000			02147nab a2200205 4500
005			20260520001047.0
008			260224s2011 xxu
245	0	0	_aSmall-scale test protocol for firefighting foams DEF(AUST)5706 _bEffect of bubble size distribution and expansion ratio
260			_a _b _cene. 2011
270			_a19/07/2011 ; 19/07/2011
300			_a14 p. ; 149-162
520			_aTranscripción del resumen del autor. The experimental program described in this paper sought to assess the suitability of the small scale DEF(AUST)5706 standard for measuring the suppression and burnback performance of Class B foams on pool fires. DEF(AUST)5706 is an Australian Defence standard mandatory for use by the Australian Navy, Army and Air Force. The test protocol required the measurement of the 3/4 control, extinguishment and 1/3 burnback times for a circular pan of aviation gasoline (AVGAS 100/130), 0.28 m2 in surface area. The test program involved compressed-air foams (CAF) and aspirated foams of two expansion ratios, and employed two AFFF formulations: a 6% telomer concentrate and, to obtain base-line measurements, 3% PFOS FC-600 concentrate which was manufactured by the 3 M company prior to the PFOS phase out. At lower expansion (7:1), the aspirated and compressed-air foams demonstrated similar fire control performance, whilst more expanded (9:1) CAF was generally more efficient at extinguishing, but less efficient in controlling the fire. CAF formed a better seal over the fuel surface and at the hot pan walls, and these foams performed noticeably better than aspirated foam against fuel re-ignition. The paper links these observations with the underlying distributions of bubble sizes, which were measured and fitted to modified Rosin/Rammler cumulative volume distribution functions. We propose that a modified version of DEF(AUST)5706 be adopted as a universal small-scale test protocol.
581			_a1
773	0		_tFire Technology _g47
942			_cARTICULO
100	1		_aLaundess, Ashlea J. _950854
100	1		_aRayson, Mark S. _950855
100	1		_aKennedy, Eric M. _938581
999			_c184025 _d184025