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

Issued: September 30, 2008
11.4 Water Only Application Testing
Using the general methodology of section 11.1, a water only application until the point of 25
percent of the heat release rate at time of application was conducted. The heat release rate
regrowth was considered to be too quick after removing the nozzle.
A second test was conducted, this time terminating the attack at 10 percent of the heat release
rate at time of water application. In this test, the wood crib was suppressed to the point where
minimal regrowth occurred.
A third test was conducted, averaging the test termination points from tests 1 and 2. This time,
the attack termination occurred at 17 percent. The regrowth of the still burning wood crib was
thought to be slow and acceptable for further comparison testing. This test was conducted two
additional times with water only for repeatability sake.
The convective heat release rate versus time data is presented in Figure 39.
The control point of 17 percent of the initial heat release rate at time of attack was chosen for the
remainder of the test series with agent application.
Figure 39 – Convective Heat Release Rate Curve for Wood Crib Water Only Testing
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