Tactical Scenarios


• A ladder company was assigned to the HMRT to assist with air moni- toring. Air monitoring equipment was assigned to each hand line crew to ensure that foaming operations were conducted within safe operating limits.


PROBLEM: Foam a gasoline spill created by a pipeline rupture cover- ing an area 100 feet by 100 feet. The surface area that needs to be cov- ered with foam solution is 10,000 square feet. The fire department will be using a Class B—3% x 3% Aqueous Film Forming Foam (AFFF).


CALCULATIONS:


1. What is required for vapor protection or fire extinguishment? Gasoline—hydrocarbon liquid. The 3% AFFF can be used for extin- guishment using 1¾-inch hoselines with foam nozzles.


2. Determine the surface area involved. Area = (Length) (Width) Area = (100 ft) (100 ft) Area = 10,000 ft(2)


3. Determine the appropriate foam application rate. The gasoline surface can be covered using a 0.10 gpm/ ft 2 AFFF


Surface Area Foam application = area x recommended application rate Foam application = (10,000 ft2) (0.10 ft2) Foam application = 1,000 gpm


4. Determine the duration of foam application.


Gasoline has a flash point of –45ºF. Therefore, the recommended duration is 15 minutes for the contained surface area. Surface Area of Confined Gasoline


Required Foam Solution = Foam application x Duration Required Foam Solution = (1,000 gpm) (15 minutes) Required Foam Solution = 15,000 gallons of foam solution


5. Determine the total quantity of foam concentrate required. The fire department is using 3% foam concentrate


Required amount of foam concentrate = required foam solution x 3% Required amount foam concentrate = (15,000 gallons) (3%) Required amount of foam concentrate = 450 gallons Required amount of water = 14,550 gallons


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