TB 95 Flow Mix Model 500-Class A foam

Question 1

The easiest way to make Class “A” Foam is through the addition of ____ to a 500 gallon apparatus water tank. This yields a ___ foam/water ratio.

Answer 1

2-1/2 gallons of concentrate / 0.5 %

Question 2

The tank mixing method has been a source of some controversy due to the cleansing action of the detergent within the tank and fire pump. Additionally, the tank must be____ after the use of the foam to preclude contaminating subsequent water.

Answer 2

purged

Question 3

At this time tank mixing is ___ an approved method and shall ___ be used.

Answer 3

not

Question 4

Aspirating nozzles
A disadvantage with this nozzle is that more of the energy from the water is used to ___ to create foam and less energy is available to project the foam resulting in reduced discharge distances.

Answer 4

educt air

Question 5

Aspirating nozzles

Foam concentrate is usually mixed at ___ by volume and is expanded at a ratio of up to 20:1.

Answer 5

0.3 to 1.0%

Question 6

The Model 500 design incorporates the use of a ___ that supplies water pressure around a bladder-type tank containing the foam concentrate

Answer 6

Differential Pressure Valve

Question 7

Refilling requires approximately ___ and primary water flow is unaffected during the procedure.

Answer 7

two minutes

Question 8

The Flow Mix Model 500, ___ proportioner works on the principle of line pressure being exerted on a bladder filled with Class “A” Foam.

Answer 8

five gallon

Question 9

DO NOT EXCEED maximum operating pressure of ___.

Answer 9

450 psi.

Question 10

The Flow Mix Model 500 will accurately proportion up to ___ concentrate into the line at flow rates up to 300 gpm.

Answer 10

1 %

Question 11

Flow rates between ___ gpm will cause proportioning accuracy to drop off slightly.

Answer 11

300 and 400

Question 12

A significant decrease in proportioning accuracy will result when flow rates above ____ are utilized.

Answer 12

400 gpm

Question 13

The Flow Mix Model 500 can be used with any handline or combination of lines up to ___.

Answer 13

400 gpm

Question 14

At flow rates above ___ the Metering Valve must be set to a higher percent setting than is actually desired to attain adequate proportioning.

Answer 14

400 gpm

Question 15

Refill Position
When approximately ___ have been pumped, the water from the discharge tube will stop flowing and there will be increased resistance in the hand pump.

Answer 15

five gallons

Question 16

An initial setting of ___ foam is recommended. This setting will help reduce water damage and increase the length of time before a refill of the unit becomes necessary.

Answer 16

.2 %

Question 17

Class “A” Foam may be used as an effective overhaul tool, if applied in a judicious manner. The recommended initial setting is ___.

Answer 17

0.3 to 0.5 %.

Question 18

The 95 gpm air aspirating nozzle will produce a good quality finished foam that will adhere well to ____.

Answer 18

vertical surfaces.

Question 19

Exposure Protection:

The recommended beginning mixture is ___ on the Metering valve.

Answer 19

0.3

Question 20

In general, foam will be visible for approximately ___ in hot weather, up to___ in cool weather. As long as foam is visible, the treated fuel will remain wet.

Answer 20

one-hour / four-hours

Question 21

Brush
When foam is applied in this manner it will provide a layer of insulation from heat. The recommended initial setting is ___.

Answer 21

0.5 to 0.6 %.

Question 22

When treating Duff, the goal is to penetrate the fuel layer so fire is not carried by untreated fuels below the foam cover or wet top layer. A straight stream nozzle setting with a mixing action achieves the best results. The recommended initial setting is ___.

Answer 22

0.1 to 0.2 %.

Question 23

Dumpsters and Rubbish
Finished foam applied with the 95 gpm air aspirating nozzle will provide a foam with body but still wet enough to penetrate. The recommended setting is ___.

Answer 23

0.3 to 0.4%.

Question 24

Finished foam will cool, wet and seal piles of tires. It will provide a quick knockdown with reduced tendency to reflash. The recommended initial setting is ___.

Answer 24

0.3%.

Question 25

Class “A” Foam can be effective on auto fires using standard spray nozzles. It will greatly reduce overhaul; however, it can create a slippery road surface. The recommended initial setting is___.

Answer 25

0.3 %.