«Equipment and technologies for oil and gas complex»

Residual and local stresses level assessment in the gas pipeline corrosion damage zone

UDC: 662.691.4.004
DOI: -

Authors:

¹ EKSIKOM, Moscow, Russia
² Central Aerohydrodynamic Institute named after N.E. Zhukovsky, Zhukovsky, Russia

Keywords: pipeline, stresses concentration coefficient, finite element method, local stresses, residual stresses

Annotation:

The authors of the article present analysis results of the local stress-strain gas pipeline state with corrosion defects and the experimental definition of residual technological stresses in pipe coils of 1420 mm diameter produced by Mannesmann factory and Hartsyz Pipe Rolling Factory, and in pipe coils of 420 mm diameter, produced by Mannesmann factory, as well as in the pipeline of 530 mm diameter located in the landslip area. Estimation researches of the local stress-strain condition were performed using the finite element method on the pipe of 1420 mm diameter with corrosion defects of various length, width and depth. The estimation results showed that in the stress concentration zone the allowable pressure even in case of availability of corrosion defect of 17,2 % relative depth of the pipe wall thickness is lower than the normative pressure. Experimental research of residual technological stresses using the tensometry method by probing a non-through hole showed their high level. So, in Mannesmann factory pipe maximum tensile ring residual stresses equal to 258 MPa and in The Hartsyz Pipe Rolling Factory pipe they equal to 162 MPa. Comparison of maximum tensile ring residual stresses, acting in pipes of 1420 mm diameter, with tensile ring maximal residual stresses in Mannesmann pipes of 402 mm diameter showed that the tensile ring residual stresses in the pipe of 402 mm diameter are much lower and they do not exceed 65 MPa. As the small diameter pipes do not practically form stress corrosion fractures, this result indirectly shows that residual stresses have significant effect on the process of stress corrosion fracture occurrence. For the pipeline of 530 mm diameter located in a landslip area, using the tensometry method by probing a non-through hole, it was revealed that longitudinal and ring stresses account to 88 % of the allowable stresses level, which is likely to lead to an emergency situation.

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