Performance of Special Extinguishment Agents for ... - UL.com

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Issued: September 30, 2008 6. Task 3 – NFPA 18, Class A Fire Extinguishment Tests – Wood Crib Tests with Listed 2A Rated Hand Held Water Extinguisher 6.1 General Class A fire tests were conducted to determine baseline performance of the extinguishing agents incorporating a standardized fire test method. Using the data obtained, six of the eight agents were chosen to continue study. 6.2 Test Method The investigation began with eight (8) different extinguishing agents. They were a combination of wetting agents, Class A foams and an unrated agent for fire fighting service. One (1) percent concentrations of the extinguishing agents were prepared in a hand held, 2-1/2 gallon water extinguisher. UL 711, 3A wood cribs were used for this portion of the investigation. The crib was ignited with commercial grade heptane in a pan underneath the crib. When the mass loss from the burning wood crib reached 45 percent of the initial mass, a fire fighter attacked the crib fire from 3 of the 4 sides, the top and bottom of the crib in accordance with the test method. Duplicate testing was conducted for the eight agents mentioned above. 6.3 Test Results The result of the test series indicated no significant difference in the heat release rate reduction versus time curve for the eight agents tested as can be seen in Figure 10 and Figure 11. It should be noted that the earlier reduction for Agent B in the charts was due to an early reduction in mass prompting the earlier attack. Convective heat release rate is a measure of the hot gases being produced in a fire. Total heat release rate is a combination of the convective heat release rate and the radiative heat release rate which is associated with the electromagnetic emission from the flame – the light being given off. See section 8.2.2 for a more detailed description of the two heat release rate terms. These terms will be used throughout the remainder of this document. Page 19 of 55
Issued: September 30, 2008 2,500 Heat Release Rate (kW) 2,000 1,500 1,000 500 Agent E Agent E Agent G Agent G Agent A Agent A Agent H Agent H Agent B Agent B Agent D Agent D Agent C Agent C 0 0 200 400 600 800 1000 1200 1400 Time (sec) Figure 10 – Convective Heat Release Rate of Hand Held Extinguisher Test Series 3,000 Heat Release Rate (kW) 2,500 2,000 1,500 1,000 Agent E Agent E Agent G Agent G Agent A Agent A Agent H Agent H Agent B Agent B Agent D Agent D Agent C Agent C 500 0 0 200 400 600 800 1000 1200 1400 Time (sec) Figure 11 – Total Chemical Heat Release Rate of Hand Held Extinguisher Test Series Page 20 of 55
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Appendix D - Fire Fighting Tactics
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Appendix D - Fire Fighting Tactics
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Appendix E - Smoke Obscuration Data
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Appendix F - Oxygen Concentration D
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Appendix G - Wood Crib - Agent Test
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