CH10: Fires Flashcards
Fire requires….to start. Thus only one needs to be…
oxygen, heat, and fuel…eliminated
Role of a Key Fire Person
- Evacuate the Building, and direct people to the right escape route
- Check control panels, where and why the alarm went off, and try to locate the fire
- Call for help using Emergency numbers giving information about other chemicals stored and injuries, providing information for even false alarms
- Be able to provide first aid
- Secure clear access for emergency services and provide information
- Write up a report and notify safety committees
Class A Fires
*Fuel is paper, books, clothes, and ordinary combustibles
*Extinguish with: Water and Film-Forming Foam Fire Extinguishers
Class B Fires
- Flammables and Combustible liquids
*Extinguish with: Carbon Dioxide, Dry chemical, and Film-Forming Fire Extinguishers
Class C (Class B for US) Fires
*Fuel is flammable gases
*Try to extinguish with: Carbon dioxide and dry chemical extinguishers
* Emergency Services always required
Class D Fires
*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
Class E/ K/ C Fires
*Fuel - Electrical fires up to 1000 watts
* Extinguish with Carbon dioxide or dry chemical. Never water-based
Class F / K Fires
*Fuel is cooking oil or fat
*Extinguish with dry chemical, baking soda, or fire blanket
How do peroxides begin to develop?
When the seal is broken and the inert gas is replaced with the atmosphere
How long should compounds known to develop explosive peroxides be stored for?
Don’t store for more than 3 months, nor 3 months after seal is broken
How long should compounds known to develop explosive peroxides in their pure forms be stored for?
Don’t store more than 3 - 12 months after breaking seal.
How long should vinyl monomers known to degrade to explosive and combustibles be stored for?
Dont store for more than 12 months, unless stored with proper stabilizers/inhibitors
General tips for dealing with fires:
*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
How to prevent organic solvent, combustible metal, flammable, and explosives from catching fire? (Preventatives)
*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
How to prevent solvents, acids, bases, and oxidizers from catching fire? (Preventatives)
Any metals or water reactive chemical should be stored in designated areas
Explain how it work, and what it’s best used for…Carbon dioxide extinguishers
*able to push oxygen away, very cold, and is good with instruments as it’s a gas
*Best for solvents, flammables, and electrical fires
Explain how it work, and what it’s best used for…Water based extinguishers and hoses
*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
Explain how it work, and what it’s best used for…Film-Forming Foam Extinguishers
*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
Explain how it work, and what it’s best used for…Film-Forming Flouroprotein Foam Extinguisher
*Use the foam to seal oof the fuel to oxygen
*Best used for Class B and a range of organic solvents
Explain how it work, and what it’s best used for…Dry chemical extinguishers
*Suffocates the fire
*Best for Class A, B, and C. however, it is corrosive and thus it not appropriate in lab
Explain how it work, and what it’s best used for…Foam Extinguishers
*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
Explain how it work, and what it’s best used for…Wet Chem Fire Extinguisher
*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
Explain how it work, and what it’s best used for…Fire Blanket!
*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.
Explain how it work, and what it’s best used for…Sand!
*Suffocates the fire from oxygen
*Best with Reactive metals (Class D)
