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Method of joining components, fitting and tube joint where at least one of the components comprises or is made of material difficult to weld

A technology for pipe joints and components, applied in the direction of pipes/pipe joints/fittings, welding equipment, threaded connections, etc., can solve the problems of shortened life, increased labor costs and material costs, weak structural mechanical properties, etc., and achieve the effect of load reduction

Inactive Publication Date: 2007-12-05
SANDVIK INTELLECTUAL PROPERTY AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of using such pipes is that the mechanical stability of the joined pipe parts is reduced due to the removal of material from the pipe when the thread is cut out of the pipe
Weaker mechanical properties of the structure means reduced life of the joined pipe sections and thus increased labor and material costs

Method used

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  • Method of joining components, fitting and tube joint where at least one of the components comprises or is made of material difficult to weld
  • Method of joining components, fitting and tube joint where at least one of the components comprises or is made of material difficult to weld
  • Method of joining components, fitting and tube joint where at least one of the components comprises or is made of material difficult to weld

Examples

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Embodiment Construction

[0037] FIG. 1 a shows two partially threaded pipes 2 , 3 joined together by a partially threaded external pipe connection 1 made of metallic or ceramic material. These tubes 2 , 3 may be heating tubes or high-temperature process tubes used, for example, in oil refineries, chemical or petrochemical plants, power plants, steelworks or nuclear power installations.

[0038] Although in this example the tubes 2, 3 have the same diameter, the joining method of the invention can be used to join tubes having different diameters. In addition, pipe fittings with multiple branch pipes, such as Y-shaped pipe fittings, can also be used to join multiple pipes.

[0039] The pipe joint 1 is not fully threaded on its entire inner surface 1'. It is threaded only on a portion T of its inner surface 1'. Both pipes 2, 3 have corresponding threads on their outer surfaces, thereby providing the possibility to screw the pipes 2, 3 together with the pipe joint 1 to form a joint structure whereby sai...

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PUM

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Abstract

Method of joining at least two components (2, 3) utilising a fitting (1), where at least one of the components comprises, or is made of, a material which is difficult to weld. The components (2, 3) are provided with thicker walls at the end surfaces (6) that are to be joined. At least one of the thicker end walls is provided with an internal or external thread (T) and said at least two components are joined together by screwing said threaded end walls into and / or onto the fitting (1).

Description

technical field [0001] The present invention relates to a method of joining at least two components, such as pipes, with a joint, wherein at least one of the components comprises or is made of a material that is difficult to weld. Background technique [0002] Interruptions to the operation of large chemical plants can result in significantly lower throughput and lost revenue for every hour that the plant is down. Several routine maintenance operations require major parts of the equipment to be taken out of service until all work is completed. One such operation is the replacement of cracking furnace tubes used to make ethylene. [0003] Tubes for furnaces such as steam cracking units typically operate in the temperature range of 900-1200°C, they can be about 20m long, are therefore very heavy, and they usually convey corrosive or carbonaceous media. To withstand these high operating temperatures, high loads and corrosive or carburizing environments, a large number of stai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L15/00F16L49/02F16L21/08B23K9/04F16LF16L15/08F16L21/00
CPCF16L15/08F16L21/08F16L21/002B23K9/046F16L15/00F16L49/02
Inventor C·奥恩格伦R·贝里隆德J·约瑟夫松M·伦德贝里
Owner SANDVIK INTELLECTUAL PROPERTY AB