TECHICAL Series MATHEMATICS • INFORMATICS • PHYSICS Series PHILOLOGY Series ECONOMIC SCIENCES Sereies EDUCATIONAL SCIENCES Series LAW AND SOCIAL SCIENCES Series
Mechanical Properties of the Furnace Tubes from Oil Refineries and Petrochemical Plants – Part I
(Caracteristicile mecanice ale tubulaturii cuptoarelor din rafinǎriile de petrol şi instalaţiile petrochimice – Partea I)
Vol LXIX • No. 3/2017
Gheorghe Zecheru, Andrei Dumitrescu, Ibrahim Naim Ramadan
Petroleum-Gas University of Ploieşti, Bd. Bucureşti 39, Ploieşti
e-mail: gheorghe.zecheru@yahoo.ro

 Keywords   oil refineries & petrochemical plants, furnace tubes & components – PRFT, furnace coil – FC, phisical – mechanical properties of PRFT, dependability of FC

 Abstract
This paper specifies the physical – mechanical properties that shall be guaranteed for the tubes and the other components (return bends & plug headers, elbows, junction boxes, tube supports, anchors, tube guides or tube sheets), named synthetically PRFT, of the coils of petrochemical plants and oil refineries furnaces – FC. It also presents the main processes that determine the modification / alteration of these properties during the use of FC, it analyses the modalities in which these properties intervene in the FC design calculations and it highlights the influences of these properties upon the reliability, maintainability, availability, durability and safety in exploitation of FC. The original contributions of our work, concerning the FC made of PRFT manufactured from various classes of materials, are the followings: a) definition of some pertinent analytical expressions for the dependences of operating temperature on the minimum guaranteed physical – mechanical properties of PRFT materials; b) formulation of a strategy for the increase of the FC reliability and durability, based on the assessment of the effective physical – mechanical properties of PRFT materials.

 Rezumat
Lucrarea precizeazǎ caracteristicile fizico – mecanice care trebuie garantate pentru tuburile – FT şi celelalte componente (returbenţi sau cutii de īntoarcere, coturi din ţeavă, elemente fasonate de īmbinare şi/sau de racordare, plăci tubulare, suporturi, suspensii) – FP ale serpentinelor cuptoarelor din rafinǎriile de petrol şi instalaţiile petrochimice – FC, prezintӑ principalele procese care determinӑ modificarea / degradarea acestor caracteristici īn cursul utilizӑrii FC, analizeazӑ modalitӑțile īn care aceste caracteristici intervin īn calculele de proiectare ale FC şi evidențiazӑ influențele acestor caracteristici asupra fiabilitӑții, mentenabilitӑții, disponibilitӑții, durabilitӑții şi siguranței īn exploatare a FC. Contribuțiile originale ale lucrӑrii, referitoare la FC cu FT şi FP realizate din diverse clase de materiale, sunt: a) stabilirea unor expresii analitice pertinente pentru dependențele de temperatura de lucru ale caracteristicilor fizico – mecanice minime garantate ale materialelor FT şi FP; b) formularea unei strategii de creştere a fiabilităţii şi durabilităţii FC.



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