Methodology for the quantitative assessment of the parameters of the cyclic operation of reservoirs of a large unit volume of sea terminals

UDK: 622.692.23.071
DOI: 10.24887/0028-2448-2021-10-102-107
Key words: vertical steel tank, oil terminal, cyclic operation, cycle schematization, fatigue life
Authors: N.N. Gorban (Caspian Pipeline Consortium JSC, RF, Moscow), G.G. Vasiliev (Gubkin University, RF, Moscow), I.A. Leonovich (Gubkin University, RF, Moscow), A.P. Salnikov (Gubkin University, RF, Moscow)

The article discusses the issue of the practical implementation of various methods for calculating the quantitative values of the operating cycles of the tank of the marine terminal. The analysis of the above methods is carried out for direct and indirect calculation of the cyclicality of the sea terminal reservoir. On the basis of the performed study of various methodologies for calculating fatigue damages of structures of one type or another, as reflected in the methodological documents, a comparison and critical analysis of the results of these calculations was carried out. The contradictory and ambiguous nature of the calculation results is shown on the examples of structural steel of the tank wall of the marine terminal. The regularities of the cyclic loading of the reservoirs of the sea terminals have been determined and a method has been developed for the quantitative assessment of the parameters of the cyclic operation of the reservoirs under various modes of operation of the terminals. It is shown that the actual cyclical operation of the marine terminal reservoir, taken into account on the basis of objective data from the dispatch control and management system, differs significantly from the values obtained by any analytical methods that assess the cargo flows passing through this reservoir. The paper presents a methodology for calculating the actual and permissible number of operating cycles for a defect in the geometry of the tank wall. The proposed technique is based on formalizing real irregular loading through equivalent circuits of regular cyclicity. The scheme for determining the variants of loading blocks is presented, which allows to objectively calculate for any reservoir the number of schematization classes and the number of loading blocks. On the basis of the proposed methodology and the "rainflow method" it is possible to schematize the actual values of irregular loading and present these data in the form of schematized cycles for different filling levels corresponding to the loading units.

References

1. GOST 31385-2016. Vertical cylindrical steel tanks for oil and oil-products. General specifications, URL:  https://docs.cntd.ru/document/1200138636

2. RD 153-112-017-97. Instruktsiya po diagnostike i otsenke ostatochnogo resursa vertikal'nykh stal'nykh rezervuarov (Instructions for the diagnosis and evaluation of the residual life of vertical steel tanks), Ufa: Publ. of USPTU, 1997, 74 p.

3. SA-03-008-08, Rezervuary vertikal'nye stal'nye svarnye dlya nefti i nefteproduktov. Tekhnicheskoe diagnostirovanie i analiz bezopasnosti (metodicheskie ukazaniya) (Vertical steel welded tanks for oil and oil products. Technical diagnostics and safety analysis), Ul'yanovsk: Ul'yanovskiy Dom pechati Publ., 2009, 288 p.

4. GOST 34233.6-2017. Vessels and apparatus. Norms and methods of strength calculation. Strength calculation under low-cyclic loads, URL: https://docs.cntd.ru/document/556348918.

5. API 579-1/ASME FFS-1 2016. Fitness-for-service, URL: https://www.techstreet.com/standards/api-rp-579-1-asme-ffs-1?product_id=1924300.

6. GOST R 58622-2019. Trunk pipeline transport of oil and oil products. Methods of assessing the strength, stability and durability of vertical steel tank, URL: https://docs.cntd.ru/document/1200169167

7. Gorban' N.N., Vasil'ev G.G., Leonovich I.A., Analysis of existing approaches to modeling cyclic loading of the oil tank wall of marine terminals (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2019, no. 3, pp. 110–113, DOI: 10.24887/0028-2448-2019-3-110-113

8. Gorban' N.N., Vasil'ev G.G., Leonovich I.A., Sal'nikov A.P., Study of the functioning models of tank farms of marine terminals in the Russian Federation (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2020, no. 1, pp. 77–80, DOI: 10.24887/0028-2448-2020-1-77-80

9. Gorban' N.N., Vasil'ev G.G., Leonovich I.A., The analysis of the operating mode of the large volume oil tank (In Russ.), Nauka i tehnologii truboprovodnogo transporta nefti i nefteproduktov = Science & Technologies: Oil and Oil Products Pipeline Transportation, 2019, V. 9, no. 4, pp. 394–401, DOI: 10.28999/2541-9595-2019-9-4-394-401

10. Kaspiyskiy Truboprovodnyy Konsortsium: Khronologiya proekta (Caspian Pipeline Consortium: Project timeline), URL: http://www.cpc.ru/RU/about/Pages/chronology.aspx

11. Sturges H., The choice of a class-interval, J. Amer. Statist. Assoc., 1926, V. 21, pp. 65–66.

12. GOST 25.101-83. Strength calculation and testing. Representation of random loading of machine elements and structures and statistical evaluation of results, URL: https://docs.cntd.ru/document/1200012857.

The article discusses the issue of the practical implementation of various methods for calculating the quantitative values of the operating cycles of the tank of the marine terminal. The analysis of the above methods is carried out for direct and indirect calculation of the cyclicality of the sea terminal reservoir. On the basis of the performed study of various methodologies for calculating fatigue damages of structures of one type or another, as reflected in the methodological documents, a comparison and critical analysis of the results of these calculations was carried out. The contradictory and ambiguous nature of the calculation results is shown on the examples of structural steel of the tank wall of the marine terminal. The regularities of the cyclic loading of the reservoirs of the sea terminals have been determined and a method has been developed for the quantitative assessment of the parameters of the cyclic operation of the reservoirs under various modes of operation of the terminals. It is shown that the actual cyclical operation of the marine terminal reservoir, taken into account on the basis of objective data from the dispatch control and management system, differs significantly from the values obtained by any analytical methods that assess the cargo flows passing through this reservoir. The paper presents a methodology for calculating the actual and permissible number of operating cycles for a defect in the geometry of the tank wall. The proposed technique is based on formalizing real irregular loading through equivalent circuits of regular cyclicity. The scheme for determining the variants of loading blocks is presented, which allows to objectively calculate for any reservoir the number of schematization classes and the number of loading blocks. On the basis of the proposed methodology and the "rainflow method" it is possible to schematize the actual values of irregular loading and present these data in the form of schematized cycles for different filling levels corresponding to the loading units.

References

1. GOST 31385-2016. Vertical cylindrical steel tanks for oil and oil-products. General specifications, URL:  https://docs.cntd.ru/document/1200138636

2. RD 153-112-017-97. Instruktsiya po diagnostike i otsenke ostatochnogo resursa vertikal'nykh stal'nykh rezervuarov (Instructions for the diagnosis and evaluation of the residual life of vertical steel tanks), Ufa: Publ. of USPTU, 1997, 74 p.

3. SA-03-008-08, Rezervuary vertikal'nye stal'nye svarnye dlya nefti i nefteproduktov. Tekhnicheskoe diagnostirovanie i analiz bezopasnosti (metodicheskie ukazaniya) (Vertical steel welded tanks for oil and oil products. Technical diagnostics and safety analysis), Ul'yanovsk: Ul'yanovskiy Dom pechati Publ., 2009, 288 p.

4. GOST 34233.6-2017. Vessels and apparatus. Norms and methods of strength calculation. Strength calculation under low-cyclic loads, URL: https://docs.cntd.ru/document/556348918.

5. API 579-1/ASME FFS-1 2016. Fitness-for-service, URL: https://www.techstreet.com/standards/api-rp-579-1-asme-ffs-1?product_id=1924300.

6. GOST R 58622-2019. Trunk pipeline transport of oil and oil products. Methods of assessing the strength, stability and durability of vertical steel tank, URL: https://docs.cntd.ru/document/1200169167

7. Gorban' N.N., Vasil'ev G.G., Leonovich I.A., Analysis of existing approaches to modeling cyclic loading of the oil tank wall of marine terminals (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2019, no. 3, pp. 110–113, DOI: 10.24887/0028-2448-2019-3-110-113

8. Gorban' N.N., Vasil'ev G.G., Leonovich I.A., Sal'nikov A.P., Study of the functioning models of tank farms of marine terminals in the Russian Federation (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2020, no. 1, pp. 77–80, DOI: 10.24887/0028-2448-2020-1-77-80

9. Gorban' N.N., Vasil'ev G.G., Leonovich I.A., The analysis of the operating mode of the large volume oil tank (In Russ.), Nauka i tehnologii truboprovodnogo transporta nefti i nefteproduktov = Science & Technologies: Oil and Oil Products Pipeline Transportation, 2019, V. 9, no. 4, pp. 394–401, DOI: 10.28999/2541-9595-2019-9-4-394-401

10. Kaspiyskiy Truboprovodnyy Konsortsium: Khronologiya proekta (Caspian Pipeline Consortium: Project timeline), URL: http://www.cpc.ru/RU/about/Pages/chronology.aspx

11. Sturges H., The choice of a class-interval, J. Amer. Statist. Assoc., 1926, V. 21, pp. 65–66.

12. GOST 25.101-83. Strength calculation and testing. Representation of random loading of machine elements and structures and statistical evaluation of results, URL: https://docs.cntd.ru/document/1200012857.


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