Foam Test Some initial analysis

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Presentation transcript:

Foam Test Some initial analysis Ian Crotty 2 March 2015

Initial Tests in new Foam Bunker Tests done with Santo K 4S ( old stock from P5) Sthamex Expandol MeteorP Plus Foam Generator Kidde HEFG 35 and Smoke/heat source

Pressure versus flow rate The calc. nozzle and the Kidde spec agree but the measurements do not indicating an optimistic flow meter or low “P” reading.

Foam Production versus inlet Pressure The two specified operating points from Kidde are far above the test data. Results for 1 nozzle. From a SCUM HG 15 there is a maximium in the Foam rate

Expansion ration & Flow rate Expansion ratio is far below spec. Smoke makes thing worse.

Conductivity to define proportion

Mixture ratio off set The real proportion is established from electrical conductivity of the mixed solution.

Emulsifier corrections for different Foam Agents The method used has only been verified for the Sthamex.

Smoke & Temperature test measurements Temperatures and air flow speeds were recorded. Temperatures in the smoke generator Time FB2m Horiz BoxFG [hh:mm:ss] [degC] 17:42:?? 180 148 68 17:45:?? 316 255 105 17:46:05 17:46:10 281 207 97 17:46:31 234 163 34 17:46:52 246 160 17:48:18 239 145 33 17:49:07 202 132 31 17:49:32 197 133 32 FB2m = 2m above the fire box base Horiz = position in the horizontal portion just before the FG BoxFG = position in the shrowd infron of the FG FG = Foam Generator Data from; Noemi & Zoltan Smoke box entry to Foam Generator Side

Conclusions The time must be taken that all parameters are/ have been taken before moving on to the next run. Data points have been lost and are far from credible as essential values are not recorded. Carry out smaller scale tests to understand the parameter space with better foam height evaluation, easier turn round and less time and cost. The flow rate given by the Fire brigade flow meter appears optimistic. So far we have not seen any sign of a maxima in the foam rate. This should be a goal of the tests. Smoke and or heat appears to reduce significantly the foam production. But we have no reliable values. These values should be understood. The method of mixing (educator) is not reliable across different Foam Agents and perhaps not across the flow rates we were using.

How it started June 2014

Fire Brigade eductor and flow meter

Bunker location on CERN site Has been modified since this aerial image was taken