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Double-seam submerged-arc welding pipe with petroleum and natural-gas transfer and its production

A technology of submerged arc welded pipe and production method, applied in the direction of pipe, rigid pipe, pipe/pipe joint/pipe fitting, etc., can solve the problem of insufficient capacity of steel plate for pipe making, and achieve good appearance and internal quality of weld seam, and good position of weld seam , the effect of high dimensional accuracy

Active Publication Date: 2009-01-14
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The invention provides a production method of double seam submerged arc welded pipes for oil and natural gas transportation, which changes the process of straight seam submerged arc welded pipes to produce high-quality steel pipes with an outer diameter of more than 1016 mm and a wall thickness of more than 21 mm; Half of the pipe-making plates are used to manufacture large-diameter steel pipes to overcome the problem of insufficient capacity of domestic wide-thick pipe-making steel plates

Method used

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  • Double-seam submerged-arc welding pipe with petroleum and natural-gas transfer and its production

Examples

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Embodiment 1

[0029] Embodiment 1: refer to accompanying drawing. Taking the production method of a double seam submerged arc welded steel pipe for oil and natural gas transportation with an outer diameter of 1016mm and a wall thickness of 29mm as an example, further explanation is given.

[0030] The production process of spliced ​​plate double seam submerged arc welded pipe, the main process is as follows:

[0031] A. Use two steel plates with a width of 1596mm, a length of 12000mm, and a thickness of 29mm. Each steel plate is processed with welding grooves along the two edges of the length direction, and the two steel plates are welded along one end of the length direction by double-sided submerged arc welding. Splicing together, the width of the spliced ​​steel plates reaches the width requirement for manufacturing steel pipe 1 with an outer diameter of 1050 mm, ie 3192 mm.

[0032] B. UOE straight seam submerged arc welding steel pipe production process is used to manufacture steel pi...

Embodiment 2

[0035] Embodiment 2: refer to accompanying drawing. Taking the production method of a double seam submerged arc welded steel pipe for oil and natural gas transportation with an outer diameter of 1219mm and a wall thickness of 32mm as an example, further explanation is given.

[0036] Formed double seam submerged arc welded pipe production process (called COE double seam submerged arc welded pipe production process), the main process is as follows:

[0037] A. Two steel plates with a width of 1915mm, a length of 12000mm, and a thickness of 32mm are used to process welding grooves on their longitudinal edges, and each steel plate is pressed into a "C" shape with a press and a forming die to make two " C" shaped half pipe.

[0038] B. Two C-shaped semi-pipes are positioned and welded along the longitudinal welding groove group on the mold to form an "O"-shaped round pipe, and then two welds 2 are formally welded. The welding method is double-sided submerged arc welding.

[0039...

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Abstract

Oil and natural gas are delivered by the double-slit sew pipe and method of production. Characteristic is: Adopt two pieces of steel plate whose width as steel pipe the girth 1 / 2 , make use of two-sided arc weld to put together two pieces of steel plate following lengthways, then take common used method to product steel pipe . Another method is to make two pieces of steel plates carry on C's model respectively. The two C-shaped are weld to a group of O-pipe, after expanding, nondestructive testing, the product is completed. Effect: Reduce the steel pipe's manufacturing difficulty; make use of existing LSAW pipe equipment, use of existing LSAW pipe equipment, produce outside path at 1016 mms above, wall thickness at 21 mm above the high-quality steel pipe.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and relates to a large-diameter pipeline used for oil and natural gas transportation and a production method, in particular to a double-seam submerged arc welded pipe and a production method thereof. Background technique [0002] How much diameter and thickness of steel pipe should be used for China-Russia, Central Asia and other natural gas pipelines with an annual output of more than 30 billion cubic meters has become a hot topic among pipeline experts. A difficult problem restricting the construction of natural gas pipelines is the production of large-diameter, thick-walled steel pipes. my country's ability to produce wide and thick steel pipes and large-diameter thick-walled steel pipes is insufficient, and steel pipes with larger outer diameters and larger wall thicknesses cannot be produced. [0003] my country has built a number of large outer diameter longitudinal submerged arc w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L9/02F16L9/17
Inventor 李为卫冯耀荣霍春勇吉玲康易晓明赵新伟
Owner BC P INC CHINA NAT PETROLEUM CORP
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