Composite steel tube used for oil and gas conveying pipeline and externally wound by glass fiber resin reinforcing protective layer

A fiberglass resin and conveying pipeline technology, which is applied in pipeline protection, pipeline protection against damage/abrasion, pipes/pipe joints/fittings, etc., to achieve the effects of improving pressure bearing capacity, saving anti-corrosion costs, and reducing manufacturing difficulty

Inactive Publication Date: 2014-12-10
CNPC BOHAI EQUIP MFG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the toughness of the existing higher grade pipeline steel material itself and the crack arrest problem of the pipeline, and to provide a pipeline with high pressure bearing capacity, strong crack arrest performance, good corrosion resistance and low manufacturing cost. Composite steel pipe for oil and gas transmission pipeline coated with glass fiber resin reinforced protective layer

Method used

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  • Composite steel tube used for oil and gas conveying pipeline and externally wound by glass fiber resin reinforcing protective layer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Such as figure 1 As shown, the composite pipe of this embodiment includes a pipeline steel base pipe 1 and a high-strength glass fiber reinforced resin layer 2. The glass fiber reinforced resin layer is a high-strength glass fiber or cloth tape impregnated with resin that is wound on the outer surface of the pipeline steel base pipe to form a new type of composite pipe for the construction of long-distance oil and gas pipelines with pipeline steel in the inner layer and FRP outer layer .

[0018] The base pipe 1 of this embodiment is a straight seam steel pipe, or a spiral steel pipe, which is welded by a submerged arc process. The outer diameter of the steel pipe is 1219mm, the wall thickness is 22mm, and the material is X80 pipeline steel. The high-strength glass fiber-reinforced resin layer 2 is composed of high-strength E glass fiber-reinforced resin, wound on the steel pipe base pipe, and the thickness of the glass fiber-reinforced resin layer after winding and curi...

Embodiment 2

[0022] The composite pipe of this embodiment is composed of a pipeline steel base pipe 1 and a fiberglass outer coating 2.

[0023] The base pipe of this embodiment is a longitudinal submerged arc welded steel pipe, the outer diameter of the steel pipe is 1422mm, the wall thickness is 21mm, and the material is X80 pipeline steel. The outer layer is composed of high-strength E glass fiber reinforced resin, wound on the steel pipe base pipe, and the thickness of the glass fiber reinforced resin composite layer after winding and curing is 5mm.

[0024] The composite pipe of this structure has the same pressure bearing capacity and reduced pipe weight compared with 100% pipeline steel pipe of the same wall thickness (outer diameter of 1422mm, wall thickness of 30.7 mm, material of X80 pipeline steel, 3PE external corrosion protection) 25%, reducing manufacturing costs by at least 20%.

[0025]

Embodiment 3

[0027] The composite pipe of this embodiment is composed of a pipeline steel base pipe 1 and a fiberglass outer coating 2.

[0028] The inner pipe of this embodiment adopts spiral submerged arc welded steel pipe, the outer diameter of the steel pipe is 508mm, the wall thickness is 9.5mm, and the material is X60 pipeline steel. The outer layer is composed of high-strength E glass fiber reinforced resin, which is wound on the steel pipe base pipe under appropriate tension. The thickness of the glass fiber reinforced resin composite layer after winding and curing is 3.2mm.

[0029] Compared with the 100% pipeline steel pipe of the same wall thickness (outer diameter of 508mm, wall thickness of 12.7mm, material of X60 pipeline steel, 3PE external anticorrosion), the composite pipe of this structure has a pressure bearing capacity increased by 38%. The weight of the pipe is reduced by 12%, and the manufacturing cost is reduced by at least 10%.

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Abstract

The invention relates to a composite steel tube used for an oil and gas conveying pipeline and externally wound by a glass fiber resin reinforcing protective layer. A traditional pipeline steel tube is taken as a base tube, high-strength glass fibers infiltrated with resin are wound around the outer surface of the pipeline steel base tube and serve as the high-strength glass fiber reinforcing resin layer, and therefore the brand new composite tube is formed, wherein the inner layer of the composite tube is pipeline steel, and the outer layer of the composite tube is glass-reinforced plastic. The composite tube has the performance characteristics of the pipeline steel tube and a glass reinforced plastic tube, the pressure bearing capacity and the crack arrest capacity of the pipeline are improved, the defect that a high-strength pipeline is poor in tenacity is overcome, 3PE outer corrosion prevention of a traditional pipeline is replaced, the corrosion-resistant and ageing-resistant capacity of the pipeline are improved, and in comparison with a 100% pipeline steel tube with the same pressure bearing capacity, the manufacturing cost of the composite steel tube is reduced by about 20%. The composite steel tube can be used and popularized in construction projects of long-distance petroleum and gas conveying pipelines.

Description

technical field [0001] The invention belongs to the technical field of composite pipe manufacture, and in particular relates to a pipe made of composite pipe steel and glass fiber reinforced plastic for the construction of oil and gas high-pressure long-distance transmission pipeline engineering. Background technique [0002] With the continuous growth of the country's demand for oil and gas energy, correspondingly higher requirements are put forward for the performance of pipelines for oil and gas transportation, such as transmission pressure, low temperature toughness, and corrosion resistance. It is difficult for the mature and applied pipeline steel to meet the above requirements. In the development of pipeline steel above X80 steel grade, the toughness of the material and the crack arrest of the pipeline are always difficult problems. It is difficult to solve the steel itself, and the development and manufacturing costs are high, which restricts the construction of long...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L9/147
CPCF16L9/147F16L57/02F16L58/1054
Inventor 付彦宏侯永高王庆强李振东张晨鹏孙灵丽刘妍
Owner CNPC BOHAI EQUIP MFG
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