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A kind of processing method of b-type sleeve

A processing method and sleeve technology are applied in the processing field of B-type sleeves, which can solve the problems of high difficulty, high cost, and difficulty in ensuring installation quality, and achieve the effects of good mechanical properties and simple production.

Active Publication Date: 2020-05-19
BC P INC CHINA NAT PETROLEUM CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problems of complex production process, high cost, high difficulty and difficulty in ensuring the installation quality of existing B-type sleeves, and provides a processing method for B-type sleeves. The B-type sleeves are used for Emergency maintenance of oil and gas pipelines

Method used

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  • A kind of processing method of b-type sleeve
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  • A kind of processing method of b-type sleeve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] Simultaneous heat treatment and diameter expansion of straight seam submerged arc welded steel pipe

[0095] 1) Select materials that can obtain good mechanical properties through heat treatment (quick cooling (quenching) + tempering) (materials used for induction bending, steel / controlled rolling and controlled cooling steel shown in Table 1 below), production and processing sheet.

[0096] Table 1 Chemical composition (wt%) of steel / controlled rolling and controlled cooling steel products suitable for induction bending pipe production

[0097]

[0098] Among them: a) For every 0.01% reduction in carbon content than the specified maximum mass fraction, the allowable manganese content is allowed to increase by 0.05% than the specified maximum mass fraction, but for steel grades greater than or equal to B / L245 and X52 / L360, the maximum value should not exceed 1.65 %; for steel grade X60 / L415, the maximum value should not exceed 1.75%; for steel grade X70 / L485, the ma...

Embodiment 2

[0124] Diameter expansion of straight seam submerged arc welded steel pipe after heat treatment

[0125] 1) Select the same board as in Example 1.

[0126] 2) Before processing the straight seam submerged arc welded steel pipe, conduct ultrasonic flaw detection with 100% coverage on the plate to ensure that there are no delamination and other defects in the band-shaped groove and L-shaped notch on the upper surface of the plate.

[0127] 3) if figure 1 As shown, in the 1 / 2 position of the plate, grind (planing and milling) along the longitudinal direction to process a strip-shaped groove of 1.5mm (depth) × 70mm (width) × plate length, and grind (planing and milling) on ​​the two longitudinal edges of the plate Process an L-shaped notch of 1.5mm (depth) × 30mm (width) × plate length, preferably the position of the groove is about 1 / 2 of the plate and a little bit to one side (through actual processing, the position needs to be accurately determined).

[0128] 4) The plate is ...

Embodiment 3

[0141] Cold expansion of straight seam submerged arc welded steel pipe

[0142] 1) Select a steel plate material with good mechanical properties (such as the material used for the production of welded pipe, the steel / controlled rolling and controlled cooling steel shown in Table 2 below), and produce and process the plate.

[0143] Table 2 Chemical composition (wt%) of products suitable for steel pipe production (wall thickness t≤25.0mm)

[0144]

[0145]

[0146] Among them: a is based on product analysis. If the mass fraction of carbon is greater than 0.12%, the CEIIW limit applies; if the mass fraction of carbon is less than or equal to 0.12%, the CEPcm limit applies.

[0147]b For every 0.01% decrease in carbon content from the specified maximum mass fraction, the allowable manganese content is allowed to increase by 0.05% from the specified maximum mass fraction, but for steel grades greater than or equal to L245 or B less than or equal to L360 or X52, the maximum ...

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Abstract

The invention provides a machining method of a B-shaped sleeve, solves the problems that an existing B-shaped sleeve production process is complex, the cost is high, the difficulty is large, and the installation quality is difficult to guarantee. The method comprises the following steps that 1), selecting a plate; 2), forming a strip-shaped groove in the middle of the upper surface of the plate, forming L-shaped notches parallel to the groove in the two ends of the plate; 3), machining the plate into a straight seam submerged arc welding steel tube, wherein the groove and the L-shaped notchesare distributed along the axial direction of the steel tube, the groove and the L-shaped notches are located on the inner surface of the steel tube, the inner diameter of the steel tube is matched with the outer diameter of the steel tube to be repaired; 4), machining an annular groove on the inner surface of the steel tube through an expanding device; 5), cutting the steel tube machined with theannular groove to obtain semicircular sleeves, wherein annular grooves are formed in the inner surface of the semicircular sleeves, the L-shaped notch is formed in the inner surface of one straight edge of the semicircular sleeve; and 6), machining welding grooves and truncated edges on the edges of the two straight edges of the semicircular sleeves, and matching the two semicircular sleeves to form the B-shaped sleeve.

Description

technical field [0001] The invention belongs to the field of oil and gas transmission, and in particular relates to a processing method of a B-type sleeve, which is used for emergency maintenance of oil and gas transmission pipelines. Background technique [0002] The use of pipelines to transport oil and gas has the advantages of high efficiency, convenience, and environmental protection. At present, the mileage of long-distance pipelines is more than 80,000 kilometers, which brings great convenience to life. The pipeline is a special pressure vessel. During the use of the pipeline, due to its own or external factors and other factors, leakage or damage may occur, and it needs to be repaired. The repair process is completed when the medium inside the pipeline is normally transported; at the same time, the pipeline Inspections are also required during service to detect defects in the pipe, such as metal loss (thinning of the wall thickness) due to corrosion. [0003] There ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00
Inventor 李记科王高峰冼国栋杨锋平李章青聂向晖赵新伟刘迎来
Owner BC P INC CHINA NAT PETROLEUM CORP