PSI - Issue 22

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Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 ScienceDirect

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Procedia Structural Integrity 22 (2019) 291–298

© 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the First International Symposium on Risk and Safety of Complex Structures and Components organizers © 2019 The Authors. Published by Elsevier B.V.This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the First International Symposium on Risk and Safety of Complex Structures and Components organizers A group f s ecialist was assign d the task to conduct a site inspect o and rovide a statement for the operational conditi n of 7 ew a d 13 steel storage tanks in service, ow ned by State age cy “State reserve and war - time stocks”. The facilities contain different oil products – petrol, diesel and mix d fuel stored t ambient temperature and atmospheric pressure. The anchorage conditi s vary. Some of th examine storage anks were built in the 1970s, others – in the period 2009 - 2014. The audit was carried out in accordanc wi h the Agency’s inter al di ective and standard API 650, API 653, EN 1993-4-2, EN 14015. Based n th s representative study and th practic l e ign experience of the authors, this paper cl ssifies the most frequently repo ted damage in diff rent lements of tanks in operation – foundations, nchorage (if present), annular plates, tank bottom, shell, roof (fixed or floating), attached accessories and sys ems. Illustrat ve examples are pr sented, along with explanations for the critical aspects of adequate maintenance. Finally, some conclusions are drawn in the form of guidelines for failure prevention and if the damage already exists - pos ibl ways for restoration of th facil ty to its proper operational state. © 2019 The Authors. Publ shed by Elsev er B.V.This is an open access article u er the CC BY-NC-ND li ense (http://cr a ivecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the First International Symposium on Risk and Safety of Complex Structures and Components organiz rs First International Symposium on Risk and Safety of Complex Structures and Components Typical damage in steel storage tanks in operation Lyubomir Zdravkov a, *, Mariya Pantusheva a a Department of Steel, Timber and Plastic Structures, Faculty of Civil Engineering, University of Architecture, Civil Engineering and Geodesy, 1 Hristo Smirnenski Blvd., 1164 Sofia, Bulgaria Abstract The safe and long service life of structures could be assured only when adequate design and construction are combined with a proper and regular maintenance. The principal objective of this paper is to identify the most common failures that may occur in above ground cylindrical steel storage tanks in operation, to suggest better design decisions, possible solutions for repair and provide guidelines for appropriate care and maintenance of this type of structures. A group of specialists was assigned the task to conduct a site inspection and provide a statement for the operational condition of 7 new and 13 steel storage tanks in service, ow ned by State agency “State reserve and war - time stocks”. The facilities contain different oil products – petrol, diesel and mixed fuel stored at ambient temperature and atmospheric pressure. The anchorage conditions vary. Some of the examined storage tanks were built in the 1970s, others – in the period 2009 - 2014. The audit was carried out in accordance with the Agency’s internal directive and standards API 650, API 653, EN 1993-4-2, EN 14015. Based on this representative study and the practical design experience of the authors, this paper classifies the most frequently reported damage in different elements of tanks in operation – foundations, anchorage (if present), annular plates, tank bottom, shell, roof (fixed or floating), attached accessories and systems. Illustrative examples are presented, along with explanations for the critical aspects of adequate maintenance. Finally, some conclusions are drawn in the form of guidelines for failure prevention and if the damage already exists - possible ways for restoration of the facility to its proper operational state. First International Symposium on Risk and Safety of Complex Structures and Components Typical damage in steel storage tanks in operation Lyubomir Zdravkov a, *, Mariya Pantusheva a a Department of Steel, Timber and Plastic Structures, Faculty of Civil Engineering, University of Architecture, Civil Engineering and Geodesy, 1 Hristo Smirnenski Blvd., 1164 Sofia, Bulgaria Abstr ct The safe and long se vice lif of structures could be assured only when adequate design a d con truction are combin d with a per and r gular maintenance. The pri cip l objective of this paper i to identify the most common failures that may occur in above gr und ylindrical steel storage t n s in peration, o suggest better design decisions, possibl solutions for repa r and provide guidelin s for appropriate car and maintenance of his type of s ructures. Keywords: Steel storage tanks in operation, damage, design, maintenance.

Keywords: Steel storage tanks in operation, damage, design, maintenance.

* Corresponding author. Tel.: +359-885-081-305 E-mail address: zdravkov_fce@uacg.bg * Corresponding author. Tel.: +359-885-081-305 E mail address: zdravkov_fce@uacg.bg

2452-3216 © 2019 The Authors. Published by Elsevier B.V.This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review statement: Peer-review under responsibility of the First International Symposium on Risk and Safety of Complex Structures and Components organizers 2452-3216 © 2019 The Authors. Published by Elsevier B.V.This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review statement: Peer-review under responsibility of the First International Symposium on Risk and Safety of Complex Structures and Components organizers

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