Shell沥青气化超高压废热锅炉本体大法兰泄漏原因分析及解决措施

doi:10.3969/j.issn.1006-8805.2020.06.009

Petro-chemical Equipment Technology ›› 2020, Vol. 41 ›› Issue (6): 41-46.doi: 10.3969/j.issn.1006-8805.2020.06.009

• INSPECTION AND MAINTENANCE TECHNOLOGY • Previous Articles Next Articles

Cause Analysis and Solution of Large Flange Leakage of the Main Body in Shell Asphalt Gasification Ultra-high Pressure Waste Heat Boiler

Chen Pingping, Hu Dehao, Ma Xueqi, Qiu Lisheng

Fujian Refining and Petrochemical Co., Ltd., Quanzhou, Fujian, 362800

Received:2020-05-29 Accepted:2020-10-25 Online:2020-11-23 Published:2020-11-23

Abstract

Abstract: Since the ultra-high pressure waste heat boiler of POX unit was put into operation, leakage has occurred in the large flange of the main body many times. By analyzing the reasons for the failure of the flange welding lip seal, it was confirmed that the sealing failure was related to three factors, namely: the large assembly deviation of the lip welding gasket, defective gasket welds and insufficient bolt pre-tightening force. The main factor for the failure was insufficient bolt pre-tightening force. At the end of 2015, the welding lip seal was replaced synchronously when the coil was replaced in the waste boiler. By improving the welding lip seal assembly process and welding process, and pre-tightening the bolts regularly, the problem was solved completely. After replacing the welding lip seal, there has been no leakage accident in the large flange of the main body so far.

Key words: ultra-high pressure waste heat boiler, large flange of the main body, welding lip seal, leakage, bolt pre-tightening force

Chen Pingping, Hu Dehao, Ma Xueqi, Qiu Lisheng. Cause Analysis and Solution of Large Flange Leakage of the Main Body in Shell Asphalt Gasification Ultra-high Pressure Waste Heat Boiler[J].Petro-chemical Equipment Technology, 2020, 41(6): 41-46.

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Cause Analysis and Solution of Large Flange Leakage of the Main Body in Shell Asphalt Gasification Ultra-high Pressure Waste Heat Boiler

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