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A chromium-molybdenum steel pipe bundle and tube sheet maintenance process

A steel pipe bundle and process technology, applied in the field of chrome-molybdenum steel pipe plate maintenance, can solve the problems of poor welding quality and high welding cost of chrome-molybdenum steel pipe bundle and tube plate maintenance, and achieve small cold shrinkage coefficient, small heating range, and post-weld residual The effect of less stress

Active Publication Date: 2016-10-19
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of poor welding quality and high welding cost of chromium-molybdenum steel pipe bundles and tube sheets in the prior art, the embodiment of the present invention provides a chromium-molybdenum steel pipe bundle and tube sheet maintenance process

Method used

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  • A chromium-molybdenum steel pipe bundle and tube sheet maintenance process
  • A chromium-molybdenum steel pipe bundle and tube sheet maintenance process
  • A chromium-molybdenum steel pipe bundle and tube sheet maintenance process

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Embodiment

[0080] The E201 reforming gas heat exchanger of a methanol plant, the tube sheet and tube bundle are made of 13Cr1Mo44, the tube bundle and the shell are connected as a whole, there are tube sheets at both ends, the tube sheet thickness is 35mm, the diameter is 1200mm; the tube bundle diameter is 32mm, the thickness is 3.0mm, 400 pieces in total. The working pressure inside the tube bundle is 2.5Mpa, the working pressure outside the tube bundle is 9Mpa, the temperature at the high temperature end is 250℃, and the temperature at the low temperature end is 150℃. Due to the high pressure and the large temperature difference, 4 tube bundles leak after long-term operation, and the tube sheet produces two lengths. For 20mm cracks, in order to ensure production, two methods are used to repair the leaking tube bundle and tube sheet cracks on site.

[0081] 1. Repair of 4 leaking tube bundles

[0082] 1. Use standard chromium molybdenum steel repair process for repair

[0083] After heatin...

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Abstract

The invention discloses a repairing process of a chromium-molybdenum steel tube bundle and a tube plate, and belongs to the field of repairing of chromium-molybdenum steel. The process comprises a tube bundle repairing process and a tube plate repairing process. A leaking point is determined firstly, then the tube bundle and / or the tube plate are repaired according to the steps of preheating of adjacent tube openings, welding and post-welding treatment of the adjacent tube openings. The adjacent tube openings are pre-heated and subjected heat post-welding treatment through an oxygen-acetylene inner flame, a nickel base welding wire serves as welding materials, the heating and temperature control conditions on the repairing site can easily meet the requirements of the repairing process, an obtained welding joint is high in quality and not prone to new cracks, the tube openings replace crack-stopping holes in the tube plate repairing process, cracks are not prone to spread, and the welding cost and labor intensity are effectively reduced.

Description

Technical field [0001] The invention relates to the maintenance field of chromium-molybdenum steel pipe plates, in particular to a chromium-molybdenum steel pipe bundle and pipe plate maintenance process. Background technique [0002] Heat exchangers for cooling high-temperature special media often use chromium-molybdenum steel tube bundles and tube sheets. After long-term operation of the heat exchanger and multiple large temperature fluctuations, cracks will occur at the tube bundle, tube sheet, or the interface between the tube bundle and the tube sheet, and leakage will occur. In order to ensure production and extend the service life of the heat exchanger, it is necessary to repair and weld the leaks of the chromium molybdenum steel tube bundle and tube sheet. [0003] At present, the maintenance process of chromium-molybdenum steel pipe plate is carried out in accordance with the standard chromium-molybdenum steel welding process: firstly, the tube bundle and the tube sheet a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K31/02
CPCB23K31/02
Inventor 杨永磊魏军李海强李艳杨少骏冯元江张雷范福强李强高春荣胡德柏杨阳
Owner PETROCHINA CO LTD
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