| Zugriffsnummer | 17545 |
| Dokumenttyp | Konferenzartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Flash-point or lower explosion point - which one to choose for explosion-prevention? |
| Autor(in); Institution |
Brandes, Elisabeth; 3.4, Grundlagen des Explosionsschutzes, PTB-Braunschweig
Mitu, Maria; University of Bucharest, Department of Physical Chemistry, Bucharest, ROMANIA
Pawel, Dieter; 3.4, Grundlagen des Explosionsschutzes, PTB-Braunschweig
|
| Quelle/Jahr | Proceedings of the European Combustion Meeting, ECM 2005, Louvain-la-Neuve, Belgium, April 3 - 6, 2005:(2005), 5 S. |
| Availability | [CD-ROM] ; file name: 197_Pawel.pdf |
| Herausgeber(in) |
Dias, Véronique
|
| Verlag | Louvain-la-Neuve: CSTR-UCL |
| Konferenzangaben | ECM 2005, Louvain-la-Neuve, 3-6, April, 2005, Belgium |
| Freie Schlagworte | flashpoint ; lower explosion point ; explosion prevention |
| Zusammenfassung | Since second part of 19th century the flash point (FP) is used for classification of flammable liquids. The advantage of the flash point is, that it is well established all over the world and that it can be measured by well known methods, which are in general standardized. But it is a fact, that explosions may occur in saturated mixtures of the vapour of flammable liquids in air still at temperatures some Kelvin below the FP. That minimum temperature (below the FP) at which an explosion may occur is called the lower explosion point (LEP). The poster explains the physico-chemical differences of the FP, the LEP and the lower explosion limit (LEL). It shows the differences between the methods for measuring the FP and a method to measure the LEP, which is used by PTB-Laboratory in Germany. Some experimental results for the FP, the LEP and the LEL are presented for pure flammable liquids, for aequous solutions of some alcohols, and for mixtures of flammable liquids, including some mixtures containing halogenated liquids. The differences between the FP and the LEP vary from about 3 Kelvin for some pure hydrocarbons up to 15 K in the case of some mixtures. By this an industrial process even running a few Kelvin below the FP may operate in an explosive vapour/air-atmosphere. Only operating at temperatures below the LEP gives sufficient safety. Some halogenated hydrocarbons are able to form explosive vapour/air-mixtures, but they have no FP according to the standards. That means they have a LEL and a LEP, so an explosion hazard is given though they have no FP. The poster will show results of current investigations, running in PTB. |
