Accession Number : AD0882649

Title :   The Destruction of High-Expansion Fire-Fighting Foam by the Components of Fuel Pyrolysis and Combustion.

Descriptive Note : Final rept.,

Corporate Author : STANFORD RESEARCH INST MENLO PARK CA

Personal Author(s) : Alvares, Norman J. ; Lipska, Anne E. ; Alger, Raymond S.

Report Date : 24 FEB 1971

Pagination or Media Count : 109

Abstract : Combustion and pyrolysis products in the air supply of high-expansion foam generators generally inhibit foam production. While this phenomenon is well documented, the mechanism is not known. The purpose of this research was to identify both the foam-breaking constituents and the mechanisms. Chemical constituents were identified both through literature search and measurements. Foam-breaking parameters were measured by the quality and quantity of foam generated when combustion products were introduced into a laboratory-scale foam generator, from the foamability of foam solution-containing products, by surface tension measurements with product-contaminated foam solutions, and by product gas diffusion through bubble walls. Half of the compounds tested detrimentally affect the production and/or stability of Hi-X foam. In an environment of high smoke concentration it is possible, at least on laboratory scale, to remove enough foam-breaking chemicals by water-spray scrubbing techniques so that foam formation will resume. (Author)

Descriptors :   (*FIRE EXTINGUISHERS, FOAM), (*FOAM, INHIBITION), COMBUSTION PRODUCTS, DEGRADATION, COMBUSTION, CHEMICAL REACTIONS, SMOKE, PYROLYSIS, CELLULOSE.

Subject Categories : Safety Engineering
      Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE