Carbon steel pipe pickling method currently are used in the construction and management of two trough pickling pickling inner loop. 

(1) trough pickling. The installed piping removed after decomposition into pickling bath soak treatment after passing their secondary installation. This method is suitable for larger diameter tube short, straight, easy to disassemble, piping and a small amount of on-site piping system hydraulics hydraulic piping construction of small amounts of occasions, such as pumping stations, valve stations inside, can be used trough pickling method. 
(2) pipe loop pickling. In the installed hydraulic components in the hydraulic lines disconnected or removed with a hose, receivership, rinse cover joints, constitute rinse loop. Acid pump acid into the circulating loop pickling. The pickling method is more advanced construction technology in recent years, with the pickling speed, good effect, the process is simple, easy to operate, reducing pollution on the human body and the environment, reduce labor intensity and shorten the pipeline installation period, resolve long lines and complex piping pickling difficult problem, and to avoid secondary pollution problems trough pickling easy assembly occurs, has been widely used in the construction of large hydraulic system piping. 

Pickling formula and process piping will cause unreasonable tube wall can not be completely ex oxide, wall over corrosion, corrosion of the pipe wall and the tube again residual chemical reactions sediment and other phenomena.