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

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Issued: September 30, 2008 7. TASK 4 – EVALUATE DISCHARGE CHARACTERISTICS OF NOZZLES Because the effectiveness of special fire extinguishing agents can be affected by the discharge characteristics of the delivery equipment, the agent characteristics were evaluated using the nozzle and pattern employed in Task 6 and 7. The discharge characteristics were determined in general accordance with UL 162 including expansion ratio for the two different application methods and 6 agents tested. The quarter drain times for the agents were not determined due to very low foam quality. Additionally the range was investigated for each application method and agent tested. 7.1 Expansion Ratio The expansion ratio can be thought of as the ratio of final foam volume to original foam solution volume before adding air. The different agents were discharged through the same nozzle with the two different discharge patterns. The wide spray was discharged at 15 gpm and the straight stream was discharged at 22 gpm. The discharge patterns impacted a UL 162 foam slider board and the resulting foam was collected and measured. Refer to Figure 12 and Figure 13 for the expansion ratios collected. Figure 12 – Wide Spray Pattern Expansion Ratio of Agents Page 21 of 55
Issued: September 30, 2008 7.2 Discharge Range Figure 13 – Straight Stream Pattern Expansion Ratio of Agents The range of the application stream coming from the test nozzle was measured. The method incorporated setting the nozzle on a test stand, verifying the nozzle was positioned horizontally to the test lab floor and discharging the nozzle using both the wide spray and straight stream patterns with each of the 6 agents tested in Tasks 6 and 7. The range was determined subjectively by reviewing the leading and trailing edges of the impact pattern on the test lab floor, and choosing the average as the point to be measured from the nozzle. The wide spray was discharged at 15 gpm and the straight stream was discharged at 22 gpm. Refer to Figure 14 and Figure 15 for the ranges measured. Page 22 of 55
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Page 73 and 74: Appendix C - Fire Propagation Photo
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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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