A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Explosion venting is often the lowest cost solution among available protection options. On the other hand, the burnt and unburnt material ejected from a vent opening can create a serious threat to personnel or to vulnerable equipment located near the vent. In situations where such a threat exists, installing a vent duct to redirect the discharge to a safe location is a common solution. Through various factors discussed in the paper, the presence of the vent duct increases the resistance to vent discharge. Several public guidelines such as NFPA 68, prEN 14491, and VDI 3673 provide differing methodologies to account for this effect. Besides, currently available public methodologies are limited to idealized straight vent ducts only. This paper reviews available test data and the contemporary understanding of the phenomena involved in deflagration venting through ducts. Then, an improved calculation method is proposed. The new method eliminates the problems identified with the published methods. It can also handle real life vent duct installations which may have obstructions such as bends, elbows, bird screens or rain covers. Vent duct effects are accounted for using simple algebraic correlations. Improved correction factors for vent cover deployment pressure (Pstat), and enclosure aspect ratio (L/D) are also developed and presented in this paper. These new correlations are also applicable to simple vents without ducts. The practical use of the correlations are illustrated by solving two sample benchmark problems. Depending on the details of the venting application, the new correlations may require smaller or larger vent areas as substantiated by available test data. Most importantly, the new correlations expand substantially the number of practical applications that can be solved with explosion venting.
Explosion venting is often the lowest cost solution among available protection options. On the other hand, the burnt and unburnt material ejected from a vent opening can create a serious threat to personnel or to vulnerable equipment located near the vent. In situations where such a threat exists, installing a vent duct to redirect the discharge to a safe location is a common solution. Through various factors discussed in the paper, the presence of the vent duct increases the resistance to vent discharge. Several public guidelines such as NFPA 68, prEN 14491, and VDI 3673 provide differing methodologies to account for this effect. Besides, currently available public methodologies are limited to idealized straight vent ducts only. This paper reviews available test data and the contemporary understanding of the phenomena involved in deflagration venting through ducts. Then, an improved calculation method is proposed. The new method eliminates the problems identified with the published methods. It can also handle real life vent duct installations which may have obstructions such as bends, elbows, bird screens or rain covers. Vent duct effects are accounted for using simple algebraic correlations. Improved correction factors for vent cover deployment pressure (Pstat), and enclosure aspect ratio (L/D) are also developed and presented in this paper. These new correlations are also applicable to simple vents without ducts. The practical use of the correlations are illustrated by solving two sample benchmark problems. Depending on the details of the venting application, the new correlations may require smaller or larger vent areas as substantiated by available test data. Most importantly, the new correlations expand substantially the number of practical applications that can be solved with explosion venting.
Dust explosion venting through ducts
Entlüftung von Staubexplosionen durch Kanäle
Ural, Erdem A. (author)
2005
35 Seiten, 13 Bilder, 1 Tabelle, 15 Quellen
Conference paper
English
Dust Explosion Venting through Ducts
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