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2010 №10 (01) 2010 №10 (03)

The Paton Welding Journal 2010 №10


TPWJ, 2010, #10, 6-9 pages
 
OPTIMAL REDUCTION OF WORKING PRESSURE IN PIPELINES FOR WELDING REPAIR OF THINNING REGIONS


Journal                    The Paton Welding Journal
Publisher                 International Association «Welding»
ISSN                       0957-798X (print)
Issue                       № 10, 2010 (October)
Pages                      6-9
 
 
Authors
V.I. MAKHNENKO, V.S. BUT, S.S. KOZLITINA, L.I. DZYUBAK and O.I. OLEJNIK
E.O. Paton Electric Welding Institute, NASU, Kiev, Ukraine
 
 
Abstract
The possibility of using welding to repair defects of corrosion origin in walls of pressurised pipelines is considered. It is shown that the safety of welding operations is affected not only by the overall size of a defect, but also by the shape of a pipe wall thinning. Calculation algorithms are applied to substantiate the possibility of repair of defects by overlaying welding due to optimal reduction of internal pressure in the main line for a period of repair.
 
 
Keywords: main pipeline, welding repair, overlaying welding, sizes of defects, residual thickness of pipe wall, optimal pressure
 
 
Received:                ??.??.??
Published:               28.10.10
 
 
References
1. (2000) Fitness-for-service: American Petroleum Institute Recommended Practice 579.
2. VRD 39-1.10-004-99: Procedure recommendations on quantitative assessment of state of main gas pipelines with corrosion defects, their ranking by the hazard degree and determination of residual life. Moscow: Gazprom.
3. RD EO 0571-2006: Standards for permissibility of thickness of pipeline elements made from carbon steels. Moscow: Rosenergoatom.
4. Makhnenko, V.I., But, V.S., Kozlitina, S.S. et al. (2010) Risk of fracture of pressurized main pipeline with defects of the type of wall thinning during repair. The Paton Welding J., 1, 7-10.