LSAW steel pipe rust method

In the oil and gas pipeline anti-corrosion construction process, LSAW steel pipe anti-corrosion surface treatment is to determine the life of one of the key factors, it is LSAW steel pipe anti-corrosion layer and whether the combination of a solid premise. The study of professional organizations, in addition to the life of the coating depends on the type of coating,Coating quality and construction of environmental factors, LSAW steel pipe coating surface treatment of life-span of about 50%, therefore, should be strictly in accordance with standard coating the surface of LSAW steel pipe requirements, continuous improvement straight seam steel surface treatment method,LSAW steel pipe are mainly the following methods in addition to embroidery

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LSAW steel pipe symbol and acceptance

Sign
An outer diameter less than 36mm of LSAW steel pipe and shaped cross-section perimeter is less than 150mm of LSAW steel pipes, from time to print in mind.

2 outside diameter not less than 36mm of LSAW steel pipe and the cross-section shaped perimeter not less than 150mm of LSAW steel pipe, straight seam should be at each end of the pipe ends are printing, stamping, roll printing, stamp or mark paste . Mark should be clear and obvious, not falling. Mark should include the steel grade, the product rules

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The key issues of LSAW steel pipe anti-corrosion

LSAW steel pipe anti-corrosion key issues for the electrochemical corrosion of buried pipelines three processes, The anti-corrosion method of steel pipe from the start of a process in which inhibition. If the outer wall of the pipe plus anti-corrosion coating can increase the loop resistance and reduce corrosion current; external DC power supply, so that the soil pipe for causing negative potential, the formation of cathodic protection to eliminate potential difference between anode and cathode, anode fundamentally stop the process be. Anti-corrosion coating rule table, the cathodic protection of the rule of law. However, if the anti-corrosion coating damage, exposed iron parts will accelerate localized corrosion. Therefore, anti-corrosion coating and cathodic protection is a combination of methods to rid of this table, economical and effective. United States and other countries have clearly defined, using the anti-corrosion coating cathodic protection must be used.

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LSAW steel pipe features let it invincible position

LSAW steel pipe features: Longitudinal production process is simple. Low interest rates, rapid development. Plastic, spiral and standard classification: pressurized fluid transport spiral submerged arc welded pipe (SY5036-83 is mainly used for transporting oil, natural gas pipelines; pressure fluid transmission high-frequency welded spiral seam steel pipe (SY5038-83 lap welding method with high-frequency welding of the pressure fluid delivery for high-frequency welded spiral seam steel pipe steel tube strong pressure. to facilitate the welding and machining molding; generally low pressure liquid delivery spiral submerged arc welded pipe (SY5037-83 single-sided double-sided automatic submerged arc welding or welding into the legal system for water, gas, air and steam is generally low pressure liquid delivery such as submerged arc welding steel pipes In 2009, China's response to financial crisis, from time to time introduced the policy of economic comfort, steel users and traders of steel is expected to rebound in the market higher. all aspects of the survey show that the current inventory straight seam steel pipe not only restore the 2008 level, and on this basis, a further rise, "In 2009, the whole society of steel, Billet Straight seam steel pipe inventory increase equivalent to 30 million tons at present, social steel billet of high inventories, stabilize the steel market has been a threat to the Government issuing the credit limit the size of the steel industry, the credit crunch on the large steel straight seam steel pipe manufacturer impact limited little effect on steel prices.

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"LSAW steel pipe for transporting oil and gas expander key technologies and equipment" through the identification of science

In late March, the machine together experts in the Beijing Information Technology University of Beijing and China Petrochemical Group Jianghan Petroleum Administration Shashi Steel Pipe Plant have completed the "oil and gas expanded diameter LSAW pipe key technologies and equipment" for science and technology appraisal.

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The damaged form of LSAW steel pipe surface film

LSAW steel pipe is formed by the surface layer of very thin and strong stability of fine chromium-rich oxide film (protective film), to prevent the continued infiltration of oxygen atoms, to oxidation, and access to anti-corrosion ability. If there is some reason, this film was the constant destruction, air or liquid oxygen or metal atoms will continue to penetrate the iron atom out from the constant analysis of the formation of loose iron oxide, metal surface corrosion will be constantly . This surface film in the form of a lot of damage, more common in everyday life are summarized as follows:

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What is the difference between LSAW steel pipe and SSAW steel pipe

LSAW steel pipe and SSAW steel pipe are all welded pipe, they are widely used in the construction of national product,  LSAW steel pipe and SSAW steel pipe due to different production processes and therefore has many differences, the following details of the discussion and the spiral steel pipe joints BARS difference. Longitudinal production process is relatively simple, the main production process of high-frequency LSAW steel pipe and submerged arc straight seam steel pipe, straight seam tube high efficiency, low cost, rapid development.

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