TECHICAL Series MATHEMATICS • INFORMATICS • PHYSICS Series PHILOLOGY Series ECONOMIC SCIENCES Sereies EDUCATIONAL SCIENCES Series LAW AND SOCIAL SCIENCES Series
Temporal Evolution of the Steel Pipes Quality Requirements for the Natural Gas Transmission Pipelines
(Evoluţia temporală a cerinţelor de calitate impuse ţevilor din oţel pentru conductele de transport al gazelor naturale)
Vol LXV • No. 4/2013
Gheorghe Zecheru*, Ilie E. Laţa**, Florin Bīrsan**, Gheorghe Drăghici*, Alin Diniţă*
* Universitatea Petrol-Gaze din Ploieşti, Bd.Bucureşti 39, Ploieşti
e-mail: gzecheru@upg-ploiesti.ro
** S.N.T.G.N. "TRANSGAZ" S.A., Pta. Constantin I. Motaş 1, Mediaş
e-mail: ilie.lata@transgaz.ro

 Keywords   transmission pipeline, steel pipes, chemical composition, strength and toughness requirements

 Abstract
In this paper there is outlined the analysis performed by the authors regarding the temporal evolution of the steel pipes quality requirements for the natural gas transmission pipelines. It shows the history of the implementation of prescriptions regarding the chemical composition and the tensile mechanical characteristics, focusing mainly on the implementation of requirements regarding the toughness in the standards that refer to the pipe quality, but also on the qualitative evolution of these prescriptions, consisting in passing from the toughness checkings based on the impact energy (determined by the notched-bar impact test), to checkings based on the percet shear area ( having a fibrous appearance) on the impact fracture surface (determined by the drop-weight tear test - DWTT) and to the checkings based on the crack tip opening displacement (determined by fracture mechanics tests).

 Rezumat
Lucrarea prezintă analiza efectuată de autori privind evoluţia de-a lungul timpului a condiţiilor privind calitatea impuse ţevilor din oţel destinate construirii conductelor aparţinānd sistemelor de transport al gazelor naturale. Se prezintă istoricul introducerii prescripţiilor privind compoziţia chimică şi caracteristicile mecanice la tracţiune, insistāndu-se mai ales asupra introducerii cerinţelor privind tenacitatea īn standardele referitoare la calitatea ţevilor pentru conducte, cāt şi asupra evoluţiei calitativă a acestor prescripţii, constānd īn trecerea de la verificările de tenacitate bazate pe energia de rupere (determinată prin īncercarea la īncovoiere prin şoc), la verificările bazate pe ponderea zonelor cu aspect fibros pe suprafeţele de rupere prin şoc (determinate prin DWTT) şi la verificările bazate pe deplasarea de deschidere la vīrful fisurii (determinate prin īncercări de mecanica ruperii).



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