Pickling of carbon steel is chemically pickled pipeline, container oxides, rust and oil on the surface is removed, to obtain a metallic luster surface, to ensure the cleanliness of the pipe wall, while after pickling rust treatment also makes the bottom wall of the metal to be protected, to prevent further corrosion, pipeline pickling is a key pipeline construction. Pipeline pickling method more pickling method currently used in the construction site and has trough pickling acid cycle, the cycle is divided pickling pickling line and off-line pickling. Circulation pickling is a pipe or hose coupling union constitute a loop with an acid pump acid into the circulating pipe pickling. It can be installed without removing the pipe, as long as the hydraulic components can be carried out even better off with a hose, which is called pickling line cycle. As some of the short tube or pipe fittings should not form a loop in the installation position detached, local loop circulating pickling connected with a hose or fitting, which is called pickling line outside the circle.
General requirements for circulating acid leaching as follows:
(1) The right formula, that formula pickling solution to be able to fully clear the wall oxide by chemical action, and because they can not make the wall excessive corrosion and rust again.
(2) Reasonable pickling loop, to ensure every part of the wall can be thoroughly and evenly pickling clean.
(3) Rational process and strict rules and special operations team with timely processing problems pickling process, to ensure the smooth progress of the work of pickling.
(4) Pickling and after the water should be thoroughly purged, and promptly flushed with hydraulic oil to ensure oil evenly throughout the inner tube, to produce the inner tube to flush out all the flying objects and when pickling.
