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Loose flange-type flared pipe joint and steel pipe joining method using the same

A technology of loose flange and joining method, applied in the field of pipe joints, to achieve significant contribution

Active Publication Date: 2012-05-30
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 the flared portion having such a tapered shape, it is necessary to replace the tool during processing, and the process of flaring the flared portion becomes complicated.

Method used

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  • Loose flange-type flared pipe joint and steel pipe joining method using the same
  • Loose flange-type flared pipe joint and steel pipe joining method using the same
  • Loose flange-type flared pipe joint and steel pipe joining method using the same

Examples

Experimental program
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Effect test

Embodiment

[0059] Next, as an example of the present invention, a test for evaluating the sealability index α when the angle θ of the end surface of the flared portion is changed in various steel pipes 1 will be described.

[0060] In this experiment, first, the Figure 5 The method shown is used to flaring the ends of various SGP steel pipes 1 to form a flared portion 2 . And, the angle θ of the end surface of the flared portion was measured ( figure 2 ). Two steel pipes 1a, 1b having the same flared portion end face angle θ are used as a set, and loose flanges 4a, 4b are brought into contact with the flared portions 2a, 2b. Then, the gasket 3 is inserted to butt the end faces 9, 9 of the flared parts 2a, 2b, and the bolts 5 and nuts 6 are used to connect them, thereby manufacturing a loose-fit flange-type flared pipe joint. As shown in Table 1, the SGP steel pipes used in the test are forged steel pipes and electric seam steel pipes of sizes 65A to 200A. In addition, tensile test ...

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PUM

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Abstract

A loose flange-type flared pipe joint has flared sections respectively formed at ends of two steel pipes, and also has loose flanges respectively in contact with the flared sections. The angle theta ( DEG ) of an end surface of each flared section relative to the center axis of the steel pipes is in the range from 87 DEG to 89 DEG . A steel pipe joining method includes a step of forming the flared sections at the ends of the two steel pipes so that the angle theta is in the range from 87 DEG to 89 DEG , a step of butting against each other the flared sections formed at the ends of the two steel pipes, and a step of mechanically fastening the two pipes together with the butted flared sections clamped by the two loose flanges.

Description

technical field [0001] The present invention relates to a pipe joint for joining pipes by bolting flanges together, and more specifically, to a mechanical joint having a flared portion provided at the end of a steel pipe and a loose flange abutting on the flared portion . [0002] This application claims priority from Japanese Patent Application No. 2008-075953 filed on March 24, 2008, the contents of which are incorporated herein by reference. Background technique [0003] For the connection of indoor piping that conveys fluids such as water, air, and steam, mechanical joints that connect flanges with bolts can be used. The flange of this type of mechanical joint is installed at the end of the steel pipe by welding the end of the steel pipe or making a flared portion provided at the end of the steel pipe abut the loose flange. [0004] In recent years, there has been an increasing demand for loose-fit flange-type flared fittings that do not require welding, can be easily...

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