TECHICAL Series MATHEMATICS • INFORMATICS • PHYSICS Series PHILOLOGY Series ECONOMIC SCIENCES Sereies EDUCATIONAL SCIENCES Series LAW AND SOCIAL SCIENCES Series
Strength and Toughness Properties of Steel Pipes in the Superannuated Pipelines of the National Natural Gas Transmission System
(Caracteristicile de rezistenţă mecanică şi tenacitate ale unor conducte cu vechime foarte mare din sistemul naţional 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   superannuated pipeline, chemical composition, strength and toughness properties

 Abstract
The paper shows, analyzes and comments the results obtained by applying an experimental programme that aimed for the determination of the strength and toughness properties of pipes and welded joints of some superannuated pipelines of the national natural gas transmission system. The specimens used for this experimental programme were processed from the samples drawed from two superannuated pipelines: one sample from the pipeline Ungheni - Găneşti, operated since 1928 and one sample from the pipeline Ceanu Mare - Cluj, operated since 1948. The experimental results are analyzed and commented in terms of the current requirements regarding the strength and toughness of steel pipes for natural gas transmission pipelines.

 Rezumat
Lucrarea prezintă, analizează şi comentează rezultatele obţinute prin realizarea unui program experimental vizānd determinarea caracteristicilor de rezistenţă mecanică şi tenacitate ale ţevilor şi īmbinărilor sudate ale unor conducte foarte vechi din sistemul de transport al gazelor naturale. Epruvetele folosite la realizarea programului experimental au fost obţinute din două eşantioane prelevate din tubulatura unor conducte vechi: un eşantion prelevat din tubulatura conductei Ungheni ? Găneşti, pusă īn funcţiune īn 1928 şi un eşantion prelevat din tubulatura conductei Ceanu Mare ? Cluj, pusă īn funcţiune īn 1948. Rezultatele experimentale sunt analizate şi comentate prin prisma cerinţelor actuale privind rezistenţa mecanică şi tenacitatea ţevilor din oţel pentru conductele de transport al gazelor naturale.



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