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

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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.

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K. Myznov

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

编辑信件的主要联系方式.
Email: myznov@imp.uran.ru
俄罗斯联邦, 620108 Yekaterinburg, S. Kovalevskaya Street, 18

O. Vasilenko

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

Email: vasilenko@imp.uran.ru
俄罗斯联邦, 620108 Yekaterinburg, S. Kovalevskaya Street, 18

V. Kostin

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

Email: vasilenko@imp.uran.ru
俄罗斯联邦, 620108 Yekaterinburg, S. Kovalevskaya Street, 18

V. Tronza

LLC “Gazprom transgas Ekaterinburg”

Email: myznov@imp.uran.ru
俄罗斯联邦, 620075 Yekaterinburg, Clara Zetkin Street, 14

A. Bondina

LLC “Gazprom transgas Ekaterinburg”

Email: myznov@imp.uran.ru
俄罗斯联邦, 620075 Yekaterinburg, Clara Zetkin Street, 14

S. Kukushkin

LLC “Gazprom transgas Ekaterinburg”

Email: myznov@imp.uran.ru
俄罗斯联邦, 620075 Yekaterinburg, Clara Zetkin Street, 14

N. Tryakina

LLC “Gazprom transgas Ekaterinburg”

Email: myznov@imp.uran.ru
俄罗斯联邦, 620075 Yekaterinburg, Clara Zetkin Street, 14

参考

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2. Fig. 1. Distribution of the coercive force through the pipe before the hydraulic test (a, c) and during the hydraulic test (b, d), measured along the axis (a, b) and along the ring (c, d); × are the points at which the measurements were carried out.

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3. Fig. 2. Distribution of the residual magnetic induction through the pipe before the hydraulic test (a, c) and during the hydraulic test (b, d), measured along the axis (a, b) and along the ring (c, d); × are the points at which the measurements were carried out.

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4. Fig. 3. Distribution of coercive force (a), residual (b) and maximum (c) magnetic induction through the pipe after destruction as a result of hydraulic tests measured in the axis direction; ― — weld; × — points at which measurements were carried out.

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5. Fig. 4. Distribution of coercive force along the initiator pipe before pneumatic testing (a, c) and after destruction (b, d), measured along the axis (a, b) and along the ring (c, d); - . ― — the label; × — the points at which the measurements were carried out.

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6. Fig. 5. Distribution of residual magnetic induction along the initiator pipe before pneumatic testing (a, c) and after destruction (b, d), measured along the axis (a, b) and along the ring (c, d); - . ― — the label; × — the points at which the measurements were carried out.

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