(EVALUATION METHODS FOR PIPE METAL FRACTURE TOUGHNESS OF MAIN GAS PIPELINES. RM-600 PULL TEST MACHINE FOR TESTING OF FULL-THICKNESS PIPE STEEL SPECIMENS)
The paper contains an overview of methods for evaluating resistance to longitudinal plastic fracture of modern high-strength pipe steels used for main pipelines’ construction. The required steel ductility is commonly evaluated by dynamic Charpy V-notch test. Full-thickness specimens are also drop-weight tested. Both methods have certain deficiencies, especially when applied to modern viscous plastic steels.
High-strength pipes are certified at a special-purpose testing ground in Kopeysk (Chelyabinsk Oblast) where they are undergo full-scale pneumatic tests simulating emergency destruction of a gas pipeline. This is a bulk and labor-intensive testing and it does not always provide objective information on steel ductility that is sufficient to completely stop crack spreading within three pipes. Tool-based method of dynamic fracture in large metal specimens with crack propagation speeds close to actual speeds observed at testing grounds is considered as an adequate alternative to lab testing and an addition to pipe string ground tests.
PJSC Gazprom has developed and manufactured the RM-600 pull test machine for strain testing of flat full-thickness pipe steel specimens used for main gas pipelines at static and dynamic loads. Dynamic fracture testing of specimens conducted at the RM-600 pull test machine has shown the results comparable to those performed at testing grounds. Moreover, lab conditions of specimen destruction such as crack propagation speed, stress-strain state, and the crack top plastic zone are close to crack propagation conditions in a main gas pipeline.
A.I. Abakumov, PhD in Physics and Mathematics, Russian Federal Nuclear Center – All-Russian Research Institute of Experimental Physics (Sarov, Russia), AIAbakumov@vniief.ru
I.I. Safronov, PhD in Physics and Mathematics, Russian Federal Nuclear Center – All-Russian Research Institute of Experimental Physics, IISafronov@vniief.ru
A.S. Smirnov, Russian Federal Nuclear Center – All-Russian Research Institute of Experimental Physics, ASSmirnov@vniief.ru
A.V. Sirenko, PhD in Physics and Mathematics, Russian Federal Nuclear Center – All-Russian Research Institute of Experimental Physics, AVSirenko@vniief.ru
S.K. Gruzdev, Russian Federal Nuclear Center – All-Russian Research Institute of Experimental Physics, SKGruzdev@vniief.ru
A.B. Arabey, PhD in Engineering, Gazprom VNIIGAZ LLC (Moscow, Russia), A.Arabey@vniigaz.gazprom.ru
N.B. Nesterov, PhD in Engineering, PJSC Gazprom (Saint Petersburg, Russia), N.Nesterov@adm.gazprom.ru
A.S. Popkov, PhD in Engineering, PJSC Gazprom, A.S.Popkov@adm.gazprom.ru
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