A Substitute Liquid for AFFF (Aqueous Film Forming Foam) Concentrate for Checking Proportioners.

摘要

The high cost of Aqueous Film Forming Foam (AFFF) concentrate makes it expensive to conduct the routine testing of shipboard High Capacity Fog Foam station proportioners and has created the desire for a lower cost substitute material. The selection of an appropriate liquid to simulate the performance of an AFFF concentrate in a proportioning system is based on matching the viscosity characteristics for pumping and the index of refraction characteristics for analysis. Mixtures of glycerin and water were found capable of reproducing these properties of all existing AFFF concentrates when used in strengths of 40to 87% glycerin. The extra logistics and manipulations required to use a simulated liquid should be considered in making a decision on its use. (Author)