PRT 110: Lesson 7 Fire and Explosion

Lesson Plan

Learning Objectives

  • Describe the principles of fire prevention, protection, and control.
  • Review the chemistry of fire.
  • Describe the fire classification system.
  • Evaluate the different types of fire extinguishers.
  • Analyze the different fire stages.
  • Identify the various types of fire-fighting equipment.
  • Respond to a fire emergency.
  • Describe flammable and explosive materials.
  • Contrast the Monsanto chemical plant Texas City explosion 1947 with the Union Carbide Bhopal, India vapor release 1984.
  • Evaluate the impact of the Phillips, Houston TX. vapor release and explosion (1989) and the ARCO, Houston TX. explosion (1990) on the development of the process safety management standard.

Read and Watch

Read chapter 7 of the textbook. Watch the following videos:

Extinguisher Use – How to use a Fire Extinguisher

 

Fire Safety – Fire Extinguisher Types and Use

 

Bleve Demo

 

Activities

  1. Complete the homework associated with the reading.
  2. Complete the activity.
  3. Complete the activity quiz.
  4. Complete the chapter quiz

Activity Quiz

AMIT 129: Lesson 9 Mine Fires and Fire Fighting

Objectives

Upon completion of this lesson students should be able to:

  • Identify different types of fire.
  • Identify firefighting equipment.
  • Demonstrate use of a fire extinguisher.

Reading & Lecture

The Four Types of Fires

Fire Type A icon fire sign A Wood bases, cloth, paper, rubber, certain plastics
Fire Type B icon fire sign B Flammable liquids, gases, greases, petroleum products
Class C Fire icon fire sign C Electrical equipment
Class D Fire icon fire sign D Combustible metals

CLASS A Fires

These fires occur with ordinary combustible material such as wood, pyritic ore, coal, cloth, paper or oil rags. These materials leave ashes after the fire, so you can associate Class A fires with Ashes. Class A fires are usually fought with water, which cools and dampens the fuel. Also, some special dry chemicals are used to quickly extinguish the flame and prevent reflash.

CLASS B Fires

These fires are burning flammable liquids, such as gasoline, greases, hydraulic oil, diesel fuel, and lubricating oils. The fire occurs in the fumes over the surface of flammable and combustible liquids. Typical Class B fires occur with spills or pools of liquids found near rubber-tired vehicles, drills, bulk fuel storage areas, maintenance shops, and lube operations. Class B fires involve liquids that Boil. These fires are fought with dry chemicals, foam, vaporizing liquids, carbon dioxide and water fog.

CLASS C Fires

These are electrical fires. Typical electric fires include electric motors (as used in fans), batteries, battery chargers, transformers, and circuit breakers. You can associate Class C fires with the electric Current. Class C fires are fought with non-conducting agents, such as dry chemicals, carbon dioxide, and vaporizing liquids. If the current is still on do not fight the fire with water or foam because these conduct electricity, and thereby pose another hazard to fire fighters. Once electricity is cut off the fire can be treated as a Class A or B fire, thereby permitting use of water.

CLASS D Fires

These fires involve combustible metals such as magnesium, titanium, zirconium, and sodium. These fires require special extinguishing agents and fire fighting techniques. Normal extinguishing agents should not be used to fight Class D fires because they could make the fire worse. This is because they may have a hazardous chemical reaction with the burning metal.

Video: Mine Fire Training

Video: Coal Mine Fire Training

When a fire is discovered, your immediate reaction in fighting the fire is crucial. Mere seconds are available for preventing the spread of the fire. For this reason you should know where the nearest fire extinguisher is located, and whether it is permissible for this type of fire. If you are uncertain about the contents of the extinguisher, read the main instructions on the body of the canister.

For most portable fire extinguishers, you usually have to stand no more than 8 feet from the fire. Direct the stream at the base of the flame, not higher up at the smoke. A 30-pound extinguisher will normally last 18 to 25 seconds. Do not turn your back to a fire. When the fire is extinguished, back away from it and watch for any flare up.

Fire Fighting Equipment and Methods

The mine’s fire prevention and fire fighting plan is designed to reduce the opportunity for a fire starting, and should one occur, to limit the extent of its destruction. The damage resulting from a fire can be minimized through adequate fire protection. Fire protection consists of monitoring and controlling fire hazards, available fire fighting equipment, especially portable fire extinguishers, and the personnel who are trained to use the equipment effectively in the event of a fire. The following are some good fire prevention techniques.

Basics of Fire

  1. The necessary ingredients of a fire are fuel, oxygen, and heat. Fire fighting calls for removal of at least one of these ingredients. The fuel can be moved to a safer location. Oxygen can be sealed off from the fire, thereby suffocating it. Or the fire’s heat can be reduced by cooling the fuel.
  2. Fires have been classified into four types based on the kind of fuel involved in the fire. These different kinds of fires are fought in different ways. In fact, using the wrong kind of chemical to extinguish the fire can even spread the fire further.

Video: Types of Fire Extinguishers and Their Uses

 

Video: Fire Extinguisher Types and Uses

 

Fire Extinguisher Types

Extinguisher Types of Fire
Color Type Solids (wood, paper, cloth, etc) Flammable Liquids Flammable Gasses Electrical Equipment Cooking Oil & Fats Special Notes
Types of Fire Extinguishers -Water Water check-mark No No No No Dangerous if used on “liquid fires” or live electricity.
TypesOfFireExtinguishers-foam Foam check-mark check-mark No No No Not practical for home use
 Type of Fire Extinguishers - powder Dry Powder check-mark check-mark check-mark check-mark No  Safe use up to 1000v.
Types Of Fire Extinguishers - CO2 Carbon Dioxide (CO2) No check-mark No check-mark check-mark Safe on high and low voltages.

 

 

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