In this paper is proposed the estimation Method of oil&gas pipes fracture resistance, based on the results of full scale hydraulic pressure pipe testing with the artificial notch, made of the authors at 2002 - 2008. It's shown, that the fracture process at the stage of stripping (initialization) of crack can be characterized by critical fracture diagram. Calculating and experimental way to construct critical fracture diagram is suggested and discussed. The fracture resistance requirements for oil&gas pipes in terms of fracture mechanics (Kc, Lc) are formulated and proved. Analysis of requirements to fracture strength was performed and specific values of fracture toughness parameters were indicated for pipes with 1420 mm diameter made of steel of K65 strength class for operating pressure of 75 - 120 atm. The results of full scale hydraulic pressure pipe testing, based metal testing data of the standard Charpy specimens (KCV) and pipe's specification requirements are interrelated. The way to estimate the admissible temperature operation conditions of oil&gas pipes by means of based metal 'KCV - temperature' dependence is proposed.
The Method for Oil&Gas Pipes Fracture Resistance Estimation
Methode zur Bewertung der Beständigkeit gegen Bruch für Öl- und Gasrohre
2010
9 Seiten, 8 Bilder, 3 Tabellen, 3 Quellen
Conference paper
English
Betriebsdruck , Bewertungsmethode , Bruchfestigkeit , Bruchmechanik , Bruchzähigkeit , Hydraulikölleitung , Innendurchmesser , Kerbschlagzähigkeit , Kerbung , kritischer Druck , mathematische Beschreibung , mechanische Eigenschaft , Ölpipeline , Risslänge , Rohrstahl , Rohrwand , Spannungsintensitätsfaktor , Temperatureinfluss , Versuchsergebnis , Wanddicke , Zugfestigkeit
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