Assessment of Stress-Strain State of Pipelines Based on the Measurements of Magnetic Characteristics in Field Conditions

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Abstract

A series of measurements on two pipeline sections made of 17G1S (17Г1С) steel using two measuring devices: magnetic multitester MMT-3 and magnetic analyser of structure KRM-C-K2M (КРМ-Ц-К2М) has been carried out. Maps of coercive force, residual magnetic induction and maximum magnetic induction on the pipes were obtained. The coefficient of loading for different cross-sections of the pipeline was calculated. Dependence of magnetic characteristics averaged over the cross-section on the coefficient of loading is plotted. It is revealed that the most dangerous for destruction cross-sections, in which the coefficient of loading exceeded the critical value of 1,2, correspond to the reduced values of coercive force and residual magnetic induction, obtained in the direction of measurement along the pipeline axis. It is shown that measurement along the axis at the top of the pipeline shows a similar relationship as for the cross-sectional averaged values, which means that in pipeline aerial crossings, measurement only at the top of the pipeline may be sufficient.

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About the authors

K. E. Myznov

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

Author for correspondence.
Email: myznov@imp.uran.ru
Russian Federation, Yekaterinburg

O. N. Vasilenko

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

Email: vasilenko@imp.uran.ru
Russian Federation, Yekaterinburg

V. N. Kostin

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

Email: kostin@imp.uran.ru
Russian Federation, Yekaterinburg

V. S. Tronza

Gazprom Transgas Yekaterinburg LLC

Email: myznov@imp.uran.ru
Russian Federation, Yekaterinburg

A. N. Bondina

Gazprom Transgas Yekaterinburg LLC

Email: myznov@imp.uran.ru
Russian Federation, Yekaterinburg

S. S. Kukushkin

Gazprom Transgas Yekaterinburg LLC

Email: myznov@imp.uran.ru
Russian Federation, Yekaterinburg

N. Yu. Tryakina

Gazprom Transgas Yekaterinburg LLC

Email: myznov@imp.uran.ru
Russian Federation, Yekaterinburg

A. S. Salomatin

Gazprom Transgas Yekaterinburg LLC

Email: myznov@imp.uran.ru
Russian Federation, Yekaterinburg

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Supplementary files

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2. Fig. 1. Diagram of the elevated crossing ‘A’

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3. Fig. 2. Diagram of the elevated crossing ‘B’

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4. Fig. 3. Simplified diagram of the pipe without showing welds

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5. Fig. 4. MMT-3 magnetic multitester

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6. Fig. 5. KPM-C-K2M magnetic structuroscope

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7. Fig. 6. Distribution (topograms) of the maximum magnetic induction on pipes ‘A’ (a, c) and ‘B’ (b, d) measured along the axis (a, b) and ring (c, d) using MMT-3

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8. Fig. 7. Distribution (topograms) of the coercive force on pipes ‘A’ (a, c) and ‘B’ (b, d) measured along the axis (a, b) and ring (c, d) using MMT-3

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9. Fig. 8. Distribution (topograms) of residual magnetic induction on pipes ‘A’ (a, c) and ‘B’ (b, d) measured along the axis (a, b) and ring (c, d) using MMT-3

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10. Fig. 9. Distribution (topograms) of the coercive force on pipes ‘A’ (a, c) and ‘B’ (b, d) measured along the axis (a, b) and ring (c, d) with the help of KPM-C-K2M

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11. Fig. 10. Dependence of coercive force averaged over four zones in the pipe cross-section measured with MMT-3 along the axis (a) and along the ring (b) on the loading factor

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12. Fig. 11. Dependence of the residual magnetic induction averaged over four zones in the pipe cross-section measured with MMT-3 along the axis (a) and along the ring (b) on the loading factor

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13. Fig. 12. Dependence of the coercive force averaged over four zones in the pipe cross-section, measured by KPM-C-K2M along the axis (a) and along the ring (b), on the loading factor

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14. Fig. 13. Dependence of values of coercive force (a) and residual magnetic induction (b) averaged over four zones in the pipe cross-section, measured with MMT-3 along the axis, on fibre stresses

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15. Fig. 14. Dependence of values of coercive force (a) and residual magnetic induction (b) measured with MMT-3 along the axis in the zones located at 12 h on the loading factor

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16. Fig. 15. Dependence of values of coercive force (a) and residual magnetic induction (b) measured with MMT-3 along the axis in the zones located at 12 h on fibre stresses

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