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Flashcards in 14. Foam equipment and systems Deck (21)
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1

__ Foams are the most common foams in use

Mechanical

2

Class __ Foams are designed solely for use on hydrocarbon fuels and are not effective on polar solvent products regardless of the concentration that is applied

B

3

How foam works

Separating
cooling
suppressing or smothering

4

Class A foam

The shelflife of properly stored foam solution can be as long as 20 years making it an economical choice to purchase in bulk quantities.

0.1-1%
Most stable at 1%

5

$$$

The ___ ___ for foam also plays a major role in the effectiveness of the product.

Drain time

6

$$$

A __ duration drain time provides the most rapid wetting, while a __ drain time provides an insulating layer for a longer period of time.

Short

longer

7

When ready for immediate use during emergency operations, similar type concentration such as a ___ and ___ may be mixed together immediately before application.

AFFF

fluroprotien

8

Class B

The concentration of ___ is normally 1 or 3%, while 3 or 6% is used for ___, based on the manufacturers recommendation.

Hydrocarbon fuels

Polar solvents

9

___ ___ foam generally has good heat stability and burn back resistance.

Regular protein foam

10

Notes

Fog nozzles are not in acceptable choice for delivery of fluroprotien foams or polar solvents

Durable or gelling agents

Fluoroprotein foam may be made of alcohol resistant with the addition of ammonia salts suspended in organic solvents making it effective for approximately 15 minutes

Batch mixing is only useful with class A and AFFF. Class A only good for 24 hrs.

11

A simple and common method of foam proportion involves the use of a __ foam proportioner.

Portable

12

$$$

The in-line eductor uses the __ principal to draft foam concentrate into the water stream.

Venturi

13

Back pressure

The pressure at the discharge side of the enductor must not exceed __% of the enductor inlet pressure.

70%

14

The foam concentrate eductor should be no more than __ feet above the liquid surface of the foam concentrate.

6 ft

15

Master stream nozzle is deployed wheb flows of excess of __ GPM is required.

350 gpm

16

$$$

Type of foam eductor that is used to supply self educting master stream nozzles may be located at distances up to 3000 feet from the nozzle.

Jet ratio controller

17

Are one of the most common types of installed proportioners used in modern fire apparatus.

Around the pump proportioner

18

Proportioner has the ability to allow foam discharge from some outlets, and plain water from others simultaneously.

Bypass type balance pressure proportioner

19

The only nozzles that should be used with protein and fluroprotien concentrates.

Air aspirating foam nozzle

20

Four ways of applying foam

Direct application
roll on
bank down
rain down

21

Most common method of application for above ground storage tanks

Rain down