TB Purple K dry chem extinguisher

Question 1

Purple K dry chemical extinguishers have been issued to various units of the department. Purple K is a potassium bicarbonate base dry chemical. While other dry chemical extinguishers are effective, Purple K has demonstrated a superior extinguishing capability in combating ________ fires.
Fill in the blank

Answer 1

1
Methanol
Methanol’s use as an alternate fuel for gasoline and diesel powered vehicles and equipment throughout the city will inevitably lead to fire situations at which the extinguishment of this fuel will be required. Purple K is also effective on gasoline, diesel and compressed gas fires.

Question 2

FEATURES
-Purple K Dry Chemical Capacity of 27 lbs.
- Discharge Range 19’ - 20’.
- Discharge Time - __ seconds.
- Coverage approximately - 30 square feet.
- Temperature restrictions - extinguisher can be used between minus 40 and 120 degrees.
Fill in the blank

Answer 2

2.2

11

Question 3

Direct stream at base of flames using what type of motion?

Answer 3

2.3.3
Direct stream at base of flames using a side to side motion. In order to achieve even distribution, and to obtain best results the nozzle should be held with the member’s strongest hand. Hold the extinguisher upright.

Question 4

Expended extinguishers can be exchanged by attaching an RT-2 and forwarding to who?

Answer 4

2.3.4

Technical Services for replacement.

Question 5

When shall the Purple K extinguisher be checked?

Answer 5

2.4

The extinguisher shall be checked at the beginning of each tour and thoroughly examined once a month.

Question 6

Three-hundred pound dry chemical wheeled units are used extensively in industrial complexes throughout the city of New York. Familiarization with these units is important. All Units will carry Purple K as an extinguishing agent.
True or False

Answer 6

3
False
Note that these units are not necessarily Purple K, but may be dry chemical with a sodium bicarbonate base. Sodium bicarbonate is not as effective on methanol fires as Purple K. It will be necessary to determine, before use, what type of dry chemical the wheeled unit contains.

Question 7

OPERATION
- Stretch entire amount of hose from unit, approximately ___ ft.
- Charge unit by opening valve on nitrogen cylinder.
- Open nozzle until flow of dry chemical is noted.
- Close nozzle and move to the point of operation.
Fill in the blank

Answer 7

3.2.1-3.2.4
100 Ft.
Note: Hose, whether on wheeled units or on reels found on dry chemical trucks should be stretched before charging to eliminate the binding of the hose to the reel. Pressurization of the hose will cause the hose to expand and possibly bind on the reel.

Question 8

When applying dry chem/Purple K to Flammable gas/Liquid gas fires, approach the fire from the upwind side holding the nozzle at a __ degree angle to the ground. Stop walking at a point approximately __ to __ feet from the front edge of the fire area. Direct the stream of dry chemical __ inches ahead of the flame edge.
Fill in the blanks

Answer 8

4. Application Techniques
   45 degree
   10 to 12 feet
   6 inches

Question 9

Can Dry chemical be used in conjunction with water from a handline?

Answer 9

4.9 Note:
The simultaneous use of water and dry chemical combine to make a highly effective fire fighting tool. While the water acts as a coolant and heat shield, the dry chemical provides the means for rapid extinguishment.

Question 10

ADD 1 Purple K Unit
Purple K-dry chemical agent is a very successful extinguishing agent for use on all types of aircraft fuels. It should always be used in conjunction with what other extinguishing agent when used on aircraft fuels?

Answer 10

1.2.1

Fluoroprotein foam

Question 11

ADD 1 Purple K Unit

When starting the attack how many feet back from the fire should members be?

Answer 11

1.3.3

Start attack about 20-30 feet from the fire, wind at your back, and use a side to side sweeping motion.

Question 12

ADD 1 Purple K Unit
Operations at large, complex or difficult to access sites may require that several extinguishers be used. When using more than one extinguisher, the angle of attack of these extinguishers should be no more than __ degrees to avoid exposing members.

Answer 12

1.3.4

90 degrees

Question 13

ADD 1 Purple K Unit

When dealing with a 3 dimensional fire always control which fire 1st, the ground fire or start at the top?

Answer 13

1.3.7 & 1.3.8
Always control ground fires first. If not, the ground fire may re-ignite a 3-D spill.
Continue discharging the chemical agent well after all fire is extinguished. NEVER TURN YOUR BACK ON THE FIRE.

Question 14

ADD 1 Purple K Unit
Two electric hose reels containing 100’ of 1” hose, with special nozzles for expelling the product are installed. It is possible to attach 2 lengths together but discharge pressure may be reduced. The Purple K truck mounted system will last less then __ minutes.
Fill in the blank

Answer 14

1.3.9

2