A Class C fire requires an agent that can break apart the elements that feed a fire: oxygen, heat, and fuel. Class C fire extinguisher which contains mono ammonium phosphate, potassium bicarbonate, or potassium chloride, all of which are suitable for putting out Class C fires.Continue Reading

A Wet riser is used to supply water within multiple levels or compartments of a building for fire fighting purposes.Continue Reading

The formula to find GPM is 60 divided by the seconds it takes to fill a one-gallon container (GPM = 60 / seconds)Continue Reading

NFPA 291 provides guidance on fire flow tests and marking of hydrants in order to determine and indicate the relatively available fire service water supply from hydrants and to identify possible deficiencies which could be corrected to ensure adequate fire flows as needed.Continue Reading

The firewater Ringmain is a header network of pipes that transfers the water from the pumps to the fire.Continue Reading

Average Daily Demand (ADD) is the total volume of water delivered to the system over a year divided by 365 days.Continue Reading

Q = 29.84(cd)(d^2)*(sqrt(p)) 29.84 is a constant derived from physical laws relating to water velocity, pressure, and conversion factors. In short, this number keeps the answer in GPM. cd = the coefficient of discharge, which represents friction loss. d = the actual inside diameter of the hydrant orifice in inches. p = the pressure in...Continue Reading

Sprinkler demand, expressed in gpm, is the amount of water per unit time that is required for adequate sprinkler protection. Theoretically, sprinkler demand is equal to density (gpm/ft^2) multiplied by the demand area (ft^2).Continue Reading

A type of protection in which an enclosure can withstand the pressure developed during an internal explosion of an explosive mixture and that prevents the transmission of the explosion to the explosive atmosphere surrounding the enclosure and that operates at such an external temperature that a surrounding explosive gas or vapour will not be ignited...Continue Reading

Locations in which flammable gases or vapours may or may not be in sufficient quantities to produce explosive or ignitable mixtures.Continue Reading