The Paton Welding Journal, 2018, №05



2018 №05 (04)

DOI of Article 10.15407/tpwj2018.05.05

2018 №05 (06)

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The Paton Welding Journal, 2018, #5, 20-26 pages
 

Application of leak before break criterion for prevention of avalanche fracture of the wall of vertical welded tanks

A.Yu. Barvinko, Yu.P. Barvinko, A.N. Yashnik and V.N. Miryanin

E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazimir Malevich Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua
 
The paper deals with the possibility of improving the performance of oil storage tanks of 50–120 thou m³ capacity through application of normalized sheet steel 09G2SYuch-U390 and 09KhG2SYuch-U440 for design rings of tank wall. A relationship between the length of through-thickness fatigue crack in the butt welded joint of the studied steel and number of tank loading cycles was derived experimentally under the conditions of plane deformation at the initial stage of through-thickness crack propagation. Based on the obtained relationship, it was established that after formation of a through-thickness crack in the welded joint of the wall and appearance of oil leakage, there is sufficient time and conditions for its visual detection and taking measures for elimination of the detected defect. The possibility of application of this method to detect the through-thickness crack is proof of the fact that tanks with design rings from the studied steel satisfy the leak before creak criterion. 19 Ref., 5 Tables, 4 Figures.
Keywords: oil storage tanks, fatigue crack, cyclic loading, butt welded joint, avalanche fracture, leak before break criterion
 
Received:                05.03.18
Published:               07.05.18
 
 
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