14. Foam equipment and systems

Question 1

__ Foams are the most common foams in use

Answer 1

Mechanical

Question 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

Answer 2

B

Question 3

How foam works

Answer 3

Separating
cooling
suppressing or smothering

Question 4

Class A foam

Answer 4

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%

Question 5

$$$

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

Answer 5

Drain time

Question 6

$$$

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

Answer 6

Short

longer

Question 7

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

Answer 7

AFFF

fluroprotien

Question 8

Class B

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

Answer 8

Hydrocarbon fuels

Polar solvents

Question 9

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

Answer 9

Regular protein foam

Question 10

Notes

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

Durable or gelling agents

Answer 10

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.

Question 11

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

Answer 11

Portable

Question 12

$$$

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

Answer 12

Venturi

Question 13

Back pressure

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

Answer 13

70%

Question 14

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

Answer 14

6 ft

Question 15

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

Answer 15

350 gpm

Question 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.

Answer 16

Jet ratio controller

Question 17

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

Answer 17

Around the pump proportioner

Question 18

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

Answer 18

Bypass type balance pressure proportioner

Question 19

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

Answer 19

Air aspirating foam nozzle

Question 20

Four ways of applying foam

Answer 20

Direct application
roll on
bank down
rain down

Question 21

Most common method of application for above ground storage tanks

Answer 21

Rain down