Plumbing Terminology
Plumbing Terminology
- Access Chamber: An opening into the ground from which drains can be inspected and rodded or cleaned out, both towards and away from a building, also acting as a junction into which the drainage from other plumbing fixtures may discharge into the horizontal drain.
- Accessible: In reference to a plumbing fixture, appliance, equipment or connection: easily reached, though the use of tools may be required to remove an access panel or open a door.
- Air Break: A physical separation between any pipe and receptor through the free atmosphere. The separation may be below the flood level of the receptor but above the trap seal.
- Air Gap: A physical separation between a safe drinking-water system and above the flood level of the receptor. The separation should be at least twice the supply pipe diameter, but never less that 25 millimetres (1 inch).
- Authority: An individual official, board, ministry or other political entity established and authorized by governmental sanction or a specific law enacted by a governing body that confers statutory powers to formulate and enforce a code of practice for plumbing.
- Backflow: The reversing of the normal flow of water or other substances into the drinking-water distribution system from any unintended source.
- Backpressure: The reversing of normal flow resulting from a pressure downstream that is higher than the supply pressure in the distribution piping of a drinking-water supply system.
- Backsiphonage: The reversing of normal flow resulting from negative or subatmospheric pressures in the distribution piping of a drinking-water supply system.
- Backwater Valve: A device for preventing sewage or drainage water from flowing back into a building in the event of flooding or sewer blockage.
- Black Water: Combined domestic effluent including liquid and solid human body waste and the water discharged from toilet usage.
- Building Drain: The lowest part of a building drainage system where the drainage pipes meet and convey the discharge from within the walls or footings of any building to the building sewer. Also called house drain.
- Building Sewer: That part of the horizontal piping of a drainage system that extends from the end of the building drain and that receives the discharge of the building drain and conveys it to a public sewer, private sewer, private sewage disposal system or other point of disposal. Also called house sewer.
- Building Subdrain: That portion of a drainage system that does not drain by gravity into the building sewer. Also called house subdrain.
- Check Valve: A valve that allows the flow of a liquid in only one direction but closes when the normal direction of flow is reversed.
- Cistern: A vessel open at the top to the atmosphere used to hold a supply of cold drinking-water.
- Cleaning Eye: Same as access chamber.
- Colour Making: The marking of pipes and fittings with different colours to designate the application of the product and to assist installers in identification and prevention of cross-connections.
- Combined Building Drain: A building drain that conveys both sewage and storm water or other drainage.
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Understanding Plumbing Lingo
- Combined Building Sewer: A building sewer that conveys both sewage and storm water or other drainage.
- Conservation: The preservation and protection of natural resources.
- Corrosion: A surface reaction causing a gradual erosion of the material affected.
- Cross-Connection: Any physical connection or arrangement between two otherwise separate piping systems or containment means, one of which contains potable water, and the other water or fluid of unknown or questionable safety.
- Disinfection: Killing or rendering harmless microbial contaminants by chemical or physical processes.
- Downpipe or Downspout: A vertical drainage pipe for conveying storm water from the roof or gutter drains.
- Drain: Any pipe that carries waterborne waste in a building drainage system.
- Drainage System: All the piping within public or private premises that conveys sewage or other liquid wastes to a point of disposal. It does not include the mains of a public sewer system or a public sewage treatment or disposal plant.
- Drain Cock: A valve, usually installed in the lowest portion of a piping system or vessel, that controls the flow of liquid from the system or vessel. Also called drain valve.
- Dual System: A situation in which a second plumbing system is installed alongside the system for provision of drinking-water. An example is a potable drinking-water system and a greywater system in the same facility.
- Electrolysis: A chemical change that occurs when an electric current is generated by the connection of two different metals, either directly or via an electrolyte solution.
- Fixture Unit: An arbitrarily chosen scale or quantity that represents the load of a fixture on a drainage system. One fixture unit was originally established as 7.5 imperial (UK) gallons = 9 US gallons = 34 litres per minute discharge by gravity through a fixture.
- Flammable Waste: Waste that is easily ignited and will burn.
- Float Valve: A valve that operates by means of a bulb or ball floating on the surface of a liquid in a tank or container. The rise and fall action operates a lever, which opens and closes the valve.
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Plumbing Words Made Simple
- Flushometer Valve: A device activated by direct water pressure to discharge a predetermined quantity of water to fixtures for flushing purposes.
- Frost Protection: Methods, such as burial or insulation, used to protect against freezing of pipes or fixtures.
- Grease Interceptor: A device, usually outside a building, that retains grease and prevents it passing into the sewerage system.
- Grease Trap: A grease interceptor installed inside a facility, usually near the grease-producing fixtures.
- Green Water: Reclaimed water that has been treated to a standard, suitable for general domestic non-potable applications. It may be identified through inclusion of a green dye and supplied through a dedicated colour-coded pipework system.
- Greywater: Water that has already been used for bathing, washing, laundry or dishwashing, but does not contain excreta.
- Indirect Connections: Waste piping that discharges into a receptor or interceptor through an air break or air gap into the drainage system.
- Industrial Waste: Liquid or waterborne waste from industrial or commercial processes.
- Interceptor: A device used to separate deleterious, hazardous or undesirable matter from normal wastes, retaining it while permitting normal sewage or liquid wastes to discharge into the drainage system by gravity.
- Liquid Waste: The discharge from any fixture, appliance or appurtenance in connection with a plumbing system that does not receive fecal matter.
- Mixing Valve: A valve or faucet that mixes liquids using automatic or manual regulation.
- Negative Pressure: Pressure below the external atmosphere pressure, taking into account the local elevation.
- Oil Trap: An interceptor used to retain oil and prevent it passing into sewers.
- Overflow System: An outlet or receptacle designed to collect surplus liquids after the desired amount has been received.
- pH: The negative logarithm (base 10) of the hydrogen concentration. On the scale of 0 to 14, 7 is neutral, lower numbers are acidic, and higher numbers are basic.
- Plumbing Fixture: A general term applied to any plumbing receptacle, device or appliance that can be temporarily or permanently fixed in place. It is connected to the drinking-water supply or to the drainage system either by an indirect or direct connection.
- Potable Water: Same as drinking-water.
- Pressure Reduction Valve: A device that regulates pressure in liquids or gases by reducing a higher pressure to a definite lower pressure, maintaining the liquids or gases at a constant pressure.
- Pressure Relief Valve: A safety valve that is held closed by a spring or other means and automatically relieves the pressure in excess of its setting.