A Study on Stress Corrosion Test Method for Welded Joint of Whole Pipe Section of Composite Pipe

doi:10.11885/j.issn.16745086.2021.04.30.09

Abstract

Abstract: A southwest high acid gas field planed to use bimetallic composite pipes as internal corrosion control means. In order to evaluate the corrosion resistance of welded joints of composite pipes, a finite element mechanical model of the whole pipe section was established according to its structural characteristics. The accuracy of the finite element model was verified by loading stress-strain test, and the reasonable form of stress groove and total test pressure of welds were determined. Finally, the corrosion resistance evaluation of welded joint of X52/825 metallurgical composite pipe under severe stress and corrosion conditions was carried out by independently developed corrosion evaluation device and method for the whole pipe section of bimetallic composite pipe. The results show that the welded joint of X52/825 metallurgical composite pipe is not cracked or punctured after 720 hours corrosion test under stimulated working conditions. The results of 100% X-ray flaw detection show that the welded joints of X52/825 metallurgical composite pipes have no cracks, showing its good corrosion resistance. The results of this research provide theory and reference for the performance evaluation and safety use of composite pipes in acid gas fields.

Key words: high acid gas field, bimetal clad pipe, welded joint, whole pipe section, stress corrosion cracking

CLC Number:

TE42

ZENG Dezhi, LI Zuolong, LI Fagen, WU Ze, YAN Jing. A Study on Stress Corrosion Test Method for Welded Joint of Whole Pipe Section of Composite Pipe[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(4): 129-137.

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http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2021/V43/I4/129

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