What are the type of fire extinguishers commonly used and briefly, explain each one?
Multipurpose dry chemical, carbon dioxide, halon, wet chemical or foam, pressurized water are the commonly used fire extinguishers.
Multipurpose dry chemical / class “A”, “B”, or “C” fires.2.5-20lb. dry chemical (ammonium phosphate) pressurized to 10.5-18 bar by CO2 gas (8-25 seconds discharge time). Has pressure gauge to allow visual capacity check.5-20ft maximum effective range. Extinguisher by smothering burning materials
Smothering – Cut off oxygen / close the ventilation using fire extinguisher
Starving – Remove the fuel / remove the material going to burn
Cooling – Reduce the heat / use water
Carbon Dioxide – Class “B” or “C” fires 2.5-100lb. of CO2 gas at 150-200 psi (8-30seconds discharge time).
Has NO pressure gauge-capacity verified by weight 3-8 ft. maximum effective range.
Extinguisher by smothering burning materials, Effectiveness decreases as temperature of burning material increases.
Halon – Class “A”,”B”, or “C” fires (smaller sizes ineffective against class “A”). 9-17 lb. Halon 1211 (pressurized liquid) releases as vapor (8-18 seconds discharge time). Has pressure gauge to allow visual capacity check 9-16 ft. maximum effective range. Works best in confined area – ideal for electronics fire due to lack of residue. Extinguishers by smothering burning materials, Fumes toxic if inhaled, Halon is ozone depleting chemical – production halted in Jan ’94.
Wet Chemical or Foam – Class “A”, “B” fires 1.5gal of stored pressure PRX wet chemical extinguishing agent (40 sec. discharge time) 10-12 ft. maximum effective range. On Class “K” fires, don’t use until after fixed extinguishing system has activated, Extinguishes by cooling and forming foam blanket to prevent reigniting.
What is S
95) What is the formula for incident rate? Number of Record able injuries X 200,000
Number of employees Hour Worked
200,000 is the equivalent of 100 full time employees working for 40 hours per week or 50 weeks per year (OSHA guidelines)