TECHICAL Series MATHEMATICS • INFORMATICS • PHYSICS Series PHILOLOGY Series ECONOMIC SCIENCES Sereies EDUCATIONAL SCIENCES Series LAW AND SOCIAL SCIENCES Series
Modeling Gas Flow through Pipes' Bracks
(* Universitatea Petrol-Gaze din Ploieşti, Bd. Bucureşti, 39, Ploieşti e-mail: ctrifan@upg-ploiesti.ro ** E.ON Gaz România, Regiunea Est e-mail: dumitru.olteanu@eon-gaz-romania.ro *** E.ON Gaz Distribuţie, Centrul Operaţional Piatra Neamţ e-mail: remus.herda@eon-gaz-distributie.ro **** Transgaz Medias, Exploatarea Teritorială Bucureşti, Sectorul Ploieşti e-mail: tiberiu4eternity@zahoo.com)
Vol LX • No. 4/2008
Cornel Trifan*, Dumitru Olteanu**, Remus Herda***, Tiberiu Florin Trifan****
* Universitatea Petrol-Gaze din Ploieşti, Bd. Bucureşti, 39, Ploieşti
e-mail: ctrifan@upg-ploiesti.ro
** E.ON Gaz România, Regiunea Est
e-mail: dumitru.olteanu@eon-gaz-romania.ro
*** E.ON Gaz Distribuţie, Centrul Operaţional Piatra Neamţ
e-mail: remus.herda@eon-gaz-distributie.ro
**** Transgaz Medias, Exploatarea Teritorială Bucureşti, Sectorul Ploieşti
e-mail: tiberiu4eternity@zahoo.com

 Keywords   gas losses, pipe, brack, soil, pressure

 Abstract
This paper presents a calculation procedure for gas losses through the bracks appeared on the interred gas pipelines. The mathematical model of gas flow through the bracks of the pipelines buried in soil is solved by a numerical finite-element procedure, using the ANSYS 10.0 software, for various diameter and pressure values. By means of this procedure, for a wide range of pipe diameters, brack sizes and pressure values, the pressure gradient in the brack area and lost gas flow rate can be calculated.

 Rezumat
Lucrarea prezintă o metodologie de calcul a pierderilor de gaze prin defectele conductelor îngropate. Modelul matematic al curgerii gazelor prin defectele conductelor îngropate în sol este rezolvat printr-o metodă numerică cu elemente finite cu programul ANSYS versiunea 10.0. pentru diverse diametre şi presiuni. Cu ajutorul acestei metodologii, pentru diverse diametre de conductă, mărimi ale defectelor şi presiuni se poate calcula gradientul presiunii în zona defectului, precum şi debitul de gaze ce se pierde.



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