Donatie la Petrom, sau altceva?

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Re: Donatie la Petrom, sau altceva?

Postby sebastian stan » 28 Jan 2013, 01:03

Lichidele nu se dilata/contracta! Lege a fizicii!


orice lucru lăsat de Dumnezeu pe pământul ăsta suportă dilatări/contracții. Cuantumul lor diferă!
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Re: Donatie la Petrom, sau altceva?

Postby Gabilsson » 29 Jan 2013, 00:33

Am spus o prostie mare cat mine! Ma gandeam la compresie. Si asta e posibila de fapt dar in practica de zi cu zi se poate spune ca lichidele nu se comprima.

Am gasit un raport si citind rapid printre randuri am aflat ca, grosso modo, benzina isi modifica volumul cu 1% la 8-9 grade celsius diferenta de temperatura. De aici putem trage concluzia, probabil, ca o pompa setata sa masoare volumul combustibilului vara (sa zicem la 30 de grade) va calcula eronat volumul de combustibil iarna (sa zicem la -10 grade) pt ca avem o diferenta de 40 de grade celsius, respectiv 4,4-5% (simplu gandit 100l vara devin 94-95l iarna)

Totusi este posibil ca aceasta gandire sa fie gresita daca ne uitam la apa care se dilata odata cu cresterea temperaturii de la 4 grade celsius dar si cu scaderea ei de la 4 grade! Daca asa se intampla si cu benzina nu stiu. Cine vrea sa afle mai multe poate sa citeasca urmatorul document

http://www.bis.gov.uk/assets/nmo/docs/services/type-approval/nel-report-temp-comp-on-lf.pdf

M-am documentat pentru a-mi repara greseala :)
Last edited by Gabilsson on 29 Jan 2013, 00:41, edited 1 time in total.
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Re: Donatie la Petrom, sau altceva?

Postby Gabilsson » 29 Jan 2013, 00:40

Cateva citate din concluziile acelui document:

The oil industry generally has to live with a rather inexact system as regards
measurements. The accuracy of measurements are limited because of the differing types
of equipment used and the inherent inaccuracy of dip-sticks and the temperature
adjustments required with fluctuating ambient temperatures

Metering of deliveries with temperature adjustment to ambient temperature will cause
added expense and operational complexity which is not justified by the benefits. The
consumer will inevitably pay or the hard-pressed industry will have its margins eroded
further - there is no alternative. Again there is no justification for this. The motorist is
already burdened with excessive excise duty (and VAT) payments and unnecessary
expense for the supply industry will only add to costs.

There is no justification for a change to current practices except for more temperature
information to be made available to petrol retail buyers. Metering with temperature adjustment would
require pressurized or pumped systems which would be costly and the consumer would
pay.
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Re: Donatie la Petrom, sau altceva?

Postby Dansb » 29 Jan 2013, 07:06

Teoria e corecta, practica ne omoara.
Tancurile (rezervoarele) din benzinarii sunt ingropate la 2,5 - 3m in pamant si merg pana la 5-6 m (depinde de volum), unde temperatura este constanta (probabil in jur de 8-10 grade).
In cele cateva zeci de secunde, cat alimentezi, nu este suficient timp pentru a se comprima/dilata, indiferent de temperatura exterioara.
Motorina face foarte multa spuma la alimentare, venind cu presiune, si trebuie sa ai rabdare daca vrei sa faci un plin adevarat. Si benzina face spuma, dar mai putina si dispare mai repede decat la motorina. Sincer, nu cred ca se fura asa, intotdeauna se verifica/confirma cantitatea bagata cu cea indicata de CID/SID (Opel/Saab). Poate diferente de 0,2-0,3 l la un plin, dar puteau proveni si din reglarea BC-ului.
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