Common root causes of recent failures of flanges in pressure vessels subjected to dynamic loads

Otegui, J.L.; Fazzini, P.G.; Márquez, A.

doi:10.1016/j.engfailanal.2008.08.027

Cited by 14 publications

(5 citation statements)

References 2 publications

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“…The analysis of the presented results shows that it is necessary to comply with the guidelines for grinding and conducting non-destructive surface tests in the case of welding the tested steel grades. Leaving arc strike on the element may pose a serious threat to the service life of the structure [23,36,37].…”

Section: Discussionmentioning

confidence: 99%

Effect of Arc Strikes on High Strength Low Alloy Steels Welded by SMAW

Fydrych,

Raczko,

Świerczyńska

et al. 2023

Adv. Sci. Technol. Res. J.

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Wet welding with covered electrodes (Shielded Metal Arc Welding -SMAW) is the most commonly used method of carrying out welding repair works in a water environment. Limited visibility and the inability to move freely under water result in an increased risk of formation of welding imperfections such as lack of fusion, lack of penetration and arc strikes. The work focused on changes in the properties and structure of steel subjected to the impact of short (0.2 s) arc ignitions generated by covered electrodes in air and under water for three high strength steel grades: S460N, S460M and S500MC. Visual tests, macroscopic and microscopic metallographic tests, microhardness measurements and diffusible hydrogen content in deposited metal determination were performed. A significant influence of the environment on changes in the morphology and microhardness of steel in the vicinity of arc strikes was found. The microhardness of the areas covered by the rapid thermal cycle caused by SMAW increased from 200-230 HV0.5 to 400-500 HV0.5 depending on the steel grade. The presence of welding imperfections: cavities and cracks were detected. The susceptibility of all steel grades subjected to short thermal cycles to cracking was confirmed by the results of measurements of the diffusible hydrogen content: 38.6 ml/100 g and 84.5 ml/100 g for air and water environment, respectively. No influence of changes in the welding current on the behavior of the material in the tested conditions was found. The conducted research shows that leaving arc strikes on the structure may have serious consequences and cause a failure.

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Section: Discussionmentioning

confidence: 99%

Effect of Arc Strikes on High Strength Low Alloy Steels Welded by SMAW

Fydrych,

Raczko,

Świerczyńska

et al. 2023

Adv. Sci. Technol. Res. J.

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“…However, oxidizing agents, usually dissolved oxygen, and relevant dynamic straining arising from thermal stratification/stripping, thermal and pressurization cycles during start-up/shut-down, etc. were always involved [1][2][3]. These cases were attributed to low-frequency corrosion fatigue, which is also designated as strain-induced corrosion cracking (SICC) in some European countries [4].…”

Section: Discussionmentioning

confidence: 99%

Failure Analysis and Redesign on Jacketed Polypropylene Reaction Kettle of Propylene

Yang

Guan

2015

AMM

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Jacketed polypropylene reaction kettle is the key equipment of polypropylene reaction setting. Cracks and leakage occurred in the kettle wall near the lower thermometer pipe branch, which is a widespread phenomenon in this refinery. The results showed that the cracks were caused by low cycle fatigue. High edge stress concentration resulted from incorrect design of the jacket structure is responsible for the fatigue cracks. An improved measurement which is available and simple was introduced.

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“…In the course of launching and flying at the high speed, the rocket or missile may be subjected to transient abnormal loads with the extremely unstable amplitude and location. For example, during the effluent process of a submarine-launched missile, a pressure pulse whose amplitude exceeds 10 MPa will be formed when a large number of bubbles on the surface of the missile collapse in millisecond after contacting with the atmosphere, which may result in the failure of the connection structure between stages [4]. Due to the complex mechanical properties [5] of the connection structure, such as the nonlinear problems of the slip between contacting interfaces [6] and geometric discontinuity [7], theoretical analysis and solutions are difficult to be established [8].…”

Section: Introductionmentioning

confidence: 99%

Study on the Failure of the Bolted Flange Connection Structure between Stages of Missiles (Rockets) under Transverse Impact Load

Tian

Yuan

et al. 2018

Shock and Vibration

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Based on the bolted flange connection structure between stages of the missiles, four experimental specimens are simplified and manufactured, and the transverse impact failure experiments of the drop hammer are designed and carried out in this study. During the experiments, a new signal sensor is designed to collect the data of the bolts force, and the response data such as the bolts force, the slotted displacement of the connecting interface, and the impact force are collected in the loading process. The sequential failure mechanism of the structure under transverse impact load is analyzed and demonstrated according to the experimental results and the measured data. Additionally, a finite element model to simulate the failure process of the connection structure has been established, and the precision of the model has been verified and validated according to the experimental results. Moreover, the comparison between the results of the experiments and the simulation shows that the precision of this model is reliable in the engineering.

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Common root causes of recent failures of flanges in pressure vessels subjected to dynamic loads

Cited by 14 publications

References 2 publications

Effect of Arc Strikes on High Strength Low Alloy Steels Welded by SMAW

Effect of Arc Strikes on High Strength Low Alloy Steels Welded by SMAW

Failure Analysis and Redesign on Jacketed Polypropylene Reaction Kettle of Propylene

Study on the Failure of the Bolted Flange Connection Structure between Stages of Missiles (Rockets) under Transverse Impact Load

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