In this tutorial, we will explore the foremost common classifications of fire extinguishers.
The first, and most common type of extinguisher is used for a Class A fire. These are fires fueled by ordinary combustible materials such as paper, wood, carbon, most plastics. The Class A fire extinguisher uses the water to smother the fire.
Class B fires are fueled by flammable liquids such as gasoline, kerosene, grease, and oil. Remember this classification extinguisher – think “B” for Boil, or oil. Class B extinguishers typically use liquid foam agent to smother the fire. You never want to use water on a Class B fire, as the water can cause the flammable liquids to spread like we accidentally drip water on a frying pan, and the grease pops, and in boiling liquid into the air.
Class C fires are fueled by electrical current traveling to wires, circuits, and outlets. Class C extinguishers most commonly use a dry chemical powder to smother the fire. In more sensitive environments such as a recording studio, a Class C extinguisher may use a halon gas that does not leave a residue. These are often referred to as clean agents. You would also never want to use water on a Class C fire for obvious reasons.
Most household extinguishers are a combination of Class A, B, and C ratings. These extinguishers can be used on ordinary combustible fires, liquid fires, and electrical fires.
The last of the four common classifications of fire is the Class D fire. The Class D fires fueled by combustible metals such as magnesium, potassium, and sodium. Class D fire extinguishers are used exclusively for Class D fires, and use materials such as sand, and dry chemical powders to smother the fire.
Special thanks to RVTCDEN who shared this video on Youtube.
It first happened on Monday September 5, 2011. A Nepal Airlines flight was cancelled at Tribhuvan International Airport, Kathmandu.
Do you guess why? The flight attendants spotted a stowaway mouse onboard their B-757 bound to Bangkok! The small rodent fled from the galley’s pantry, and rushed from a box of drinks to the back of the cabin although the 113 passengers did not notice the tiny stowaway.
The mouse was finally caught thanks to a glue trap. The jetliner was grounded for more than eleven hours.
Then, the same Boeing 757 – this time bound to Kathmandu – was grounded at Hong Kong International Airport on Tuesday September 6, in the evening.
The reason: the pilots spotted a mouse in the cockpit just before the airplane departure. The aircraft has not been cleared to take off because this mouse was trapped but then escaped, and would still be on the loose. The 84 passengers were rerouted on a Dragonair aircraft.
As far as flight safety is concerned, an aircraft cannot take off with a mouse moving freely onboard as it can gnaw the wiring, and therefore represents a potentiel danger.
It can only be caught or trapped. However, NAC (Nepal Airlines Corporation) could not poison any mouse for a small animal can damage an airplane even if it is dead somewhere, and particularly if in contact with a vital part of the plane.
Special thanks to Mr Hermas, and LadyEleanorA who buzzed this piece of news.