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

The Group defines the type of hazardous material in the surrounding atmosphere. Groups A, B, C, and D are for gases (Class I only).Continue Reading

Group DContinue Reading

Zone 0, 1, and 2 for Gas, and 20, 21, and 22 for Dust.Continue Reading

No, it’s only for General Purpose Weather Proof.Continue Reading

Liquids that have flash points from 21oC up to & including 55oC are handled at or above the flashpoint.Continue Reading

Class 1 is more hazardous than Class 2, so Class 2 could be considered a “safer” or better area compared to Class 1.Continue Reading