CH10: Fires

Question 1

Fire requires….to start. Thus only one needs to be…

Answer 1

oxygen, heat, and fuel…eliminated

Question 2

Role of a Key Fire Person

Answer 2

1. Evacuate the Building, and direct people to the right escape route
2. Check control panels, where and why the alarm went off, and try to locate the fire
3. Call for help using Emergency numbers giving information about other chemicals stored and injuries, providing information for even false alarms
4. Be able to provide first aid
5. Secure clear access for emergency services and provide information
6. Write up a report and notify safety committees

Question 3

Class A Fires

Answer 3

*Fuel is paper, books, clothes, and ordinary combustibles
*Extinguish with: Water and Film-Forming Foam Fire Extinguishers

Question 4

Class B Fires

Answer 4

• Flammables and Combustible liquids
  *Extinguish with: Carbon Dioxide, Dry chemical, and Film-Forming Fire Extinguishers

Question 5

Class C (Class B for US) Fires

Answer 5

*Fuel is flammable gases
*Try to extinguish with: Carbon dioxide and dry chemical extinguishers
* Emergency Services always required

Question 6

Class D Fires

Answer 6

*Fuel is combustible Metals
*Extinguish with: Class D specific fire extinguishers or fine sand
*Never use water-based or Foam forming.
*Always keep this specific extinguisher near work sights

Question 7

Class E/ K/ C Fires

Answer 7

*Fuel - Electrical fires up to 1000 watts
* Extinguish with Carbon dioxide or dry chemical. Never water-based

Question 8

Class F / K Fires

Answer 8

*Fuel is cooking oil or fat
*Extinguish with dry chemical, baking soda, or fire blanket

Question 9

How do peroxides begin to develop?

Answer 9

When the seal is broken and the inert gas is replaced with the atmosphere

Question 10

How long should compounds known to develop explosive peroxides be stored for?

Answer 10

Don’t store for more than 3 months, nor 3 months after seal is broken

Question 11

How long should compounds known to develop explosive peroxides in their pure forms be stored for?

Answer 11

Don’t store more than 3 - 12 months after breaking seal.

Question 12

How long should vinyl monomers known to degrade to explosive and combustibles be stored for?

Answer 12

Dont store for more than 12 months, unless stored with proper stabilizers/inhibitors

Question 13

General tips for dealing with fires:

Answer 13

*Close all windows and doors, and increase the heat int neighboring rooms if possible
*Make sure everyone evacuates to the designated fire assembly points
*If you can, try to stop any work with flammables or chemicals in neighboring buildings
*Make sure any locked rooms have keys available, the building layout is available showing fire extinguishers, flammables, and other chemicals

Question 14

How to prevent organic solvent, combustible metal, flammable, and explosives from catching fire? (Preventatives)

Answer 14

*Compounds with flash point below 38C should be stored in specialized refrigerators, and never over 10 L
*Compound flash points above 38C should be stored in a 300-500m2 and no more than 20L

Question 15

How to prevent solvents, acids, bases, and oxidizers from catching fire? (Preventatives)

Answer 15

Any metals or water reactive chemical should be stored in designated areas

Question 16

Explain how it work, and what it’s best used for…Carbon dioxide extinguishers

Answer 16

*able to push oxygen away, very cold, and is good with instruments as it’s a gas
*Best for solvents, flammables, and electrical fires

Question 17

Explain how it work, and what it’s best used for…Water based extinguishers and hoses

Answer 17

*Water cools down area and produces lots of gas that to push away oxygen.
*Located near doorways and hallways.
*Works well to drench something, better for Class A fires

Question 18

Explain how it work, and what it’s best used for…Film-Forming Foam Extinguishers

Answer 18

*Creates a film between oxygen and fuel, thus suffocating it while the water cools it down and produces a gas to push away oxygen
*Best for Class A, B, and F/K fires

Question 19

Explain how it work, and what it’s best used for…Film-Forming Flouroprotein Foam Extinguisher

Answer 19

*Use the foam to seal oof the fuel to oxygen
*Best used for Class B and a range of organic solvents

Question 20

Explain how it work, and what it’s best used for…Dry chemical extinguishers

Answer 20

*Suffocates the fire
*Best for Class A, B, and C. however, it is corrosive and thus it not appropriate in lab

Question 21

Explain how it work, and what it’s best used for…Foam Extinguishers

Answer 21

*Alternate to water and dry chemical extinguishers, and stored with flammable liquids.
*best for combustibles, flammable oils, organic solvents, and any other Class A, B, and F/k fires

Question 22

Explain how it work, and what it’s best used for…Wet Chem Fire Extinguisher

Answer 22

*Sprays fine mist of potassium salts that foam a soapy layer over fuel and produce (toxic) gases
*Best for hot oil and fat - Class A and F/K

Question 23

Explain how it work, and what it’s best used for…Fire Blanket!

Answer 23

*Hold the tops of the blanket and cover your hands with the corners. Blankets suffocate the fire.
*Best for any fire as long as your quick enough. You can spray extinguishers under the blanket to help.

Question 24

Explain how it work, and what it’s best used for…Sand!

Answer 24

*Suffocates the fire from oxygen
*Best with Reactive metals (Class D)

Question 25

Explain how it work, and what it’s best used for…Fire alarms!

Answer 25

*Break the glass and push the button if an alarm is not sound in time.

Question 26

When are you the key person?

Answer 26

When designated, or if you are the first person on the scene.