The Paton Welding Journal, 2014, №06



2014 №06 (40)

DOI of Article 10.15407/tpwj2014.06.01

2014 №06 (02)

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The Paton Welding Journal, 2014, #6-7, 4-9 pages  

ENSURING INTEGRITY OF WELDED STRUCTURES AND CONSTRUCTIONS AT THEIR LONG-TERM SERVICE WITH APPLICATION OF RENOVATION TECHNOLOGIES

O.I. STEKLOV¹, A.A. ANTONOV¹ and S.P. SEVOSTIANOV²

¹I.M. Gubkin Russian State University of Oil and Gas. 65 Leninsky Ave., 119991, Moscow, RF. E-mail: svarka@gubkin.ru
²Company «Gazprom VNIIGAZ». PO 130, 115583, Moscow, RF. E-mail: VNIIgaz@vniigaz.gazprom.ru
 
 
Abstract
Main pipelines in the Russian Federation have been in operation for a long time. Rate of failures in them because of initiation of various corrosion and stress-corrosion defects has increased. Application of welding repair technologies allows considerably lowering the risk of pipeline integrity violation. However, application of welding technologies in repair of pipelines in long-term service requires allowing for additional factors, which are not encountered in work performance on new pipelines. This and additional weldability studies, as well as certain requirements to welding consumables and allowing for stressed state resulting from application of renovation welding technologies, are described in this paper. 9 Ref., 8 Figures.
 
 
Keywords: main pipeline, repair technologies, weldability, corrosion, stress corrosion cracking, requirements to welding consumables, residual stresses, ultrasonic impact treatment
 
 
Received:                21.04.14
Published:               28.09.14
 
 
References
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2. Varlamov, V.L., Kanajkin, V.A., Matvienko, A.F. et al. (2012) Monitoring of defects and prediction of state of Russian main gas pipelines. Ekaterinburg: UNPTs.
3. Steklov, O.I. (2006) Complex technical diagnostics of main gas-and-oil pipelines. Territoriya Neft i Gaz, 4, 20-23; 5, 12-17; 6, 48-55.
4. Varlamov, D.P., Dedeshko, V.N., Kanajkin, V.A. et al. (2012) Improvement of reliability of main gas pipelines by using repeated in-pipe flaw detection. The Paton Welding J., 3, 20-25.
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6. Steklov, O.I., Shafikov, R.R., Sevostianov, S.P. (2009) Theoretical-experimental substantiation of possibility of main pipeline repair using welding technologies without interrupting of gas pumping. Svarochn. Proizvodstvo, 7, 12-17.
7. Steklov, O.I., Varlamov, V.P. (2012) Assessment of threshold stress level of corrosion cracking in system of main pipelines. Truboprovod. Transport (Teoriya i Praktika), 3, 4-9.
8. Antonov, A.A., Steklov, O.I., Antonov, A.A. (Jr) et al. (2010) Investigation of technological residual stresses in welded joints of main pipelines. Zagot. Proizvodstvo v Mashinostroenii, 3, 13-19.
9. Antonov, A.A., Letunovsky, A.P. (2012) Reduction of residual welded stresses by ultrasonic peening method. Truboprovod. Transport (Teoriya i Praktika), 2, 21-26.

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