Cleaning of Pipe Fittings (三）
4. Precautions for pickling
(1) Welding of the pipe is completed before pickling;
(2) When disassembling, transporting and pickling, be careful not to touch the pipe, threads and sealing surfaces, and use tape or plastic pipe to plug the seal;
(3) The welding slag, spatter and varnish on the pipe should be removed before pickling;
(4) Each threaded part should be protected by acid-resistant materials such as plastic tape and rubber tape, or the threads should be coated with dry oil after degreasing and water washing before removing rust in the acid solution to prevent acid erosion;
(5) Be careful not to make the pipe fit marks disappear or blur when pickling.
