Helical submerged arc welded pipe for high pressure / high proportion hydrogen delivery

Abstract

The utility model discloses a spiral submerged arc welding pipe for conveying high pressure / high proportion hydrogen, which comprises a welding pipe, an outer coating is arranged on the outer wall of the welding pipe, the outer coating sequentially comprises an inner belt layer, a bonding layer and an outer belt layer from inside to outside, the welding pipe comprises a pipe blank, and a spiral welding seam is welded on the pipe blank. The spiral submerged arc welding pipe solves the problems that an existing pipeline for conveying high-pressure / high-proportion hydrogen is low in conveying efficiency and poor in safety.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydrogen transportation pipelines, and in particular relates to a spiral submerged arc welded pipe used for high-pressure / high-proportion hydrogen transportation. Background Art

[0002] Hydrogen has the characteristics of high energy density, pollution-free, and renewable, and is regarded as a clean and efficient alternative secondary energy source. Safe and efficient hydrogen transportation technology is one of the main bottlenecks for the large-scale application of hydrogen energy. At this stage, pipeline hydrogen transportation is the most ideal way to transport hydrogen. However, during the hydrogen transportation process, pipelines often suffer from ductility and plasticity loss, increased fatigue crack growth rate, and hydrogen-induced delayed fracture, causing pipeline failure, resulting in low transportation efficiency and poor safety. This largely restricts the development of my country's hydrogen energy industry, and the demand for welded pipes for high-pressure / high-proportion hydrogen transportation is more urgent. Therefore, the development of a spiral submerged arc welded pipe for high-pressure / high-proportion hydrogen transportation has broad market prospects. Utility Model Content

[0003] The utility model aims to provide a spiral submerged arc welded pipe for high-pressure / high-proportion hydrogen transportation, so as to solve the problems of low transportation efficiency and poor safety of existing pipelines for transporting high-pressure / high-proportion hydrogen.

[0004] The technical solution adopted by the utility model is a spiral submerged arc welded pipe for high-pressure / high-ratio hydrogen transportation, comprising a welded pipe, an outer coating is arranged on the outer wall of the welded pipe;

[0005] The outer coating layer includes an inner tape layer, a bonding layer, and an outer tape layer from the inside to the outside;

[0006] The welded pipe comprises a pipe blank on which a spiral weld is welded.

[0007] The utility model is also characterized in that:

[0008] The thickness of the inner belt layer is 80 μm to 120 μm, the thickness of the adhesive layer is 150 μm to 280 μm, and the thickness of the outer belt layer is 3.0 mm to 4.0 mm.

[0009] The tube blank is provided with a Y-shaped welding groove with a groove angle of 90° and a blunt edge of 4 mm to 6 mm.

[0010] The weld excess height is 1.3mm~1.8mm.

[0011] The cross section of the weld is arc-shaped and the arc angle is 96° to 106°.

[0012] The beneficial effects of the utility model are as follows: (1) The spiral submerged arc welded pipe used for high-pressure / high-proportion hydrogen transportation of the utility model has excellent hydrogen embrittlement resistance, good fracture toughness and low-temperature impact toughness, etc., which can avoid the problems of ductility and plasticity loss, fatigue crack growth rate aggravation and hydrogen-induced delayed fracture caused by the welded pipe when transporting high-pressure / high-proportion hydrogen, thereby ensuring safe and efficient transportation of hydrogen;

[0013] (2) The spiral submerged arc welded pipe used for high-pressure / high-ratio hydrogen transportation of the utility model is provided with an outer coating, and the outermost layer of the outer coating is a steel belt reinforced polyethylene layer, which can greatly improve the overall strength of the welded pipe and extend its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of a spiral submerged arc welded pipe for high-pressure / high-ratio hydrogen transportation according to the utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the outer coating of the spiral submerged arc welded pipe used for high-pressure / high-ratio hydrogen transportation according to the utility model;

[0016] Figure 3 It is a schematic structural diagram of a welded pipe in a spiral submerged arc welded pipe for high pressure / high ratio hydrogen transportation according to the utility model;

[0017] Figure 4 The utility model is a schematic structural diagram of the welding groove and blunt edge in the spiral submerged arc welded pipe used for high pressure / high ratio hydrogen transportation.

[0018] In the figure, 1. outer coating, 2. welded pipe, 3. inner belt layer, 4. bonding layer, 5. outer belt layer, 6. weld, 7. welding groove, 8. blunt edge, 9. pipe blank. DETAILED DESCRIPTION

[0019] The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.

[0020] Example 1

[0021] The utility model is used for high pressure / high ratio hydrogen transportation spiral submerged arc welded pipe, the structure is as follows Figure 1 As shown, it includes a welded pipe 2, an outer coating 1 is provided on the outer wall of the welded pipe 2, and the outer coating has anti-corrosion and reinforcing effects. The inner and outer surfaces of the welded pipe 2 are shot peened to improve the bonding force of the outer coating 1 and improve the uniformity of the surface performance of the welded pipe 2;

[0022] like Figure 2 As shown, the outer coating 1 includes an inner tape layer 3, a bonding layer 4, and an outer tape layer 5 from the inside to the outside, the inner tape layer 3 is an epoxy powder coating, the bonding layer 4 is an adhesive layer, and the outer tape layer 5 is a steel tape reinforced polyethylene layer;

[0023] like Figure 3 As shown, the welded pipe 2 includes a tube blank 9, on which a spiral weld 6 is welded. The spiral weld 6 is realized based on the provision of a spiral seam on the welded pipe 2, which extends spirally along the tube blank 9. The weld formed by welding the spiral seam is the spiral weld 6. When an explosion occurs in a hydrogen pipeline, the spiral weld 6 has a good effect of blocking cracks, and is easier to stop cracks than a straight seam pipe.

[0024] Example 2

[0025] The utility model discloses a spiral submerged arc welded pipe for high pressure / high ratio hydrogen transportation, comprising a welded pipe 2, on the outer wall of which an outer coating 1 is arranged;

[0026] The outer coating 1 includes an inner tape layer 3, a bonding layer 4, and an outer tape layer 5 from the inside to the outside. The inner tape layer 3 is an epoxy powder coating with a thickness of 80 μm to 120 μm; the bonding layer 4 is an adhesive layer with a thickness of 150 μm to 280 μm; the outer tape layer 5 is a steel tape reinforced polyethylene layer with a thickness of 3.0 mm to 4.0 mm;

[0027] The welded pipe 2 comprises a pipe blank 9 on which a spiral weld 6 is welded.

[0028] Example 3

[0029] The utility model is a spiral submerged arc welded pipe for high-pressure / high-proportion hydrogen transportation, comprising a welded pipe 2, an outer coating 1 is arranged on the outer wall of the welded pipe 2, and the outer coating 1 comprises an inner belt layer 3, a bonding layer 4, and an outer belt layer 5 from the inside to the outside, the inner belt layer 3 is an epoxy powder coating with a thickness of 80μm to 120μm; the bonding layer 4 is an adhesive layer with a thickness of 150μm to 280μm; the outer belt layer 5 is a steel belt reinforced polyethylene layer with a thickness of 3.0mm to 4.0mm;

[0030] The welded pipe 2 includes a tube blank 9, on which a spiral weld 6 is welded, the outer diameter of the welded pipe is 400 mm to 500 mm, the wall thickness is 8 to 11 mm, and the tube blank 9 is made of low C, low Mn, low alloy hydrogen-resistant steel, such as Figure 4 As shown, a Y-type welding groove 7 is provided on the tube blank 9, the groove angle is 90°, and the blunt edge 8 is 4mm~6mm. The Y-type groove welding technology has higher economic benefits and a larger blunt edge size. Compared with other groove forms, it can reduce the weld filling metal. Through the setting of the groove and the blunt edge, the weld of the welded pipe has excellent toughness and strong resistance to hydrogen embrittlement. The excess height of the weld 6 is 1.3mm~1.8mm, and the weld 6 and the tube blank 9 have a smooth transition. The cross-section of the weld 6 is arc-shaped and the arc angle is 96°~106°. The filler metal of the weld 6 is a high-toughness hydrogen-resistant metal. The welding wire used for welding is a low-hydrogen and high-toughness welding wire with a diameter of 3mm~4mm. The flux uses a low-hydrogen aluminum alkali type sintered flux with a flux particle size of 50 mesh~70 mesh. The welding method uses submerged arc welding.

[0031] The manufacturing process of the spiral submerged arc welded pipe for high-pressure / high-proportion hydrogen transportation of the utility model is as follows: after pre-welding the tube blank 9, low-hydrogen high-toughness welding wire and low-hydrogen aluminum alkaline sintered flux are used for submerged arc fine welding, which greatly reduces the residual hydrogen in the weld, and the molten pool electromagnetic stirring technology is used to control the weld crystallization process during the welding process, thereby improving the hydrogen embrittlement resistance of the weld. After that, the tube end of the welded tube blank 9 is expanded in a round shape, X-ray inspection is performed, and the welded pipe 2 that passes the inspection is subjected to a water pressure test and ultrasonic flaw detection to reduce the residual stress of the pipe material, thereby improving the hydrogen embrittlement resistance of the welded pipe. The inner and outer surfaces of the welded pipe 2 are shot peened, and finally, an outer coating 1 is coated on the outer surface of the welded pipe 2. The outer coating 1 is coated in a sequence from the inside to the outside. After testing, the hydrogen-induced crack sensitivity rate (CSR), crack length rate (CLR), and crack thickness rate (CTR) of the weld are all 0.

Claims

1. Spiral submerged arc welded pipe for high pressure / high ratio hydrogen transportation, characterized in that: It comprises a welded pipe (2), wherein an outer coating (1) is provided on the outer wall of the welded pipe (2); The outer coating (1) comprises, from the inside to the outside, an inner tape layer (3), a bonding layer (4), and an outer tape layer (5); The welded pipe (2) comprises a tube blank (9), on which a spiral weld (6) is welded.

2. The spiral submerged arc welded pipe for high pressure / high ratio hydrogen transportation according to claim 1, characterized in that: The thickness of the inner belt layer (3) is 80 μm to 120 μm, the thickness of the adhesive layer (4) is 150 μm to 280 μm, and the thickness of the outer belt layer (5) is 3.0 mm to 4.0 mm.

3. The spiral submerged arc welded pipe for high pressure / high ratio hydrogen transportation according to claim 1, characterized in that: The tube blank (9) is provided with a Y-shaped welding groove (7), the groove angle is 90 degrees, and the blunt edge (8) is 4mm to 6mm.

4. The spiral submerged arc welded pipe for high pressure / high ratio hydrogen transportation according to claim 1, characterized in that: The excess height of the weld (6) is 1.3 mm to 1.8 mm.

5. The spiral submerged arc welded pipe for high pressure / high ratio hydrogen transportation according to claim 1, characterized in that: The cross section of the weld (6) is arc-shaped and has an arc angle of 96° to 106°.

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