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Easy-to-use Mathcad Computer Methods for Interconversion of Petroleum Distillation Curves. Part 3. ASTM - TBP (True Boiling Point)
(Transpunere īn Mathcad uşor de utilizat pe calculator a metodelor API de interconversie a curbelor de distilare ale fracţiunilor petroliere. Partea a 3-a. Proceduri de interconversie a curbelor SR ISO şi PRF (Puncte Reale de Fierbere) scrise īn Mathcad folosind funcţii compuse)
Vol LXIII • No. 2/2011
Liviu Filotti
Universitatea Petrol-Gaze din Ploiesti, Bd. Bucuresti 39, Ploiesti,
e-mail : lfilotti@upg-ploiesti.ro; lfilotti@yahoo.com

 Keywords   ASTM D 86, TBP, distillation, interconversion, Mathcad, petroleum.

 Abstract
The procedures recommended by API [2] for the interconversion of ASTM D 86 and TBP (True Boiling Point) distillation curves are transposed into Mathcad computation platform. Herein presented Mathcad version for both direct, ASTM to TBP, and backward, TBP to ASTM, curves conversions are more concise, easier to use and of a more general application than versions given in previous two parts [1a, b]. In the Mathcad version given in this third part the relations of the API procedure are written in Mathcad as functions and composed functions, in a sequence which finally allows use of the procedure as a single variable function by a unique call. The utilization of Mathcad-written procedures is illustrated with examples.

 Rezumat
Procedurile recomandate de API (American Petroleum Institute [2]) pentru interconversia curbelor de distilare SRO (cf. SR ISO 3405:1998, īn trecut "STAS", cf. STAS 36-1980 ; echivalent cu ASTM D 86) şi PRF (Puncte Reale de Fierbere, aproximativ cf. STAS 2150-1980) au fost transpuse īn platforma Mathcad. Versiunile Mathcad prezentate īn această parte a lucrării, atāt pentru trecerea de la curba ASTM la curba PRF cāt şi pentru transformarea inversă, de la curba PRF la curba de distilare ASTM, sunt mai concise, mai uşor de utilizat şi de o aplicabilitate mai generală decāt versiunile date īn precedentele părţi [1a, b]. Īn prezenta versiune relaţiile folosite de către procedura API sunt scrise īn Mathcad sub formă de funcţii sau de funcţii compuse, īntr-o secvenţă ce īn final permite utilizarea procedurii īntr-o unică apelare a unei funcţii de o singură variabilă. Folosirea procedurilor transpuse īn Mathcad este ilustrată cu exemple.



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