaded connection.
Gas welding using diameter less than 5omm, diameter greater than 5omm using welding. Pipe welding is commonly used in refrigerator, only when necessary in terms of installation and maintenance, flanged or threaded connection is used. Using convex surface flat welding flange square flange or kidney-shaped flange, when flange connection, gaskets with a thickness of 1 ~ 3mm oil rubber asbestos, and modulation of graphite coated with oil. When threaded connection, you should use gasoline or kerosene to clean the oil on the threads, and then coated with glycerol to reconcile gluten feed or Teflon tape as a seal packing, prohibited the use of lead as flax oil and seal packing.
Freon refrigeration pipe diameter is less than 25 mm with copper pipe, there are several connection methods.
（1）成品铜片。插座类型的界面形式，钎焊连接。
（2）插座通过铜钎焊连接，退火应首先加热模具插座，插座直径应大于插入管的外径0.25〜0.5mm，插座有效深度可以大等于管径，安装方向看介质流量。
(3)法兰连接。根据设计要求uirements and the specific circumstances, pipeline installation works can be used for copper and copper alloy pipe flange loose flange, welding ring loose flange and welded flange, welded flange connection form.
specification, Standard and identification焊接钢管（用焊接制造的钢管）是由平板制成的管状产品，称为Skelp，形成，弯曲并为焊接制备。
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