Plumbing Dictionary


Plumbing termonalogy.

Browse the glossary using this index

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D

DEAD END

A branch leading from a soil, waste or vent pipe; a building drain; or a building sewer, and terminating at a developed length of 2 feet (610 mm) or more by means of a plug, cap or other closed fitting.

DECORATIVE APPLIANCE, VENTED

A vented appliance whose only function lies in the esthetic effect of the flames.

DEMAND

The maximum amount of gas required per unit of time, usually expressed in cubic feet per hour, or Btu per hour (1 Btu per hour = 0.2931 Watts), required for the operation of the appliance or appliances supplied.

DEPTH OF WATER SEAL

The depth of water that would have to be removed from a full trap before air could pass through the trap.

DEVELOPED LENGTH

The length of a pipeline measured along the centerline of the pipe and fittings.

DILUTION AIR

Air which enters a draft hood or draft regulator and mixes with flue gases.

DIRECT GAS-FIRED MAKE-UP AIR HEATER

A heater used to temper make-up air in which all the heat and products of combustion generated by the gas burner are released into the air stream being heated.

DIRECT VENT APPLIANCES

Appliances which are so constructed and installed that all air for combustion is derived from and all flue gases are discharged to the outside atmosphere.

DISCHARGE PIPE

A pipe that conveys the discharges from plumbing fixtures or appliances.

DIVERSITY FACTOR

Ratio of the maximum probable demand to the maximum possible demand.

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.

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