Glossary of Plumbing Terms
EFFECTIVE OPENING The minimum cross sectional area at the point of water supply discharge, measured or expressed in terms of the diameter of a circle or, if the opening is not circular, the diameter of a circle of equivalent cross sectional area. For faucets and similar fittings, the effective opening shall be measured at the smallest orifice in the fitting body or in the supply piping to the fitting.
ESSENTIALLY NON TOXIC TRANSFER FLUIDS Fluids having a Gosselin rating of 1, including propylene glycol, mineral oil, polydimethyl,siloxane, hydrochloroflouro-carbon, chlorofluorocarbon and carbon refrigerants and FDA approved boiler water additives for steam boilers.
ESSENTIALLY TOXIC TRANSFER FLUIDS Soil, waste or gray water and fluids having a Gosselin rating of 2 or more including ethylene glycol, hydrocarbon oils ammonia refrigerants and hydrazine.
EXPANSION JOINT A loop, return bend or return offset that provides for the expansion and contraction in a piping system and is utilized in tall buildings or where there is a rapid change of temperature, as in power plants, steam rooms and similar occupancies.
EXISTING INSTALLATIONS Any plumbing system regulated by this code that was installed, or for which an approval has been issued.