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Method for welding MCS anti-sulfur carbon steel pipeline for high sulfur-containing gas field

A welding method, high sulfur technology, used in pipeline systems, welding equipment, applications, etc.

Inactive Publication Date: 2011-05-11
SINOPEC TENTH CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A high-sulfur gas field in my country (H 2 S(13%~18%), CO 2 (8%~10%)) has the highest hydrogen sulfide content in the world at present, and there is no successful construction experience at home and abroad for the welding technology of the L360MCS sulfur-resistant carbon steel pipe for the gas transportation project of the high-sulfur gas field gathering and transportation project.

Method used

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  • Method for welding MCS anti-sulfur carbon steel pipeline for high sulfur-containing gas field
  • Method for welding MCS anti-sulfur carbon steel pipeline for high sulfur-containing gas field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1. L360MCS anti-sulfur carbon steel pipe, specification Φ508×22.2mm, cutting and beveling adopt cold working, single-side beveling angle is 35°.

[0048] 2. The pair gap is 2.5mm. The pipe error is less than 1mm.

[0049] 3. Use the formal welding process for spot welding. There are 8 spot-welding spots.

[0050] 4. Before welding, use the electric heating sheet 2 of the crawler electric heater to preheat the pipes within 150mm on both sides of the groove, and the preheating temperature is 100°C. Preheat using as figure 1 The electric track heater shown.

[0051] 5. Use metal powder cored wire for semi-automatic bottom welding. During the welding process, it is necessary to strictly control the formation of the back of the weld and control the hardness value of the welded joint. Use low-hydrogen electrode arc welding for filling and cover welding. The welding process During the process, the welding line energy is strictly controlled, and the interlayer temperature ...

Embodiment 2

[0059] 1. L360MCS anti-sulfur carbon steel pipe, specification Φ508×22.2mm, cutting and beveling adopt cold working, single-side beveling angle is 30°.

[0060] 2. The pair gap is 3.0mm. The misalignment of the pipeline is less than 1mm.

[0061] 3. Use the formal welding process for spot welding. There are 10 spot welding spots.

[0062] 4. Before welding, use the electric heating sheet 2 to preheat the pipe within 180mm on both sides of the groove, and the preheating temperature is 120°C. Preheating uses crawler electric heaters.

[0063] 5. Use metal powder cored wire for semi-automatic bottom welding. During the welding process, it is necessary to strictly control the formation of the back of the weld and control the hardness value of the welded joint. Use low-hydrogen electrode arc welding for filling and cover welding. The welding process During the process, the welding line energy is strictly controlled, and the interlayer temperature of the weld seam does not excee...

Embodiment 3

[0072] 1. L360MCS anti-sulfur carbon steel pipe, specification Φ508×22.2mm, cutting and beveling adopt cold working, single-side beveling angle is 30°.

[0073] 2. The pair gap is 3.5mm. The pipe error is less than 1mm.

[0074] 3. Use the formal welding process for spot welding. There are 6 spot welding spots.

[0075] 4. Before welding, use the electric heating sheet 2 to preheat the pipe within 200mm on both sides of the weld groove, and the preheating temperature is 150°C. Preheating uses crawler electric heaters.

[0076] 5. Use metal powder cored wire for semi-automatic bottom welding. During the welding process, it is necessary to strictly control the formation of the back of the weld and control the hardness value of the welded joint. Use low-hydrogen electrode arc welding for filling and cover welding. The welding process During the process, the welding line energy is strictly controlled, and the interlayer temperature of the weld seam does not exceed 250°C during...

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Abstract

The invention discloses a method for welding an MCS anti-sulfur carbon steel pipeline for a high sulfur-containing gas field, and belongs to the technical field of pipeline welding. The welding joint of the MCS anti-sulfur carbon steel pipeline is subjected to drawing, bending, impacting, notch groove hammering, metallographic component analysis, standard liquid hydrogen induced cracking (HIC) and sulfide stress cracking (SSC) experiments, so that the welding technical problem of the L360MCS anti-sulfur carbon steel pipeline of gas conveying pipelines of a gathering and delivery project of the high sulfur-containing gas field is solved, and the method can be comprehensively applied to welding of the L360MCS anti-sulfur carbon steel pipeline of the high sulfur-containing gas field.

Description

technical field [0001] The welding method of MCS sulfur-resistant carbon steel pipes for high-sulfur gas fields belongs to the field of pipeline welding technology. Welding of L360MCS sulfur-resistant carbon steel pipelines in sour gas fields. Background technique [0002] Hydrogen sulfide H 2 Gas fields with S content exceeding 5% are high-sulfur gas fields. At present, there is no successful experience in large-scale exploitation of high-sulfur gas fields in China. For high-sulfur gas fields, how to transport high-sulfur gas is one of the main technical problems. At present, there are no corresponding construction specifications, welding standards, corresponding sulfur-resistant welding materials and welding processes at home and abroad, and there is also a lack of successful construction experience that can be used for reference. A high-sulfur gas field in my country (H 2 S(13%~18%), CO 2 (8%~10%)) has the highest hydrogen sulfide content in the world at present. For ...

Claims

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Application Information

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IPC IPC(8): B23K31/02B23K101/10
Inventor 魏家斌吴忠宪陈茂斌唐元生左静
Owner SINOPEC TENTH CONSTR
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