Experimental study of flame spread on conveyor belts in a small-scale tunnel.
Authors
Yuan L; Litton CD
Source
Fire and Materials 2007 -10th International Conference, January 29-31, 2007, San Francisco, California. London: Interscience Communications, 2007 Feb; :1-10
Link
NIOSHTIC No.
20031658
Abstract
This paper presents experimental results for conveyor belt flame spread from tests conducted in a small-scale tunnel. The purpose of this study is to investigate the effects of belt type, ventilation velocity, belt surface-to-roof distance and ignition source power on the flame spread properties. The tunnel used was 4.9 m long by 0.46 m square with the ventilation velocity ranging from 0.7 to 3.2 m/s. The ignition source was an impinged methane jet burner with heat output ranging from 7 to 21 kW. The belts tested included non-fire resistant rubber belts, fire-resistant rubber belts, fire-resistant neoprene belt and fire resistant PVC belt with belt samples measuring 0.23 m wide by 2.5 m long. Experimental results show that with a ventilation velocity of 1.02 m/s all conveyor belts could be ignited, and that with sufficient ignition source power, flames spread the full length of the belt sample. The data showed a coupling effect of the ventilation air velocity and the belt surface-to-roof distance on the flame spread rate. For instance, flames could not spread with a ventilation velocity higher than 1.52 m/s and a surface-to-roof distance of 0.22 m. The use of the measured CO/CO2 ratio as an indicator of combustion stoichiometry is also discussed.
National Institute for Occupational Safety and Health, Pittsburgh Research Laboratory, 626 Cochrans Mill Road, P.O. Box 18070, Pittsburgh, PA 15236, USA
Publication Date
20070201
Document Type
Conference/Symposia Proceedings
Fiscal Year
2007
NIOSH Division
PRL
Source Name
Fire and Materials 2007 -10th International Conference, January 29-31, 2007, San Francisco, California.
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