Plumbing Dictionary


Plumbing termonalogy.

Browse the glossary using this index

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P

PILOT

A small flame which is utilized to ignite the gas at the main burner or burners.

Pipe

A rigid conduit of iron, steel, copper, brass, or plastic.

PIPING

Where the word piping is used in this code, it refers to either pipe or tubing, or both.

PLASTIC, THERMOPLASTIC

A plastic which is capable of being repeatedly softened by increase of temperature and hardened by decrease of temperature.

PLASTIC, THERMOSETTING

A plastic which is capable of being changed into a substantially infusible or insoluble product when cured under application of heat or chemical means.

PLENUM

Air compartment or chamber to which one or more ducts are connected and which forms part of an air distribution system.

PLUMBING

The practice, materials and fixtures utilized in the installation, maintenance, extension and alteration of all piping, fixtures, plumbing appliances and plumbing appurtenances, within or adjacent to any structure, in connection with sanitary drainage or storm drainage facilities; venting systems; and public or private water supply systems. Not included in this definition are installations of chilled water piping in connection with refrigeration, process and comfort cooling; hot water piping in connection with building heating; and piping for fire protection systems.

PLUMBING APPLIANCE

Anyone of a special class of plumbing fixtures intended to perform a special function. Included are fixtures having the operation or control dependent on one or more energized components, such as motors, controls, heating elements, or pressure- or temperature-sensing elements. Such fixtures are manually adjusted or controlled by the owner or operator, or are operated automatically through one or more of the following actions: a time cycle, a temperature range, a pressure range, a measured volume or weight.

PLUMBING APPURTENANCE

A manufactured device, prefabricated assembly or an on-the-job assembly of component parts that is an adjunct to the basic piping system and plumbing fixtures. An appurtenance demands no additional water supply and does not add any discharge load to a fixture or to the drainage system.

PLUMBING FIXTURE

A receptacle or device that is either permanently or temporarily connected to the water distribution system of the premises and demands a supply of water there from; discharges waste water, liquid-borne waste materials or sewage either directly or indirectly to the drainage system of the premises; or requires both a water supply connection and a discharge to the drainage system of the premises.

PLUMBING SYSTEM

Includes the water supply and distribution pipes; plumbing fixtures and traps; water-treating or water-using equipment; soil, waste and vent pipes; and sanitary and storm sewers and building drains, in addition to their respective connections, devices and appurtenances within a structure or premises.

POINT OF DELIVERY

The initial junction of the consumers' piping with either the gas company piping extending from the gas main and/or the regulator which reduces the pressure of the undiluted liquefied petroleum gas to the pressure normally delivered to appliances.

POLLUTION

An impairment of the quality of the potable water to a degree that does not create a hazard to the public health but that does adversely and unreasonably affect the aesthetic qualities of such potable waters for domestic use.

POTABLE WATER

Water free from impurities present in amounts sufficient to cause disease or harmful physiological effects and conforming in bacteriological and chemical quality to the requirements of the Public Health Service Drinking Water Standards or the regulations of the public health authority having jurisdiction.

PRIMARY AIR

The air introduced into a burner and mixing with the gas before it reaches the port or ports.

PRIVATE

In the classification of plumbing fixtures, "private" applies to fixtures in residences and apartments, and to fixtures in nonpublic toilet rooms of hotels and motels and similar installations in buildings where the plumbing fixtures are intended for utilization by a family or an individual.

PUBLIC OR PUBLIC UTILIZATION

In the classification of plumbing fixtures, "public" applies to fixtures in general toilet rooms of schools, gymnasiums, hotels, airports, bus and railroad stations, public buildings, bars, public comfort stations, office buildings, stadiums, stores, restaurants, and other installations where a number of fixtures are installed so that their utilization is similarly unrestricted.

PUBLIC WATER MAIN

A water supply pipe for public utilization controlled by public authority.

PURGE

To free a gas conduit of air, gas, or a mixture of gas and air.