Technical Diagnostics and Non-Destructive Testing, 2020, №03



2020 №03 (03)

DOI of Article 10.37434/tdnk2020.03.04

2020 №03 (05)

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Technical Diagnostics and Non-Destructive Testing #3, 2020, pp. 30-36

From the experience of using non-destructive control methods to assess the technical condition of the pipeline emergency section

O.P. Gopkalo¹, P.S. Yukhymets², G.Ya. Bezlyudko³, R.M. Solomacha³, V.O. Nekhotiashchiy¹

¹1G.S. Pisarenko Institute for Problems of Strength of NAS of Ukraine. 2 Timiryazevska Str., 01014, Kyiv, Ukraine. E-mail: ips@ipp.kiev.ua
²E.O. Paton Electric Welding Institute of NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua
³LLC «Special Scientific Developments». PO box 12036, 61184, Kharkiv, Ukraine

An example of diagnosing the technical condition of the emergency section of oil storage pipeline by non-destructive methods of control is given. Proceeding from the results of inspection of an emergency section of the pipeline (measurement of hardness, ovality of pipes and coercive force Нс) the characteristics of static strength of metal pipes were determined, and the relative load, structural condition of metal and level of damages were evaluated. Coercytimetric control showed that the level of total maximum stresses obtained first during the installation of the structure, and then after the accident and restoration of the initial position of the individual elements of the pipeline relative to the supports, was less than 30% of the conditional yield strength of metal. This estimate corresponds to the data of calculations of the stress-strain state (SSS) and is consistent with the results of measuring the ovality of the pipes and the absence of local plastic deformations in the most stressed areas. Coercimetric diagnostics revealed differences in the steel grades used in some sections of the pipeline. 7 Ref., 1 Tabl., 9 Fig.
Keywords: stress, strain, load, damage, structuroscope, coercive force

Received: 05.08.2020

References

1. Lepesh, G.V. (2015) Modern methods and means for diagnostics of equipment of engineering systems of buildings and facilities. Tekhniko-Tekhnologicheskie Problemy Servisa, 4(34), 3–8 [in Russian].
2. Lepesh, G.V. (2015) Diagnostics and comprehensive servicing of engineering technical systems and equipment of buildings and facilities. Ibid., 5(35), 6–16 [in Russian].
3. GOST 8732-78: Seamless hot-deformed steel pipes. Range of sizes [in Russian].
4. ТU 14-3-377: Steel pipes welded straight-seam for the main gas and oil pipelines. Specifications [in Russian].
5. Software package ASTRA-MAGISTR - 2011 (version 201010). Automated computation of the main pipelines for static and cyclic strength, seismic impact, vibration strength and unsteady dynamic processes in keeping with the requirements of SNiP 2.05.06-85 norms [in Russian].
6. (1990) Strength of welded joints under alternating loads. Ed. by V.I. Trufyakov. PWI. Kiev, Naukova Dumka.
7. Gopkalo, O.P., Bezlyudko, G.Ya., Kotliarenko, A.A. et al. (2020) Diagnosis of damage to ferromagnetic steels during mechanical loading by results of measurements of coercive force. Tekh. Diahnost. ta Neruiniv. Kontrol, 2, 13-21 [in Ukrainian].

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