Installation of refrigeration pipes in food purification plants
Installation of refrigeration pipes in food purification plants
The commonly used materials for refrigeration pipes are copper pipes and seamless steel pipes. Ammonia pipes are all made of seamless steel pipes, and copper pipes or other non-ferrous metal pipes cannot be used. The characteristics of seamless steel pipes are uniform texture, high strength, Easy to process, the inner wall is slippery; the seamless steel pipe has thin wall and thick wall...
Text label: food purification plant, installation of refrigeration pipes, design and decoration of food purification pharmaceutical cleanroom
Installation of refrigeration piping in food purification plant
The commonly used materials for refrigeration pipes are copper pipes and seamless steel pipes. Ammonia pipes are all made of seamless steel pipes, and copper pipes or other non-ferrous metal pipes cannot be used. The characteristics of seamless steel pipes are uniform texture, high strength, Easy to process, the inner wall is slippery; the seamless steel pipe is divided into thin-walled and thick-walled. Generally, thin-walled steel pipes are used in refrigeration devices, which are divided into cold-drawn and hot-rolled pipes. Cold-drawn pipes have small diameters and hot-rolled pipes. Large diameter. In order to ensure the precise connection between pipes, the bending of pipes is difficult to avoid in refrigeration engineering. The methods are divided into hot bending and cold bending. Cold bending is carried out on a special pipe bending machine. Heat the tube, and then bend the tube manually or mechanically; the bending radius of the tube is 4-5d, and a larger bending radius should be used for the large tube. Don't worry, generally 5-6d is used as the bending radius, and there are generally three ways to connect pipes: welding, threaded connection and flange connection.
The welding of pipes can be electric welding, silver brazing, copper welding, etc. It is suitable for red copper pipes and seamless steel pipes; silver brazing is best for the welding of red copper pipes, because silver brazing has a low temperature during welding. The flow performance of the solder is good; the butt welding of the copper pipes of the same diameter should be in the form of insertion welding. Press tightly to prevent the solder from flowing into the pipe from the gap during welding. It is best to place the pipe vertically during welding; the seamless steel pipe is generally welded by electric welding, and gas welding should not be used, because the stress of gas welding is difficult to eliminate, and the butt welding method can be used. Welding can be carried out only after it has been processed into a suitable groove in advance; repair welding cannot be carried out under the condition of pressure in the pipeline system, otherwise the operation is not safe and the repair welding quality is not good; the paint and rust on the surface should be removed before repair welding. Layer, and wipe with emery cloth; threaded connection is used for copper pipe, flange connection is used for seamless steel pipe, these two connection methods can be dismantled. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for food purification projects and purification workshops.
When installing the pipeline, check the cleanliness of the inlet and outlet joints of each component. These joints are sealed before leaving the factory. If the seal is found to be damaged, it is best to blow it with compressed air for reliability; The welding slag should be carefully removed from the welded pipes to facilitate cleaning and leak detection; the diameter of each pipe should be equipped according to the specifications required by the product manual or equipment, and should not be arbitrarily changed to ensure the necessary The pressure resistance strength and the small loss of pipeline flow resistance, especially the freon liquid supply pipe, cannot be arbitrarily reduced. If it is too small, the pressure drop will increase, and it is easy to cause gas flashing in front of the expansion valve; the length of the connecting pipe should be shortened as much as possible. Reduce unnecessary elbows, which can reduce the loss of flow resistance, and save materials and labor. The elbow should be processed by a pipe bending machine or a pipe bending tool to ensure that the elbow is smooth and flat, and the throttle valve should be as close to the evaporator as possible. , in order to reduce the loss of cooling capacity; the connecting pipe should be equipped with anti-vibration measures, and the longer connecting pipe should be supported by a shelf to avoid vibration damage or bumping. When connecting the larger pipe with the equipment, it is strictly required to be vertical and horizontal, so that the refrigerant is in a straight line. To reduce vibration due to movement, pipe sleeves should be installed when the hot and cold pipes pass through the wall; for parallel equipment, the piping must be arranged symmetrically, so that the liquid supply is uniform, and the pipes should be arranged neatly and beautifully.
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