The Paton Welding Journal, 2012, №01



2012 №01 (01)

2012 №01 (03)

---

The Paton Welding Journal, 2012, #1, 6-9 pages  

RISK OF FAILURE IN THINNING OF MAIN PIPELINE WALL AT THE AREA OF CIRCUMFERENTIAL WELDS IN THE PRESENCE OF BENDING MOMENTS ALONG THE PIPELINE AXIS

V.I. MAKHNENKO, E.A. VELIKOIVANENKO, G.F. ROZYNKA, N.I. PIVTORAK and O.I. OLEJNIK

E.O. Paton Electric Welding Institute, NASU, Kiev, Ukraine
 
 
Abstract
The effect of longitudinal bending moment in pipeline with a wall thinning defect of large overall size in circumferential direction on the risk of failure is considered. It is shown that the critical sizes of thinning in circumferential direction can be determined with a certain conservatism on the basis of total nominal stresses induced by bending and internal pressure in pipeline.
 
 
Keywords: main pipelines, critical sizes of defects of wall thinning, effect of bending moment, risk of failure, Weibull distribution
 
 
Received:                11.10.11
Published:               28.01.12
 
 
References
1. (2000) Fitness-for-service: American Petroleum Institute Recommended Practice 579. 1st ed.
2. Makhnenko, V.I. (1976) Computational methods of investigation of welding stress and strain kinetics. Kiev: Naukova Dumka.
3. MRK-KhR-2000: Procedure for determination of residual life of WWER nuclear reactor body during service. Moscow; St.-Petersburg.

---