Plumbing Dictionary


Plumbing termonalogy.

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D

DRAFT HOOD

A device built into an appliance, or made a part of the vent connector from an appliance, which is designed to (1) insure the ready escape of the products of combustion in the event of no draft, back draft, or stoppage beyond the draft hood; (2) prevent a back draft from entering the appliance; and (3) neutralize the effect of stack action of the vent upon the operation of the appliance.

DRAFT REGULATOR

A device which functions to maintain a desired draft in the appliance by automatically reducing the draft to the desired value.

DRAIN

Any pipe that carries waste water or water-borne wastes in a building drainage system.

DRAIN-WASTE-VENT

The system of pipes to safely convey water and waste from fixtures to the building's sewerage outlet.

DRAINAGE

A reversal of flow in the drainage system

DRAINAGE FITTINGS

A special type of fitting or fittings utilized in the drainage system. Drainage fittings are similar to cast-iron fittings, except that instead of having a bell and spigot, drainage fittings are recessed and tapped to eliminate ridges on the inside of the installed pipe.

DRAINAGE FIXTURE UNIT

A measure of the probable discharge into the drainage system by various types of plumbing fixtures. The drainage fixture-unit value for a particular fixture depends on its volume rate of drainage discharge, on the time duration of a single drainage operation and on the average time between successive operations.

DRAINAGE SYSTEM

All of the piping within a public or private premises that conveys sewage, rainwater or other liquid wastes to a point of  disposal. A drainage system does not include the mains of public sewer systems or a private or public sewage treatment or disposal plant.

DRIP

The container placed at a low point in a system of piping to collect condensate and from which the condensate may be removed.

DRY GAS

A gas having a moisture and hydrocarbon dew point below any normal temperature to which the gas piping is exposed.

DUCT FURNACE

A furnace normally installed in distribution ducts or air conditioning systems to supply warm air for heating. This definition shall apply only to an appliance which depends for air circulation on a blower not furnished as part of the furnace.

E

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

ESCUTCHEON

Any decorative threaded flange below or behind a faucet handle. Also an ornamental plate used at the base of a faucet to cover additional holes on a lavatory or kitchen sink.

ESSENTIALLY NONTOXIC TRANSFER FLUIDS

Fluids having a Gosselin rating of 1, including propylene glycol; mineral oil; polydimethylsiloxane;  hydrochlorofluorocarbon, chlorofluorocarbon and hydrofluorocarbon 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.

EXCESS AIR

Air which passes through the combustion chamber and the appliance flues in excess of that which is theoretically required for complete combustion.

EXISTING INSTALLATIONS

Any plumbing system regulated by this code that was legally installed prior to the effective date of this code, or for which a permit to install has been issued.

EXPOSED PIPING

Gas piping which will be in view in the finished structure.

F

FAUCET

A valve end of a water pipe by means of which water is drawn from or held within the pipe.

FINAL

Installation of all the fixtures and the prepration for the use of the plumbing system by the owner.

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