A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
In the U.S., the National Fire Protection Assn.'s NFPA-30 code is generally followed to determine the heat load that would result from a fire. The method is prescriptive in the sence that it binds the user to a definitive method, thus avoiding subjectibility. However, for a number of cases, the prescriptive method falls short and either underestimates or overestimates the potential heat load of the process fluids under consideration. This shortcoming is likely to be corrected in the revision of NFPA-30 in 2006. In the meantime, its consequences should be heeded diligently and adapted where necessary. Essentially, NFPA-30 underestimates heat fluxes for hydrocarbon fuels of C6 or ligher. The presentation first outlines the prescriptive method using NFPA-30 and than suggests modifications to it for cases where complete fuel-characteristic data are not available for fundamental calculations. Finally, the fundamental method and its appropriate use are defined. The presented examples concern gage accuracy of vent reduction factors for fuels more combustible than ethanol, vent sizing per NFPA-30 and via fundamentals as well as flame hight and temperature.
In the U.S., the National Fire Protection Assn.'s NFPA-30 code is generally followed to determine the heat load that would result from a fire. The method is prescriptive in the sence that it binds the user to a definitive method, thus avoiding subjectibility. However, for a number of cases, the prescriptive method falls short and either underestimates or overestimates the potential heat load of the process fluids under consideration. This shortcoming is likely to be corrected in the revision of NFPA-30 in 2006. In the meantime, its consequences should be heeded diligently and adapted where necessary. Essentially, NFPA-30 underestimates heat fluxes for hydrocarbon fuels of C6 or ligher. The presentation first outlines the prescriptive method using NFPA-30 and than suggests modifications to it for cases where complete fuel-characteristic data are not available for fundamental calculations. Finally, the fundamental method and its appropriate use are defined. The presented examples concern gage accuracy of vent reduction factors for fuels more combustible than ethanol, vent sizing per NFPA-30 and via fundamentals as well as flame hight and temperature.
In case of fire, break assumptions. Emergency relief system design
Das, D.K. (author)
Chemical Engineering, New York ; 111 ; 34-40
2004
7 Seiten, 1 Bild, 6 Tabellen, 20 Quellen
Article (Journal)
English
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