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Bimetal clad steel pipe welding method

A composite steel pipe, bimetal technology, applied in welding equipment, metal processing equipment, arc welding equipment and other directions, can solve the problems of short service life, easy to be damaged, high maintenance cost, reduce safety hazards, not easy to pipeline leakage, welding Reliable quality results

Active Publication Date: 2015-12-16
中国化学工程第四建设有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although the prices of plastic alloy pipes and glass steel pipes are low (the unit price of plastic alloy pipes is only 90% of that of bimetallic composite pipes, and the price of glass steel pipes is even lower, only about 82%), the one-time construction investment cost is less, but in the process of operation It is greatly affected by environmental factors, especially in the long-distance sewage transportation, due to the unavoidable impact of human factors, high temperature and cold climate, and geological disasters (such as landslides, debris flows, etc.) under complex geological terrain conditions, Easy to be damaged, short service life, generally about ten years, high maintenance cost

Method used

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  • Bimetal clad steel pipe welding method
  • Bimetal clad steel pipe welding method
  • Bimetal clad steel pipe welding method

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Embodiment Construction

[0025] 1. Equipment and material acceptance: All pipes, fittings, valves, welding consumables, etc. must have certificates of conformity and material quality certificates before leaving the factory. The appearance inspection of the pipeline shall not have defects such as cracks, folds, shrinkage cavities, slag inclusions, corrosion that does not exceed the negative tolerance of wall thickness, pitting, pollution of different materials, and mechanical damage.

[0026] 2. Pipeline anticorrosion treatment: Sandblasting and derusting methods are used for pipeline surface treatment. Anticorrosion materials should be evenly prepared, matured, and painted in time according to the ratio specified by the material. After each coating is applied, dry film testing and Coating inspection.

[0027] 3. Pipe groove processing: The groove form of the pipe welded joint should adopt V-shaped groove. Plasma cutting or cold cutting can be used to cut bimetallic composite steel pipes. Composite st...

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Abstract

The invention belongs to a construction technology welding method for building engineering. In particular, it refers to the welding installation of bimetal composite steel pipes (SFG) in stations or long-distance pipeline projects, which includes the following steps: pipe groove processing, base pipe and liner gap girth welding, stainless steel liner butt weld welding, Dissimilar steel butt joint welding, intermediate layer weld seam filling welding, surface layer weld seam cover welding, bimetallic composite steel pipe solves the problem of oil field sewage transportation well, has strong applicability and high technological advancement, While fully meeting the requirements of oilfield sewage transportation, it can effectively reduce the user's operating costs, minimize safety hazards, and has a very broad application prospect.

Description

technical field [0001] The invention belongs to a construction technology welding method for building engineering. In particular, it refers to the welding installation of bimetal composite steel pipes (SFG) in stations or long-distance pipeline projects. Background technique [0002] In the oil field production capacity construction project, a large amount of oily sewage will be produced, which needs to be collected and treated in time to reduce environmental pollution; The sewage generated during the production process of the gathering and transportation system is reinjected into the production oil well through the high-pressure pipeline. [0003] This part of sewage is mainly composed of two parts, one is Jurassic sewage and the other is Triassic sewage, which is extremely corrosive. From the perspective of corrosion mechanism, there are both chemical corrosion and biological corrosion, often These two kinds of corrosion are acting at the same time, and the corrosion res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/23B23K9/16B23K9/235
Inventor 孙韵罗长彪周栗
Owner 中国化学工程第四建设有限公司
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