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Portable around the pump proportioners can turn any pumper into a foam truck.
What are the solution flows they offer?
50-4500gpm @ 1% ratio
50-1500gpm @ 3% ratio
750gpm @ 6% ratio
Installed in-line eductors are most commonly used to proportion what kind of foam concentrates?
Class B Foam
What is the most common type of built in proportioner installed in mobile fire apparatus today?
Around the pump proportioner
On an around the pump proportioner- when the valve is open what is the small amount of water directed through the bypass piping after being discharged from the pump?
Around the pump proportioners are available in what flow ranges?
As little as 60gpm to as high as 2,000gpm
On an around the pump proportioner if inlet water supply is greater than _____, the foam concentrate will not enter the pump intake.
Versions are capable of handling intake pressure up to?
Inlet water supply > 10psi
versions are capable of handling intake pressures up to 40psi
What is the normal oxygen content of air?
Other trace elements 1%
What is a BTU?
The amount of heat needed to raise the temp of 1lb of water 1° F
What is a Calorie?
The amount of heat needed to raise the time of 1gram of water 1°C
1 calorie = how many Joules?
1BTU = how many Joules?
1055J or 1.055J
What temp does a combustible liquid release flammable vapors?
What about a flammable liquid?
At what oxygen concentration does the intensity of a fire begin to decrease?
What concentration doesn't support combustion?
<18% fire begins to decrease
<15% O2 doesn't support combustion
At what temp does a Flashover occur?
What is the Ignition temp of CO?
900°-1,200° for flashover
CO ignition - 1,128°
Heat release is measured in what?
- BTU per second
What is responsible for the spread of fire?
What types of foam concentrate are used with Air-aspirating foam nozzles?
may also be used with Class A foams
What is the flow rate of a Manual Flow Monitor?
200gpm - 2,000gpm
What is the flow rate of an Auto-Oscillating Foam Monitor?
Flows up to 2,000gpm
What is the flow rate of a Remote Control Foam Monitor?
Flows up to 3,000gpm
Most structural and wildland fire attacks using CAFS are done with an airflow rate of?
.5 to 1cfm
In a CAFS very dry finished foam at flows up to 100gpm is accomplished with how much air flow?