Plumbing Dictionary


Plumbing termonalogy.

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U

UNLISTED BOILER

A boiler not listed by a nationally recognized testing agency or a boiler not originally furnished by the manufacturer with integrally assembled gas burner and automatic control devices.

UNMEASURED GAS

Gas which has not passed through and the volume of which has not been registered by a meter, or gas which has not otherwise been measured, such as by liquid volume or weight.

UNSTABLE GROUND

Earth that does not provide a uniform bearing for the barrel of the sewer pipe between the joints at the bottom of the pipe trench.

UNUSUALLY TIGHT CONSTRUCTION

Construction meeting the following requirements: Walls and ceilings exposed to the outside atmosphere have a continuous water vapor retarder with a rating of one perm (57.4 ng/s .m2 .Pa) or less with openings gasketed or sealed, and Storm windows or weather-stripping on open able windows and doors, and Caulking or sealants applied to areas such as joints around window and door frames, between sole plates and floors, between wall-ceiling joints, between wall panels, at penetrations for plumbing, electrical, and gas lines, and at other openings.

UNVENTED ROOM HEATER

An unvented self-contained, free standing, nonrecessed (except as defined under ALL WEATHER, UNVENTED CLOSED FRONT), gas-burning appliance for furnishing warm air by gravity or fan circulation to the space in which installed directly from the heater without duct connection.

URINAL

Water-flushed plumbing fixture designed to receive only liquid waste which is conveyed through a trap seal into a gravity drainage system.

V

VACUUM

Any pressure less than that exerted by the atmosphere.

VACUUM BREAKER

A type of backflow preventer installed on openings subject to normal atmospheric pressure that prevents backflow by admitting atmospheric pressure through ports to the discharge side of the device. Device which opens when a vacuum occurs to prevent the backward flow of water in a supply line and contamination of the potable water supply.

VALVE

See MANUAL SHUTOFF VAL VB.

VALVE LUBRICATED PLUG TYPE

A valve of the plug and barrel type provided with means for maintaining a lubricant between the bearing surfaces.

VALVE MAIN BURNER CONTROL

A valve which controls the gas supply to the main burner manifold.

VALVE MANUAL SHUTOFF

A valve (or **) of the plug and barrel type designed for use with gas, operated manually to control or shut off the supply of gas.

VENT

A passageway for conveying flue gases from fuel-burning appliances, or their vent connectors, to the outside atmosphere.

VENT CONNECTOR

That portion of the vent system which connects the gas appliance to the gas vent or chimney.

VENT DAMPER DEVICE, AUTOMATIC

A device intended for installation in the venting system, in the outlet of or downstream of the appliance draft hood, of an individual automatically operated fuel-gas burning appliance and which is designed to automatically open the venting system when the appliance is in operation and to automatically close off the venting system when the appliance is in a standby or shutdown condition.

VENT DAMPER DEVICE, AUTOMATIC Electrically operated

employs electrical energy to control the device.

VENT DAMPER DEVICE, AUTOMATIC Mechanically actuated

dependent for operation upon the direct application or transmission of mechanical energy without employing any type of energy conversion.

VENT DAMPER DEVICE, AUTOMATIC Thermally actuated

dependent for operation exclusively upon the direct conversion of the thermal energy of the vent gases into mechanical energy.

VENT GASES

Products of combustion from gas appliances plus excess air plus dilution air in the vent connector, gas vent or chimney above the draft hood or draft regulator.

VENT PIPE

See "Vent system."

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