«Equipment and technologies for oil and gas complex»

Influence of stress concentrators on operational safety of gas pipelines sections in a non-project position

UDC: 622.691:620.1+624.04
DOI: -

Authors:

¹ EKSIKOM, Moscow, Russia
² PKB "BK", Ufa, Russia
³ Central Aerohydrodynamic Institute named after N.E. Zhukovsky, Zhukovsky, Russia

Keywords: gas pipeline, stress concentration coefficient, load factor, local tensions, gas pipeline non-project position, longitudinal tension

Annotation:

The authors of the article present the results of studying longitudinal tension of gas pipeline sections being in a non-project position as well as the dependences of the stress concentration coefficient of the metal loss defect area on the defect dimensions. Computational and experimental assessment of longitudinal tension was made on a gas pipeline of 1420 mm diameter with the pipe wall thickness of 16,8 mm produced by "Mannessmann" factory. Computational research of stress concentration coefficients dependence on defects dimensions were performed by the final elements method. The research object was a pipe of 1420 mm diameter with the pipe wall width of 15,7 mm with corrosion defects of various length, width and depth. The research data showed that the stress concentration coefficients, varying from zero of the defect depth and width, can change from 1 to 3, while varying from zero of the defect depth and length, they can change from 1 to 4. While performing computational and experimental assessment of longitudinal tensions, the spatial position was geodetically surveyed, after which, by applying the standard methodology, the longitudinal tension was assessed for determining the load factor computation, which is crucial for the decision making on the further operation of the gas pipeline part. The research results proved the fact that at the load factor of 0,6 at the first section of the pipeline and 0,402 at the second section according to the regulatory documentation, no engineering work eliminating the non-project position of the gas pipeline is required. Under assuming that there is metal loss defect tolerable for the load model of internal pressure solely in the maximum longitudinal tension area, then the load factors equal to 1,29 for the first section and 0,91 for the second section. At the load factor equals to 0,91, the gas pipeline section can be operated without repair, and at the load factor of 1,29, maintenance of the gas pipeline section should be subjected to repairing.

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