Corrosion prevention method for short metal pipe

Abstract

The invention relates to a corrosion prevention method for a short metal pipe. The method is characterized by comprising the following steps of: manufacturing a stainless steel cylinder of which the internal diameter is matched with the external diameter of the short metal pipe by using a stainless steel plate, sleeving the stainless steel cylinder on the outer wall of the short metal pipe, performing pipe expansion on the short metal pipe by using a mechanical pipe expansion method to form close fit between the stainless steel cylinder and the short metal pipe, and securely welding a port of the stainless steel cylinder and the outer wall of the short metal pipe. The method has the advantages that: the method is simple; the close fit is formed between the stainless steel plate and the short metal pipe, and one port of the stainless steel cylinder is securely welded with the outer wall of the short metal pipe, so that the stainless steel plate is more securely combined with the short metal pipe, and the phenomenon that the stainless steel plate is expanded open by pressure water can be avoided even though a welded junction between the stainless steel cylinder and the short metal pipe has an open welding point to realize long-term corrosion prevention.

Description

technical field [0001] The invention relates to an anticorrosion method for a short metal pipe, in particular to an anticorrosion method for a sleeve core pipe of a buried compensator, and belongs to the technical field of metal pipe anticorrosion. Background technique [0002] Sleeve compensators are often used in heating pipe networks to solve the problem of thermal expansion and contraction of pipelines and eliminate pipeline stress. At the same time, sleeve compensators are required to have reliable sealing performance, durability and low frictional resistance. [0003] The sleeve compensator is mainly composed of three parts: the outer sleeve, the sealing letter and the core tube. Generally, the outer sleeve and the sealing letter are fixed as a whole to compensate for the relative movement of the core tube. The smoothness and corrosion resistance of the surface of the core tube directly affect the sealing performance of the compensator. [0004] There are mainly two ...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is: the stainless steel plate and the core tube are not tightly bonded, and the compensator is easy to cause damage to the girth welds on both sides when the compensator moves, which affects the normal operation of the compensator

In addition, in use, the welds on both sides of the stainless steel plate often have some solder joints cracked, so that water invades between the stainless steel plate and the outer wall of the core tube, because the water is under pressure, and both ends of the stainless steel plate are connected to the core tube ( Metal short pipe) welding, the pressure of water will accumulate during the welding, and eventually the stainless steel plate will expand and lose its anti-corrosion effect

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