Fire and Electrical Safety

1. Fire and Electrical Safety A PowerPoint Presentation keyed to Chapter 11 of Materials for Teaching Agricultural Safety in the College Classroom by Carol J. Lehtola, PhD, and Charles M. Brown Book and more presentations in this series are available on the National Ag Safety Database, www.nasdonline.org

2. Objectives To identify and understand hazards related to fire and electrical safety Fire and Electrical Safety Slide 11.1

3. Fire Triangle Heat source Fuel Oxygen Fire and Electrical Safety Slide 11.2

4. Absorption of Heat Principle ... The more finely divided a substance is, the more rapidly it absorbs heat Ex., grain dust explosion, mist putting out a fire DeBruce Grain Elevator Explosion: https://www.osha.gov/SLTC/grainhandling/geeit/ Fire and Electrical Safety Slide 11.3

5. Vapor Density Principle Use an index of 1 for the density of air Vapors with a density <1 will be dispersed in the air Vapors with a density >1 will be found along the ground IMPORTANT TO KNOW WHERE THE VAPORS ARE Fire and Electrical Safety Slide 11.4

6. Flashpoint Principle The lowest temperature at which a flammable liquid gives off vapors and can ignite Fire and Electrical Safety Slide 11.5

7. Flashover Rapid initiation of combustion of objects near a fire because of extreme heat. Can occur within 3 minutes from when the fire started — not from the time it was discovered Fire and Electrical Safety Slide 11.6

8. Classes of Fire A (ash) Wood, paper, etc. B (barrel) Oil, gasoline C (current) Electrical D Metals K (kitchen) Cooking oils Fire and Electrical Safety Slide 11.7

9. Types of Extinguishers A B C D K ABC Remember the one extinguisher rule! Fire and Electrical Safety Slide 11.8

10. One Extinguisher Rule “If it takes more than one RUN!” * *Ryan Burley, AOM Safety Class 2007 Fire and Electrical Safety Slide 11.9

11. P.A.S.S. Technique for extinguishing a fire: Pull the pin Aim at the base of the fire Squeeze the trigger Spray at the base Fire and Electrical Safety Slide 11.10

12. Heat Sources Electric motors Trouble-light bulbs/heat lamps Portable heaters Electrical wiring Fire and Electrical Safety Slide 11.11

13. Risk Heat Sources (cont’d) Mechanical friction Bearings Lightning Chemical processes (spontaneous combustion) Cigarettes Static electricity Welding Fire and Electrical Safety Slide 11.12

14. Sources of Fuel Chaff/debris Vapors Grease Flammable liquids Surrounding field/brush/forest Fire and Electrical Safety Slide 11.13

15. Examples Welding on fuel tank Kids with cattle prod LRB on tractor exhaust Friction spark — underground storage tank Welding on wheel — tire exploded Wet haystack covered with tarp Pinched fuel lines Fire and Electrical Safety Slide 11.14

16. Planning Questions What to do with animals How are areas of the farm or site accessed What and where are nearby water sources Chemical and hazardous materials storage Fire department numbers for other farms or sites Fire and Electrical Safety Slide 11.15

17. Other Points Shut off electricity to abandoned buildings Keep maps of underground wires and gas lines with the property papers Prevention is key — especially in rural areas where response time is longer Fire and Electrical Safety Slide 11.16