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Loose flange type flared pipe joint and method of joining steel pipes together by using the same

A joining method and a horn tube technology, applied in the field of pipe joints, can solve the problems of complicated processing procedures of the horn part, etc., and achieve the effect of significant contribution

Active Publication Date: 2012-05-09
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to form such a tapered horn, it is necessary to change the tool during the process, which complicates the process of machining the flange of the horn.

Method used

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  • Loose flange type flared pipe joint and method of joining steel pipes together by using the same
  • Loose flange type flared pipe joint and method of joining steel pipes together by using the same
  • Loose flange type flared pipe joint and method of joining steel pipes together by using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0062] Next, an experiment for evaluating the number of cycles until leakage occurs by changing the horn end face angle θ and the corner curvature radius R in various steel pipes 1 will be described as an example of the present invention.

[0063] In this experiment, first, through Image 6 In the shown method, the end portions of various SGP steel pipes 1 are bent to form the horn portion 2 . Then measure the angle θ of the end face of the horn and the radius of curvature R of the corner ( image 3 ). Two steel pipes 1a, 1b having the same horn end surface angle θ and corner curvature R are used as a set, and loose flanges 4a, 4b are brought into contact with the horns 2a, 2b. Then, the end surfaces 9, 9 of the horn parts 2a, 2b are butted against each other through the gasket 3, and connected by bolts 5 and nuts 6, thereby manufacturing a loose-fit flange-type horn pipe joint. As shown in Tables 1 and 2, the SGP steel pipes used in the test are forged welded steel pipes a...

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PUM

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Abstract

A loose flange type flared pipe joint has flared portions respectively formed at ends of two steel pipes, and also has loose flanges respectively in contact with the flared portions. The angle theta of the end surface of each flared portion relative to the center axis of the steel pipe and the curvature radius R of a corner of a connection section between the flared portion and the steel pipe satisfy the relationships of 87 <= theta <= 0.88Ln(R) + 89.3. A method of jointing steel pipes together includes a step of forming flared portions satisfying the above relationships at ends of two steel pipes, a step of butting against each other the flared portions respectively formed at the ends of the two steel pipes, and a step of mechanically fastening the two pipes together with the butted flared portions clamped by the loose flanges.

Description

technical field [0001] The present invention relates to a pipe joint that joins pipes by connecting flanges with bolts, and more specifically, relates to a pipe joint that has a flared portion provided on an end portion of a steel pipe and a loose flange that abuts against the flared portion. Mechanical connector. [0002] This application claims priority to Japanese Patent Application No. 2008-075958 filed on March 24, 2008, the content of which is incorporated herein. Background technique [0003] As a method for joining indoor piping that conveys fluids such as water, air, and steam, mechanical joints that connect flanges with bolts are used. The flange of such a mechanical joint is provided on the end of the steel pipe by welding the end of the steel pipe or by bringing the horn provided on the end of the steel pipe into contact with the loose flange. [0004] In recent years, there has been an increasing demand for loose-fit flange-type flared pipe joints that do not ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L23/024F16L23/026F16L23/028
CPCF16L23/0283
Inventor 津留英司近藤哲己佐藤哲长谷川宏
Owner NIPPON STEEL CORP