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Sulfur condenser tube plate analysis and treatment of crack

Welding by plugging the new process, and before and after welding to weld heat treatment, the number of days of its running time than the B increased by 100 days. This proves that we adopt some method is effective. 88 Guangdong Chemical Ⅵ vW. gdchem. com2007 No. 5 Volume 34 No. 169 overall construction program in Table 3 Tab. 3Workproject workshop I plugging construction plan sets a sulfur condenser, Profile: (omitted) Second, the construction process: a hydrostatic test shell condenser tubes and tube sheet of a fillet weld surface rust to impurities in hydrogen and handling consumer corner 100% PT weld surface defect repair welding of a -, ~ b weld color inspection of a shell pressure and hydrostatic test. Third,[link widoczny dla zalogowanych], the construction of technical requirements: 1, the first sulfur condenser pressure test, the test pressure is 0.6MPa (design test pressure). Comprehensive inspection of sulfur condenser tubes and tube sheet and tubes if there is leakage of the weld, if the requirements for plugging leaks. 2, the tube sheet surface accumulation of a large amount of sulfur,[link widoczny dla zalogowanych], rust and other impurities, requires removal of rust wheel machine tube sheet surface impurities. 3, condenser tube side of the working media for the process gas containing H2S and other impurities, the tube plate to eliminate impurities in hydrogen and to treatment, treatment process as shown below, treatment with electric heating method. (The maintenance of the use of electric heating tool as a hanging piece, cotton insulation for the slow cooling) 3 【1 (1 ~ 350 ℃ 50 ~ C / h heating insulation slow cooling 50 ~ C / h cooling 4, after elimination of hydrogen, C. weld surface 100% PT, confirm the exact location of weld defects. 5, weld defects deal first with the grinding wheel machine, and then using J422 repair welding electrode, welding rod specification (p2.5mm, process parameters are as follows current / A voltage, V welding speed / (cmmin.) 40 ~ 60204228 ~ 10 required preheat 100 ~ C or more, after welding, heat treatment before welding heat by slow cooling. 6, seam welding is completed, 100% PT colored checks, according to JB730- 94 Standard I level in compliance. 7, due to leakage not only in the weld, there may also have leaks tubes and,[link widoczny dla zalogowanych], if so,[link widoczny dla zalogowanych], then add two plug welded tubes. 8, disposed of all the leak, then the water pressure and leak test, the test pressure is 0.6MPa,[link widoczny dla zalogowanych], a comprehensive inspection leak is qualified. Head: (abbreviated) the preparation of: (a little) sign: (omitted) 4.4 Conclusion summarizes the experience of several maintenance and construction programs have Some, such as to make appropriate improvements, the effect will be better. (1) constant temperature heat treatment of hydrogen consumption increased to 400 ~ 450 ~ C, so that elimination of hydrogen would be better. (2) try to reduce and control the welding current minimum, to improve welding speed, so that further reduce the heat affected zone, this can largely improve the performance of welded joints. (3) using J427 electrode, welding procedures according to JB-T4709-92. (4) preheat temperature increased to 2o0 ~ 300 ~ C, the gap can weld metal and reduce the temperature around the metal, welding and then to evenly shrink while slow cooling can significantly reduce the residual stresses. (5) post-weld heat treatment temperature increased to 400 500 ~ C, slow cooling and insulation, which can basically eliminate 80 to 90% of the welding residual stress. (6) designed with H2S-H2O system with anti-stress corrosion cracking, and has the capacity and resistance to high temperature sulfidation corrosion resistance to dilute acid ability to make seamless tubes 08Cr2A1Mo. The steel market in 2000 after allegedly better.
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