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Effectiveness of an enhanced deluge system to protect LPG tanks and sensitivity to blocked nozzles and delayed deluge initiation
Previous work has shown that directed water deluge systems designed to just give the current recommended minimum rate of ca. 10 dm3 m-2 min-1 provide inadequate protection of liquefied petroleum gas (LPG) storage vessels against flashing-liquid propane or butane jet fires. However, the results suggested that an enhanced design could be effective. This paper describes the work carried out by the Health and Safety Laboratory (HSL) to determine a deluge design for protecting against flashing-liquid propane jet fires. A suitable design was found for at least protection against ca. 2 kg s-1 flashing propane jet fires and this design was used to investigate the effect of blocked nozzles and delayed deluge initiation. The results suggest that a surface water flow of at least 11 dm3 per m2 and minute is required to protect against a propane jet fire, corresponding to 40 dm3 for the application in question. Hazardous temperatures occur if at least two adjactant nozzles are blocked and the situation is overcome if the water returns within 100 seconds.
Effectiveness of an enhanced deluge system to protect LPG tanks and sensitivity to blocked nozzles and delayed deluge initiation
Previous work has shown that directed water deluge systems designed to just give the current recommended minimum rate of ca. 10 dm3 m-2 min-1 provide inadequate protection of liquefied petroleum gas (LPG) storage vessels against flashing-liquid propane or butane jet fires. However, the results suggested that an enhanced design could be effective. This paper describes the work carried out by the Health and Safety Laboratory (HSL) to determine a deluge design for protecting against flashing-liquid propane jet fires. A suitable design was found for at least protection against ca. 2 kg s-1 flashing propane jet fires and this design was used to investigate the effect of blocked nozzles and delayed deluge initiation. The results suggest that a surface water flow of at least 11 dm3 per m2 and minute is required to protect against a propane jet fire, corresponding to 40 dm3 for the application in question. Hazardous temperatures occur if at least two adjactant nozzles are blocked and the situation is overcome if the water returns within 100 seconds.
Effectiveness of an enhanced deluge system to protect LPG tanks and sensitivity to blocked nozzles and delayed deluge initiation
Leistungsfähigkeit einer verbesserten Flutungsanlage zum Schutz von Flüssiggastanks und Störbarkeit durch blockierte Düsen und verzögerten Sprühbeginn
Roberts, T.A. (author)
Journal of Loss Prevention in the Process Industries ; 17 ; 151-158
2004
8 Seiten, 7 Bilder, 5 Tabellen, 9 Quellen
Article (Journal)
English
DELUGE - Vielha protects with deluge
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