Inclinometric measurements on the pipeline to assess its stress-strain state in laboratory conditions

UDK: 622.692.4.01:539.4
DOI: 10.24887/0028-2448-2022-4-78-82
Key words: изгиб, инклинометрическая технология, лабораторная установка, напряженно-деформированное состояние (НДС), трубопровод
Authors: A.A. Ignatik (Ukhta State Technical University, RF, Ukhta)

To ensure reliability of the main pipeline during operation it is necessary assessing the strength of the pipeline that is subjected by a complex of loads. The stress-strain state monitoring of the pipeline contributes to the solution of this problem since the values of stresses (strains) obtained during monitoring are the initial data for pipe strength calculations. Continuous assessment and monitoring of the stress-strain state is especially necessary for main pipelines laid in difficult geological and engineering conditions. Various methods are known either for assessing the pipeline stress-strain state that consist of determining the spatial position of the main pipeline and further calculating the stress-strain state components or in directly measuring stresses or strains by some physical method. It is important that the method provides continuous pipeline monitoring.

In this article, an inclinometric technology is proposed to determine the spatial position and curvature of the main pipeline. The technology was tested in laboratory conditions on the bench that is a pipe installed on two supports. The laboratory bench allows loading the pipe with a bending force in the vertical plane. In the experiments, a portable digital inclinometer was used, it measures inclination angles of the pipe during bending. Plots of the tangent of the inclination angle, deformation and curvature of the upper, lateral and lower pipe zones are obtained. Therefore, the inclinometric method is effective. The data of inclinometric measurements allow calculating the components of the pipeline stress-strain state according to known formulas. Guidance on implementation of inclinometric technology in practice for monitoring the pipeline stress-strain state including specifying the installation location of inclinometric sensors on the pipeline is given. Inclinometric sensors provide continuous monitoring of the main pipeline position and assessment of its stress-strain state.

References

1. Islamov R.R., Aginey R.V., Isupova E.V., Analysis of ways and methods of monitoring the stressed state of underground oil and gas pipelines, working in complicated engineering-geological conditions (In Russ.), Transport i khranenie nefteproduktov i uglevodorodnogo syr'ya, 2017, no. 6, pp. 31–40.

2. Feodos'ev V.I., Soprotivlenie materialov (Strength of materials), Moscow: Publ. of MSTU named after N.E.Bauman, 1999, 592 p.

3. Sharafutdinov Z.Z., Urmancheev S.F., Kapaev R.A., Assessment the readiness of the well for pipeline pulling during the construction of underwater crossing  (In Russ.), Nauka i tehnologii truboprovodnogo transporta nefti i nefteproduktov = Science & Technologies: Oil and Oil Products Pipeline Transportation, 2020, V. 10, no. 5, pp. 470–478, DOI: 10.28999/2541-9595-2020-10-5-470-478

4. Ignatik A.A., Stress-strain state characteristics of pipeline wall under the internal pressure, bending, and torsion (In Russ.), Gazovaya promyshlennost', 2020, no. 4, pp. 102–107.

5. Aginey R.V. et al., Development of the mathematical model for assessing the optimal measurement step when surveying the depth of the underground pipeline from the ground (In Russ.), Nauka i tehnologii truboprovodnogo transporta nefti i nefteproduktov = Science & Technologies: Oil and Oil Products Pipeline Transportation, 2020, V. 10, pp. 4, pp. 364–371, DOI: 10.28999/2541-9595-2020-10-4-364-371

6. Kuz'bozhev A.S., Birillo I.N., Berdnik M.M., Investigation of the stress-strain state of the pipeline in the area of single dent and dent interacting with metal loss defect (In Russ.), SOCAR Proceedings, 2018, no. 4, pp. 43–49, DOI: 10.5510/OGP20180400369

7. Islamov R.R., Sovershenstvovanie sistemy monitoringa tekhnicheskogo sostoyaniya protyazhennykh uchastkov magistral'nykh neftegazoprovodov primeneniem volokonno-opticheskikh sensorov deformatsii (Improving the monitoring system for the technical condition of long sections of oil and gas pipelines using fiber-optic strain sensors): thesis of candidate of technical science, Ukhta, 2018. 

To ensure reliability of the main pipeline during operation it is necessary assessing the strength of the pipeline that is subjected by a complex of loads. The stress-strain state monitoring of the pipeline contributes to the solution of this problem since the values of stresses (strains) obtained during monitoring are the initial data for pipe strength calculations. Continuous assessment and monitoring of the stress-strain state is especially necessary for main pipelines laid in difficult geological and engineering conditions. Various methods are known either for assessing the pipeline stress-strain state that consist of determining the spatial position of the main pipeline and further calculating the stress-strain state components or in directly measuring stresses or strains by some physical method. It is important that the method provides continuous pipeline monitoring.

In this article, an inclinometric technology is proposed to determine the spatial position and curvature of the main pipeline. The technology was tested in laboratory conditions on the bench that is a pipe installed on two supports. The laboratory bench allows loading the pipe with a bending force in the vertical plane. In the experiments, a portable digital inclinometer was used, it measures inclination angles of the pipe during bending. Plots of the tangent of the inclination angle, deformation and curvature of the upper, lateral and lower pipe zones are obtained. Therefore, the inclinometric method is effective. The data of inclinometric measurements allow calculating the components of the pipeline stress-strain state according to known formulas. Guidance on implementation of inclinometric technology in practice for monitoring the pipeline stress-strain state including specifying the installation location of inclinometric sensors on the pipeline is given. Inclinometric sensors provide continuous monitoring of the main pipeline position and assessment of its stress-strain state.

References

1. Islamov R.R., Aginey R.V., Isupova E.V., Analysis of ways and methods of monitoring the stressed state of underground oil and gas pipelines, working in complicated engineering-geological conditions (In Russ.), Transport i khranenie nefteproduktov i uglevodorodnogo syr'ya, 2017, no. 6, pp. 31–40.

2. Feodos'ev V.I., Soprotivlenie materialov (Strength of materials), Moscow: Publ. of MSTU named after N.E.Bauman, 1999, 592 p.

3. Sharafutdinov Z.Z., Urmancheev S.F., Kapaev R.A., Assessment the readiness of the well for pipeline pulling during the construction of underwater crossing  (In Russ.), Nauka i tehnologii truboprovodnogo transporta nefti i nefteproduktov = Science & Technologies: Oil and Oil Products Pipeline Transportation, 2020, V. 10, no. 5, pp. 470–478, DOI: 10.28999/2541-9595-2020-10-5-470-478

4. Ignatik A.A., Stress-strain state characteristics of pipeline wall under the internal pressure, bending, and torsion (In Russ.), Gazovaya promyshlennost', 2020, no. 4, pp. 102–107.

5. Aginey R.V. et al., Development of the mathematical model for assessing the optimal measurement step when surveying the depth of the underground pipeline from the ground (In Russ.), Nauka i tehnologii truboprovodnogo transporta nefti i nefteproduktov = Science & Technologies: Oil and Oil Products Pipeline Transportation, 2020, V. 10, pp. 4, pp. 364–371, DOI: 10.28999/2541-9595-2020-10-4-364-371

6. Kuz'bozhev A.S., Birillo I.N., Berdnik M.M., Investigation of the stress-strain state of the pipeline in the area of single dent and dent interacting with metal loss defect (In Russ.), SOCAR Proceedings, 2018, no. 4, pp. 43–49, DOI: 10.5510/OGP20180400369

7. Islamov R.R., Sovershenstvovanie sistemy monitoringa tekhnicheskogo sostoyaniya protyazhennykh uchastkov magistral'nykh neftegazoprovodov primeneniem volokonno-opticheskikh sensorov deformatsii (Improving the monitoring system for the technical condition of long sections of oil and gas pipelines using fiber-optic strain sensors): thesis of candidate of technical science, Ukhta, 2018. 



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