COURSE: PROTECTIVE ENVELOPE AND FOAM
SESSION REFERENCE: 3-1
TOPIC: HANDLING HOSELINES AND FOAM APPLICATION - LECTURE/PRACTICAL
TIME REQUIRED: 3 HOURS
MATERIALS: Overhead Projector, MFRI OHT's, Hose and appliances, Foam and foam equipment
REFERENCES: IFSTA Essentials, 3rd ed.
The student will be utilizing basic concepts for hose and appliances usage. Practice in these areas will ensure speedy and efficient use on the fireground.
OBJECTIVE (SPO): 3-1 T-PEAF-3-1-1
The student will be able to demonstrate utilizing hoselines and foam applicators, from memory, without assistance, to an accuracy of 70% and the instructor's satisfaction.
Handling Hoselines/Foam Application
* Types of Fuel
* Determining Application Rate
* Assembling a Foam Fire Stream
* Tactical Considerations for Foam Operations
* Nozzle Usage
* Advancing Line
* Assemble Foam Equipment
* Method of Applying Foam
SESSION 3-1 HANDLING HOSELINES AND FOAM APPLICATION LECTURE/PRACTICAL
SPO 3-1 The student will be able to demonstrate utilizing hoselines and foam applicators, from memory, without assistance, to an accuracy of 70% and the instructor's satisfaction.
3-1-1 Identify the differences between hydrocarbon and polar solvent fuels and the types of foam concentrate for each.
3-1-2 Define the basic principles of foam generation and extinguishment.
3-1-3 Determine the minimum application rate for fire extinguishment when given fuel surface size and type, and type of foam concentration used.
3-1-4 Identify how to assemble the components of a fire foam stream system utilizing an in-line foam proportioner.
3-1-5 Describe tactical considerations for foam operations.
3-1-6 Demonstrate how to open, close, and adjust stream patterns and flow settings for various size nozzles.
3-1-7 Demonstrate advancing a hoseline.
3-1-8 Demonstrate the assembly and the operation of a foam fire stream arrangement.
3-1-9 Demonstrate the method for applying a foam stream. (NFPA 472,3-4.4.1)
I. Types of Fuels (3-1-1)
1. Petroleum based
2. Lighter than water
3. Vapors suppressed by foam as it floats on fuel surface
B. Polar solvent
1. Has attraction for water (like that of positive and negative magnetic poles)
2. Alcohol resistant formulations of foam necessary for extinguishment
II. Principles (3-1-2)
1. Smothering - preventing air and flammable vapors from combining
2. Separating - intervening between the fuel and the fire
3. Cooling - lowering the temperature of fuel and adjacent surfaces
4. Suppressing - preventing release of flammable vapors
a. Foam concentrate - raw liquid in container
1) 5 gallon pail
2) 55 gallon drum
3) Apparatus storage tank
b. Foam eductor uses the venturi principle to draw foam concentrate into the water steam
c. Foam proportioner – injects correct amount of concentrate into water steam to make foam
d. Foam solution - mixture of concentrate and water discharge from proportioner through the
e. Finished foam - completed product after solution reaches nozzle and is aerated
2. Necessary elements
a. Foam concentration
b. Water (90-99% solution)
III. Determining Application Rate (3-1-3)
A. Concentrates must be used only at specific percentages for which they are designed to be proportioned (1, 3, 6 percent)
B. Percentage concentrations
1. Foams for hydrocarbon fires - 1-6 percent concentrations
2. Foams for polar solvent fires - 6-10 percent concentrations
3. Medium and high expansion foams - 1,2, or 3 percent concentrations
4. FFFP or AFFF small air/solution ratio - 5:1 to 10:1
C. Application rates