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Mining Publication: A 20-Liter Furnace Test Method to Determine the Combustion Gas Toxicity of Conveyor Belts
Keywords: Carbon monoxide Conveyors Fires Gas measurement instruments Hydrogen 
 Nitrous oxides
Original creation date: January 1996
Authors: MI DeRosa
Report of Investigations - January 1996
Download PDF Document (0.21 MB)
NIOSHTIC2 Number: 00233937
Pittsburgh, PA: U.S. Department of Energy, Report of Investigations 9626. NTIS NO. PB96-202619, 1996 Jan; :1-10
The U.S. Department of Energy Pittsburgh Research Center conducted experiments with mine conveyor belt samples in a 20-L furnace and in a laboratory fire tunnel to measure and compare the major toxic gas concentrations evolved during the combustion of the materials. The toxic gas concentrations, measured simultaneously through a multiport sampling device and treated as yield values, included hydrogen chloride (HO), hydrogen cyanide (HeN), oxides of nitrogen (NOx treated as NO2), and carbon monoxide (CO). The data obtained from the two experimental systems were in good agreement. Correlations were developed for the toxic gas yields as a function of the percentage of chlorine (for HO gas), nitrogen (for HCN and NO2 gases), and carbon (for CO gas) contained in the original materials. The toxic gas yields were also used to calculate a toxicity index (TI) parameter to assess the potential gas toxicity of belt materials during a fire. Furthermore, the TI and the mass loss burning rate values were used to calculate a toxicity hazard (TH) parameter to estimate the toxic gas hazard produced by a burning belt in a ventilated system. Results show that polyvinyl chloride (PVC) belts released higher HCl concentrations because of the higher chlorine content; styrene-butadiene rubber (SBR) belts released higher CO, HCN, and NO2 concentrations because of the higher carbon and nitrogen contents. The TI's, however, were greater for the PVC belts due primarily to the higher levels of HCl produced. The fire tunnel data indicate that the SBR belts can burn with higher mass loss rates than the PVC belts, resulting in a potentially higher toxic hazard (higher TH values) even though their TI values were lower than those of the PVC belts.
Image of publication A 20-Liter Furnace Test Method to Determine the Combustion Gas Toxicity of Conveyor BeltsReport of Investigations - January 1996
Download PDF Document (0.21 MB)
NIOSHTIC2 Number: 00233937
Pittsburgh, PA: U.S. Department of Energy, Report of Investigations 9626. NTIS NO. PB96-202619, 1996 Jan; :1-10
See Also
CFD Modeling of Fire Spread Along Combustibles in a Mine Entry
Dangers of Toxic Fumes from Blasting
Experimental Study of Flame Spread on Conveyor Belts in a Small-scale Tunnel
Factors Affecting ANFO Fumes Production
Flammability of Wider Conveyor Belts Using Large-scale Fire Tests
Impact of Air Velocity on the Detection of Fires in Conveyor Belt Haulageways
Rapid (Grab) Sampling During Full-scale Explosions - Microscopic and Analytical Evaluation
Smoke, Carbon Monoxide, and Hydrogen Chloride Production from the Pyrolysis of Conveyor Belting and Brattice Cloth
Technology News 497 - "You Are My Sunshine": A New Video Release From NIOSH on the Sunshine Mine Fire
Technology News 549 - MFIRE 3.0 - NIOSH Brings MFIRE into 21st Century
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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