Foam Systems Simplified

Question 1

Jet Ratio controller

Answer 1

3,000 ft away
Self-educting master stream
50ft elevation

Question 2

bypass proportioner

Answer 2

reduces friction loss across eductor

Question 3

Type of foam used with in-line eductors

Answer 3

Class B (class A requires very low concentrations)

Question 4

Around the pump proportioner

Answer 4

Most common
bypass line from discharge back to intake uses eductor at foam tank
flows only foam or water not both

Question 5

Used on ARFF
PTO driven
Most accurate
Separate foam pump
runs in tandem with the fire pump
capable of water and foam simultaneously

Answer 5

bypass-type balanced pressure proportioner

Question 6

Generally operated off electrical system
Class A and Class B (not AR foam)
Any flow rate
Nozzles above or below pump
High energy foam capable
Pump can only flow foam or water

Answer 6

Variable-Flow Variable-Rate Direct injection

Question 7

Pumped/Demand system
Venturi proportioning device
monitors pump flow to match foam
No recirculation of product
Ready to pump requiring no flushing
Can flow water and Foam from different lines

Answer 7

Variable-Flow Demand-Type Balance Pressure system

Question 8

When it can flow water or foam simultaneously it is

Answer 8

Balanced system