Plumbing Dictionary


Plumbing termonalogy.

Browse the glossary using this index

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BACKFLOW Backpressure

Pressure created by any means in the water distribution system, which by being in excess of the pressure in the water supply mains causes a potential backflow condition.

BACKFLOW Backpressure Sewer

low head, A pressure less than or equal to 4.33 psi  (29.88 kPa) or the pressure exerted by a 10-foot (3048 rom) column of water.

BACKFLOW Backpressure Water

Pressure created by any means in the water distribution system, which by being in excess of the pressure in the water supply mains causes a potential backflow condition.

BACKFLOW CONNECTION

Any arrangement whereby backflow is possible.

BAFFLE

An object placed in an appliance to change the direction of or retard the flow of air, air-gas mixtures, or flue gases.

BALL COCK

A water supply valve, opened or closed by means of a float or similar device, utilized to supply water to a tank. An anti siphon ball ** contains an anti siphon device in the form of an approved air gap or vacuum breaker that is an integral part of the ball ** unit and that is positioned on the discharge side of the water supply control valve.

BASE FLOOD ELEVATION

A reference point, determined in accordance with the building code, based on the depth or peak elevation of flooding, including wave height, which has a I-percent (1OO-year flood) or greater chance of occurring in any given year.

BATHROOM

A room containing a bathtub or shower for use by a person to bathe or cleanse one's self, located in or adjacent to a residence, apartment, hotel, motel, or similar type building.

BATHROOM GROUP

A group of fixtures, including or excluding a bidet, and consisting of a water closet, lavatory, and bathtub or shower. Such fixtures are located together on the same floor level.

BEDPAN STEAMER OR BOILER

A fixture utilized for scalding bedpans or urinals by direct application of steam or boiling water.

BEDPAN WASHER AND STERILIZER

A fixture designed to wash bedpans and to flush the contents into the sanitary drainage system. Included are fixtures of this type that provide for disinfecting utensils by scalding with steam or hot water.

BEDPAN WASHER HOSE

A device supplied with hot and cold water and located adjacent to a water closet or clinical sink to be utilized for cleansing bedpans.

BOILER

A self-containing gas burning appliance for supplying hot water or low pressure steam, primarily intended for domestic and commercial space heating application.

BRANCH

Any part of the piping system except a riser, main or stack.

BRANCH INTERVAL

A distance along a soil or waste stack corresponding in general to a story height, but not less than 8 feet (2438 mm), within which the horizontal branches from one floor or story of a structure are connected to the stack.

BRANCH LINE

Gas piping which conveys gas from a supply line to the appliance.

BRANCH VENT

A vent connecting one or more individual vents with a vent stack or stack vent.

BRAZING

A metal joining process wherein coalescence is produced by the use of a nonferrous filler metal having a melting point above 1,000¦ F (538 C) but lower than that of the base metal being joined. The filler material is distributed between the closely fitted surfaces of the joint by capillary attraction.

BRITISH THERMAL UNIT

British thermal unit which is the quantity of heat required to raise the temperature of one pound (454 g) of water 1 degree (0.55 C) Fahrenheit (1 BTU = 1055 J).

BROILER UNIT

A separate appliance, a general term including broilers, salamanders, barbecues, and other devices cooking primarily by radiated heat, excepting toasters.

BUILDING

Any structure occupied or intended for supporting or sheltering any occupancy.

BUILDING DRAIN

That part of the lowest piping of a drainage system that receives the discharge from soil, waste and other drainage pipes inside and that extends 30 inches (762 mm) beyond the walls of the building and conveys the drainage to the building sewer.

BUILDING DRAIN Combined

A building drain that conveys both sewage and storm water or other drainage.

BUILDING DRAIN Sanitary

A building drain that conveys sewage only.

BUILDING DRAIN Storm

A building drain that conveys storm water or other drainage, but not sewage.

BUILDING PIPING GAS

The gas piping from the point where it enters the building or foundation to and including the outlets. This is applicable where the gas meter is located some distance from the building or LP gas is delivered without a meter. The gas piping from the gas meter to and including the outlets. This is applicable where the gas meter is located in or immediately adjacent to the building.

BUILDING SEWER

That part of the drainage system that extends from the end of the building drain and conveys the discharge to a public sewer, private sewer, individual sewage disposal system or other point of disposal.

BUILDING SUBDRAIN

That portion of a drainage system that does not drain by gravity into the building sewer.

BUILDING TRAP

A device, fitting or assembly of fittings installed in the building drain to prevent circulation of air between the drainage system of the building and the building sewer.

BURNER

A device for the final conveyance of the gas, or a mixture of gas and air, to the combustion zone.

BURNER Atmospheric injection type

A burner in which the air at atmospheric pressure is injected into the burner by a jet of gas.

BURNER Injection (Bunsen) type

A burner employing the energy of a jet of gas to inject air for combustion into the burner and mix it with the gas.

BURNER Luminous or yellow flame

A burner in which secondary air only is depended on for the combustion of the gas.

BURNER Power

A burner in which either gas or air or both are supplied at pressures exceeding, for gas, the line pressure, and for air, atmospheric pressure, this added pressure being applied at the burner.

BURNER Pre-mixing

A power burner in which all or nearly all of the air for combustion is mixed with the gas as primary air.

BURNER Pressure

A burner which is supplied with an air-gas mixture under pressure (usually from 0.5 to 14 inches of water [124 to 3483 Pa] and occasionally higher).

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