Risk Based Approach to Integrity Assessment of a Large Spherical Pressure Vessel

Sedmak, Aleksandar; Kirin, Snežana; Golubović, Tamara; Mitrović, Slobodan; Stanojević, Petar

doi:10.1016/j.prostr.2016.06.454

Cited by 6 publications

(6 citation statements)

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“…Regarding probability, as already explained, it is separated into two major affecting factors, material defects and human factor. In the case of crack-like defects there is already new, interesting concept, based on fracture mechanics approach, applied recently for large spherical storage tank [6] and cylindrical pressure vessel [8], using the FAD to assess structural integrity of a cracked component. The basic concept of FAD is to evaluate ratios between the stress intensity factor and fracture toughness (Y coordinate), which can be interpreted as the probability of brittle fracture, and between the local stress and its critical value (X coordinate), which can be interpreted as the probability of plastic collapse, Fig.…”

Section: Risk Based Approach -New Methodologymentioning

confidence: 99%

“…1, using the simple definition of risk (product of probability and consequence). Even in that case, there are different options, some of them recently introduced [3][4][5][6][7][8], which turned out to be efficient and useful engineering tool, especially for managers when they have to make difficult decisions. Anyhow, simple methods do not provide precise solutions generally speaking.…”

Section: Introductionmentioning

confidence: 99%

“…2, has been used here as simple engineering tool to estimate probability of the failure due to material defects, taken as the function of the position of the operating point. Namely, probability of failure due to crack-like defect has been recently defined as the ratio between the distance of the operating point from the zero point, and the appropriate distance between the point on the limiting curve and zero point, [4][5][6]. This can be used regardless of defect existence, since one can also assume crack existence, just for the sake of a conservative approach, in the same way as it is sometimes done in a design phase.…”

Section: Introductionmentioning

confidence: 99%

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Novel Risk Based Assessment of Pressure Vessels Integrity

2018

Teh. vjesn.

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New methodology for risk based approach to integrity assessment of pressure vessels has been introduced. Namely, the risk matrix has been defined with consequence taken as usual, whereas probability has been separated into two, emphasizing effects of human factor and material defects. Toward this end, the failure assessment diagram (FAD) has been used here as a simple engineering tool to estimate probability of the failure due to material defects. Probability of failure due to human factor has been estimated according to the survey performed (with operators and managers) in the firm where pressure vessel is located and operated. With consequence estimated according to the simple standard procedure or by using more complex procedures (API 581, RIMAP), the novel risk based structural assessment has been completed. As an example, cylindrical storage tanks for compressed air are analysed.

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Section: Risk Based Approach -New Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Novel Risk Based Assessment of Pressure Vessels Integrity

2018

Teh. vjesn.

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“…Generally speaking, large spherical tanks (Fig. 4), 150 to 5000 m 3 [12] Several spherical tanks are also in service in the company HIP-AZOTARA (Pančevo, Serbia). In regular in-service inspection, many defects, mostly cracks, had been detected in welded joints from the inner side of the sphere.…”

Section: Case Study -Welded Joints In a Large Spherical Storage Tank mentioning

confidence: 99%

“…1) with one axis representing probability and the other one, representing consequence. This approach has been analysed in number of recent publications [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Welded joints as critical regions in pressure vessels -case study of vinyl-chloride monomer storage tank

Golubović

Sedmak

Spasojević-Brkić

et al. 2018

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Welded joints are analysed as critical regions in a pressure vessel in respect to structural failure due to the elastic-plastic fracture/crack growth. To assess structural integrity of pressure vessels used in chemical industry the risk based procedure has been introduced and applied in the case of a large spherical pressure vessel used as a vinyl-chloride monomer (VCM) storage tank in HIP Azotara Pancevo. The risk matrix has been used, taking into account the basic definition of risk, being the product of the probability and consequence, and applied to different regions of welded joints, having different mechanical properties, i.e. crack resistance. To estimate probability, the failure assessment diagram (FAD) has been used, as an engineering tool, defined according to the position of the operating point for different regions of the welded joint, relative to the critical point on the limit curve. Generally speaking, consequence is estimated based on pressure vessel parameters, or by detailed analysis of health, safety, business and security issues, but in the analysed case, the worst case scenario is assumed, with the highest consequence due to potential disaster for environment and fatalities. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. TR 33044 and Grant no. 35017]

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