Fire/Arson Investigations : Fire/Arson Investigations
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Re: Watching Paint Dry: Hypothesis Testing of Ignition Scenarios Involving Spontaneous Heating
Posted by: dcarpenter (IP Logged)
Date: January 21, 2022 10:27AM
The separated oil will not be sufficient to answer your question.
The liquid or solid oil will most likely not self-heat without the aid of a porous substrate that can absorb the oil. The substrate acts as a wick and increases the surface area of the oil to increase the mass loss rate of the vapors. Kerosene lamps are a good example of this phenomenon.
In your case, you would need to test the oil on the residual chips.Your sample should be representative of the particle size distribution of the residual chips. The sample should also be representative of the mass ratio of oil to chip. The packing density would also need to be determined for any testing. Controlled oven testing at three (3) cube sizes with the associated critical ambient temperatures required for self-heating to thermal runaway is necessary to develop an ignition model for this material.
Douglas J. Carpenter, MScFPE, CFEI, PE, FSFPE
Vice President & Principal Engineer
Combustion Science & Engineering, Inc.
8940 Old Annapolis Road, Suite L
Columbia, MD 21045
(410) 884-3266
(410) 884-3267 (fax)
www.csefire.com
The liquid or solid oil will most likely not self-heat without the aid of a porous substrate that can absorb the oil. The substrate acts as a wick and increases the surface area of the oil to increase the mass loss rate of the vapors. Kerosene lamps are a good example of this phenomenon.
In your case, you would need to test the oil on the residual chips.Your sample should be representative of the particle size distribution of the residual chips. The sample should also be representative of the mass ratio of oil to chip. The packing density would also need to be determined for any testing. Controlled oven testing at three (3) cube sizes with the associated critical ambient temperatures required for self-heating to thermal runaway is necessary to develop an ignition model for this material.
Douglas J. Carpenter, MScFPE, CFEI, PE, FSFPE
Vice President & Principal Engineer
Combustion Science & Engineering, Inc.
8940 Old Annapolis Road, Suite L
Columbia, MD 21045
(410) 884-3266
(410) 884-3267 (fax)
www.csefire.com
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