Foam

Question 1

What are the 4 low expansion techniques

Answer 1

Gentle application
Raindown
Rolling On
Off wall (indirect)

Question 2

What is the name of the high expansion equipment

Answer 2

The Angus Turbex MKII

Question 3

What are the three classifications of foam?

Answer 3

Low expansion
Medium expansion
High expansion

Question 4

What are the ratios of:
Low expansion foam
Medium expansion foam
High expansion foam

Answer 4

Low expansion foam- between 5:1 and 15:1
Medium expansion foam- between 20:1 and 200:1
High expansion foam- between 200:1 and 2000:1, usually not more than 1200:1

Question 5

What is added to an RB101 to use foam

Answer 5

An aspirator attachment

Question 6

What affects its effectiveness

Answer 6

The condition of the concentrate
The correct mixture of concentrate
Good maintenance of equipment
Correct pump pressure

Question 7

When the bypass is closed on the The Angus Turbex MKII, what bar pressure is delivered

Answer 7

7 bar

Question 8

What bar pressure should the ground monitor be set to

Answer 8

7 bar

Question 9

What flow rate should the RB101 be set to when using foam

Answer 9

400lpm

Question 10

What pressure should the RB101 be set to when using foam

Answer 10

6 bar

Question 11

How many litres per minute are delivered when using the ground monitor

Answer 11

950 with the foam nozzle

Question 12

What are the three variables when producing foam

Answer 12

1-the volume of air mixed with the volume of solution
2- the quantity of foam concentrate added
3- the size of bubbles (not low pressure)

Question 13

What 7 health and safety considerations are to be made when using foam

Answer 13

1- Never apply water to burning liquids
2- The branch must be aimed away from the fire until there is a constant supply of foam
3- Apply foam to the furthest point of burning liquid
4-Ensure there is enough foam to complete a sealing blanket
5- surrounding risks must be cooled with covering jets
6- Don’t apply water on top of a foam blanket
7- Dont walk om, or drag equipment through a blanket

Question 14

What are the 7 hazards when working with high expamsion foam?

Answer 14

1- claustrophobic
2- disorientation
3- severeley affected light penetration
4- Limited audibility (danger, acme, instructions)
5- mini backdrafts from pockets of oxygen
6- reduced transmission of heat making fire more difficult to find
7- difficult to spot surrounding damege and signs of building collapse