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Sizing of Explosion Pressure Relief using the Efflux Function

  • Determination of deflagration venting requirements in chemical/process plants is usually carried out using well established standards employing an empirically based formula. However, this formula is shown to have severe shortcomings, especially in the range of low KG-values, where either negative or inconceivably large venting areas can be predicted. Due to these shortcomings a method has been developed using the efflux function for gases as a basis to predict the mass flow through a vent opening in a vessel during an internal explosion. The simulated rise in pressure due to the internal explosion is quantitatively determined from the KG-value, with the mass flow through the vent opening in the vessel resulting from the pressure difference between the vessel and its surroundings. This enables the maximum overpressure as a function of the pressure relief surface area to be predicted. The method takes into account the temperature of the efflux gases and turbulence enhancement broughtDetermination of deflagration venting requirements in chemical/process plants is usually carried out using well established standards employing an empirically based formula. However, this formula is shown to have severe shortcomings, especially in the range of low KG-values, where either negative or inconceivably large venting areas can be predicted. Due to these shortcomings a method has been developed using the efflux function for gases as a basis to predict the mass flow through a vent opening in a vessel during an internal explosion. The simulated rise in pressure due to the internal explosion is quantitatively determined from the KG-value, with the mass flow through the vent opening in the vessel resulting from the pressure difference between the vessel and its surroundings. This enables the maximum overpressure as a function of the pressure relief surface area to be predicted. The method takes into account the temperature of the efflux gases and turbulence enhancement brought about by the venting process. In the following paper explosion pressure relief experiments are described and the results from these experiments are compared to predictions from the efflux method. It is shown that by adjusting the assumed turbulence which evolves during the venting process, the reduced explosion pressure can be reasonably well reproduced.zeige mehrzeige weniger

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Metadaten
Autor*innen:R. Blanchard, Kai Holtappels, Martin Kluge, H.-P. Schildberg, Robert Zeps
Persönliche Herausgeber*innen:E. de Rademacher, P. Schmelzer
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Chemical Engineering Transactions
Jahr der Erstveröffentlichung:2016
Verlag:AIDIC Servizi S.r.l
Verlagsort:Milano, Italy
Jahrgang/Band:48
Erste Seite:487
Letzte Seite:492
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurbau
Freie Schlagwörter:Deflagration; Efflux; Explosion; Pressure relief; Venting
Veranstaltung:15th International Symposium on Loss Prevention and Safety Promotion in the Process Industries and accompanying exhibition
Veranstaltungsort:Freiburg, Germany
Beginndatum der Veranstaltung:05.06.2016
Enddatum der Veranstaltung:08.06.2016
DOI:10.3303/CET1648082
ISSN:2283-9216
ISBN:978-88-95608-39-6
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:25.10.2016
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:25.10.2016
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