LSAW pipe pre-welding technology

In the pipeline construction, oil and gas long-distance pipeline is toward large-diameter high-pressure transmission and the direction of the development of thick submarine pipeline, a growing number of pipeline requests using LSAW steel pipe. As China's few through-submerged arc welded pipe production line put into the introduction, to grasp the advanced welding technology LSAW is especially key.

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The application range of LSAW

LSAW steel pipe diameter in the range between 406 ~ 1600mm, in exceptional cases even more, the ratio of wall thickness and diameter of about 0.06 to 0.08. Modern foreign technology can produce pipe up to 100mm wall thickness of pipe.

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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 technical advantages of LSAW

LSAW (LSAW-Longitudinal Submerged Arc Welded) was invented in 1940, a new welding method, welding hand in front of it and the same place it is to protect the use of slag, but this residue is not a skin electrode medicine . Straight seam double submerged arc welding and manual welding the same place it is to protect the use of slag, but this residue is not a skin electrode medicine, is dedicated melting out of the welding flux. The welding system consists of a funnel drug loading of the welding flux through a pipeline to be welded to the front.
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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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How to identify the quality and the test method of seamless steel tubes

Seamless rib is the main concrete structure, pipe diameter, 1.0m, 16mm thick from the A3 segment rolled steel plate welded in the factory shape. Seamless micro-expansion of concrete is C50 concrete. Seamless steel pipe in order to understand the density of concrete pumping and concrete and steel wall of the bond quality, the use of ultrasonic pulse method for the construction of the main arch steel construction quality of concrete non-destructive detection and identification.

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Gerneral welded seamless steel pipe for transporting low-pressure fluid

General welding seamless pipe used to transport low-pressure fluid. With Q195A, Q215A, Q235A steel. Also can be easily welded to other soft steel. Seamless to the pressure, bending, flattening, or other experimental conditions, the manufacturer according to their own more advanced testing, welding seamless pipe usually has a certain surface quality requirements, delivery is usually the length of 4-10m, according to the the actual requirements of the manufacturer shall be required to cut to length or double length delivery. Specifications with the nominal pipe diameter that different from the actual nominal diameter, pipe wall thickness required to have thin-walled and thick-walled seamless tube seamless two, seamless form divided by the pipe end with a threaded and non threaded two.

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The insuffient of spiral steel pipe for boiler in the quality

The insuffient of spiral steel pipe for boiler in the quality

(1) spiral boiler tube manufacturing process to determine their residual stress is large, according to foreign information records, and some even close to the yield limit, LSAW pipe boiler tube expansion process due to the use of residual stress close to zero.

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The application of spiral steel pipe in the urban central heating

Urban central heating is generated by the concentrated heat of steam, hot water supply pipe network through a city or parts of the heating used in the production and living way, which consists of heat, heat networks, heat users of three parts.

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