Changes in magnetic characteristics of pipes during hydraulic and pneumatic tests of trunk pipelines-Reference-Cited by-同舟云学术

Changes in magnetic characteristics of pipes during hydraulic and pneumatic tests of trunk pipelines

Published:2024-08-23 Issue:7 Volume: Page:67-71
ISSN:0130-3082
Container-title:Дефектоскопия
language:
Short-container-title:Defektoskopiâ

Author:

Myznov K. E.¹,Vasilenko O. N.¹,Kostin V. N.¹,Tronza V. S.²,Bondina A. N.²,Kukushkin S. S.²,Tryakina N. Yu.²

Affiliation:

1. M.N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences

2. LLC “Gazprom transgas Ekaterinburg”

Abstract

To identify the zones with the highest tensile stresses and deformations, a two-parameter magnetic method based on the measurement of coercive force and residual magnetic induction was applied. For realization of the method a mobile hardware and software complex DIUS-1.21M with an electromagnetic U-transducer was used, which was located along the pipe axis and along the pipe ring. Measurements were carried out on three pipes: in the first one magnetic characteristics were measured in the absence and under the influence of internal pressure; in the second and third ones — before the test and after the pipe fracture. It was revealed that internal pressure leads to the growth of residual magnetic induction in all zones both along the axis and along the ring, which indicates the occurrence of axial and circular tensile stresses in these zones, and the change of coercivity occurred ambiguously. It was found that fracture significantly increases the scatter of magnetic characteristics, which is explained by the complex nature of the stress-strain state of the fractured object.

Publisher

The Russian Academy of Sciences

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