Cathode protection system for underground pipeline system

Abstract

A cathode protection system for an underground pipeline system is composed of a feeder cable (401), a feed connector (402) and a sacrificial anode (7), wherein the lower end of the feeder cable (401) and the outer wall of an underground pipeline (1) are fixedly connected through the feed connector (402) and are electrically connected, the sacrificial anode (7) is fixedly connected on the other end of the feeder cable (401); a waterproof sleeve (5) is placed in an outer protecting pipe (2), the feed connector (402) is fixedly distributed at the front end of the waterproof sleeve (5), and the feed connector (402) and the underground pipeline (1) are fixedly welded; and the sacrificial anode (7) is specially electrically connected with the electric connection through the feeder equipment (4) and the underground pipeline (1), and finally the cathode protection system for the underground pipeline system is constituted. The cathode protection system for the underground pipeline system provided by the invention is a systems engineering, and relates to more contents; and the degree of maturity of the technology is high, so that the cathode protection system for the underground pipeline system has an expectable great economic value and an expectable great social value.

Description

Technical field [0001] The invention relates to the scientific field of underground pipeline protection technology, and in particular provides a cathodic protection system for underground pipeline systems. Background technique [0002] In the prior art, the use of large-diameter steel water pipelines has the advantages of safety, reliability and short construction period, and is currently a relatively common method in water transmission projects. The process is mainly to embed the pipe jacking and burying through the operation between the working shafts. Except for the working shaft, other pipelines are routed through the ground without ground excavation. It is difficult to completely solve the problem of the durability of the pipe jacking pipeline by using the traditional corrosion protection process, and to give the pipeline durability. Sexual design and construction technology bring new problems. Judging from the current situation of the pipe jacking pipelines that have been ...

AI Technical Summary

Problems solved by technology

[0009] 1) Reserve corrosion allowance: use thick-walled large-diameter steel pipes, and rely on the corrosion allowance of the steel itself to meet the design life requirements. This method requires a lot of steel resources, and the manufacturing and installation costs are high, and the construction period is long. Professional pipe-making equipment, there are still many mechanical problems for large-diameter steel pipe jacking

In addition, the steel pipe jacking with only corrosion allowance may produce unpredictable damage due to localized corrosion and stress corrosion in soil corrosion environment

At the same time, at present, my country rarely has the ability to mass produce large-diameter ultra-thick-walled steel pipes.

[0010] 2) Corrosion-resistant alloy steel: In the past 50 years, material scientists have developed a variety of corrosion-resistant low-carbon alloy steel and stainless steel, including 10CrMoAl, 304, 316L and 00Cr26Ni7Mo2Ti, etc., although its corrosion rate is more than 2 times lower than that of ordinary carbon steel, However, the welding process is complicated, and it is easy to cause serious pitting corrosion, galvanic corrosion, stress corrosion, etc. in the welding part and heat-affected zone, thereby reducing the overall safety of the structure used, and the cost is also high

[0022] 2. Problems faced by corrosion protection of steel pipe jacking

However, the traditional sacrificial anode cathodic protection method follows the burying of the sacrificial anode during the pipeline laying process, but this method cannot be implemented for the grass-sand top pipeline of the non-excavation construction

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