Repairing process of chromium-molybdenum steel tube bundle and tube plate

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

Active Publication Date: 2014-10-29
PETROCHINA CO LTD
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  • 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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  • Repairing process of chromium-molybdenum steel tube bundle and tube plate
  • Repairing process of chromium-molybdenum steel tube bundle and tube plate
  • Repairing process of chromium-molybdenum steel tube bundle and tube plate

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Embodiment

[0080] For the E201 reforming gas heat exchanger of a methanol plant, the material of the tube sheet and the tube bundle is 13Cr1Mo44, the tube bundle and the shell are integrated, and there are tube sheets at both ends, the thickness of the tube sheet is 35mm, and the diameter is 1200mm; the diameter of the tube bundle is 32mm, and the thickness is 3.0mm, a total of 400 pieces. 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°C, and the temperature at the low temperature end is 150°C. Due to the high pressure and large temperature difference, four tube bundles leak after a long period of operation, and the tube sheet has two lengths 20mm crack, in order to ensure production, two methods are used to repair the leaking tube bundle and tube plate cracks on site.

[0081] 1. Repair of 4 leaking pipe bundles

[0082] 1. Repaired using standard chrome molybdenum steel re...

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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 field of chrome-molybdenum steel pipe plate maintenance, in particular to a chrome-molybdenum steel pipe bundle and tube plate maintenance process. Background technique [0002] Heat exchangers for cooling high-temperature special media often use chrome-molybdenum steel tube bundles and tube sheets. After long-term operation and multiple large temperature fluctuations of the heat exchanger, cracks and leakage will occur in the tube bundle, tube sheet or the interface between the tube bundle and the tube sheet. In order to ensure production and prolong the service life of the heat exchanger, it is necessary to repair and weld the leakage of the chrome-molybdenum steel pipe bundle and the tube sheet. [0003] At present, the maintenance process of chrome-molybdenum steel pipe plate is carried out according to the standard chrome-molybdenum steel welding process: firstly, the tube bundle and tube plate are preheated before we...

Claims

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Application Information

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Patent Type & Authority Applications(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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