Thread Content
Connection technology for copper pipes in compensator systems In building water supply systems, copper pipes are mainly connected using either compression fittings or welding. 1. The bayonet connection is convenient and straightforward to use; by selecting the right accessories, the connection can be made airtight, preventing leaks and allowing it to withstand sufficient pressure. Clamshell connections are divided into two types: non-operable connectors of type A and operable connectors of type B. For type A connectors, the installation process involves selecting a sleeve that matches the specifications of the pipe, cutting the pipe to the correct length, removing all burrs, and checking whether the pipe ends are clean and free of deep scratches or other defects. If the end of the tube is elliptical, use appropriate tools to round it out, then insert the tube into the sleeve until it reaches the retaining ring. Tighten the nut by hand and with a wrench until the clamping ring secures the tube; at this point, the nut on the sleeve cannot be turned by hand. Now use two wrenches to tighten the nut by 1/3 to 2/3 of a turn. This causes the compression ring to bite into the tube, resulting in slight deformation of the tube. Operable joint type B: This joint can clamp both the inner and outer surfaces of the pipe, allowing it to provide support while also securing the copper pipe tightly. The connection method involves verifying that the specifications of the pipe and the sleeves used are correct, then cutting the pipe to the desired length using a fine-toothed saw. The burrs on the inside and outside are cleaned off, compression nuts and rings are fitted over the pipe ends, and the appropriate flaring tool or punch is used to expand the pipe ends. Finally, the tubular element is properly inserted into the pipe ends and sleeves, and the compression nuts are tightened. First twist it by hand, then tighten it with a wrench for about a week, and a secure and tight joint will be created. II. There are mainly two welding methods: soldering and brazing. The difference between the two lies in the different metal fillers used, the different fluxes, and the different applications. Performing these welding methods requires personnel with professional qualifications. Soldering 1) Before connecting the pipes, it is necessary to verify once again that the specifications and dimensions of the pipes and fittings meet the requirements for connection ； 2) According to the design drawings, the length of the piping is measured on-site to ensure accurate cutting. Cutting can be performed vertically using a rotary pipe cutter, or a steel saw or electric saw with no fewer than 13 teeth per centimeter. After cutting, the burrs at the pipe ends should be removed and the edges rounded off. 3) The brazing strength is low, and lap joints are generally used for the welds. The lap length is 6 to 8 times the wall thickness of the pipe; when the outer diameter of the pipe is 28 mm or less, the lap length is (1.2 to 1.5)D (mm). 4) Before welding, the outer wall of the copper tube at the welding site and the inner wall of the fitting should be brushed with fine sandpaper, steel brushes, or sandpaper containing other abrasives to remove surface oxides ； 5) Apply the paste-like or liquid flux evenly to the cleaned outer surface of the pipe and the inner surface of the fittings ； 6) Insert the copper tube into the fitting, push it all the way in and rotate it slightly to maintain a uniform gap, then wipe away any excess flux from the extruded seam ； 7) Use a gas welding flame to evenly heat the joint until it reaches the brazing temperature ； 8) Use a filler metal to make contact with the joint that has been heated to a high temperature. When the temperature at the copper pipe joint is high enough to cause the filler metal to melt rapidly, it indicates that the temperature at the joint has reached the soldering temperature; at this point, heating can continue while the filler metal is added until the solder joint is fully filled ； 9) Remove the flame and allow the joint to cool and crystallize in a stationary state ； 10) Clean the residue at the joint thoroughly.