Where internal water contact parts of valves known as trim materials (stem, disc, seat rings, etc.) are made of bronze.

Abbreviation for British thermal units per hour.

A valve seat that does not allow visible bubbles to appear when the valve is closed.

A structure having walls and a roof designed and used for housing, shelter, enclosure, or support of people, animals, and property.

Often called a house drain, the lowest piping of a drainage system that receives the discharge from soil, waste, and other drainage pipes inside the walls of a building and conveys it outside the building to a distance from 2 to 5 ft (0.70 to 1.70 m). This drain could be sanitary only, stormwater only, or combined stormwater and sanitary.

Also called a house sewer, that part of the horizontal piping of a drainage system that extends from the end of the building drain outside the building and conveys the wastewater to a public sewer, private sewer, individual sewage-disposal system, or other approved point of disposal.

That portion of a drainage system below the building sewer that cannot drain by gravity.

Commonly called a house trap, a device, fitting, or assembly of fittings installed in the house drain to prevent the circulation of air between the house drain and the house sewer. It is usually installed as a running trap.

A tee in which the branch is larger than the run.

A roughness of extra metal protruding from a pipe, usually caused by pipe cutting.

The maximum design pressure, usually four times normal operating pressure, applied to a piping assembly without causing rupture.

A pipe fitting that is solid plate with a hole in the center.

A valve deriving its name from the wing-like action of the disc, which operates at right angles to the flow.

A joint made with the two pipes ends or edges brought together and melted at the junction.

A pipeline with valves intended for diverting flow in a different direction or around a piece of equipment.

A device used to divert the flow past the part of the system through which it normally passes.

Comparison of the graduation of an instrument with a standard of known accuracy to eliminate variation.

A small roof protecting a window or entrance.

The maximum or minimum flow obtainable under given conditions of media, temperature, pressure, velocity, etc.. The volume of media that may be stored in a container or receptacle.

The action by which a liquid is drawn into a void, primarily observed during soldering.

A drainage structure used to collect stormwater only to enter a drainage system.

The control of electrolytic corrosion by the application of an electric current in such a way that the structure is made to act as the cathode instead of the anode of an electrolytic cell.

A method of sealing a space tight against the passage of water or gas by means of applying a substance to adjacent surfaces.

The formation of bubbles in a liquid because of a partial vacuum, which damages adjacent parts when these bubbles revert back to a liquid.

The union of two fittings by the insertion of material, accomplished mechanically or chemically.

Sometimes called a leaching cesspool, an excavation in the ground that receives the discharge of a drainage system and retains the organic matter and solids discharged but permit the liquids to seep through the bottom and sides.

A method of operating a valve by means of a chain-driven wheel.

A trough through which any media may flow.

A recess in a wall or a space in which pipes can be run.

A device designed to allow a fluid to pass through in one direction only.

Piping that conveys corrosive or harmful industrial, chemical, or processed wastes to a separate drainage system.

The directed route taken by a flow of media from one point to another.

A branch vent that serves two or more traps and extends from in front of the last fixture to the connection with the vent stack.

A covered tank used for storing water, placed underground in many cases.

The potable water supply provided by a public utility.

An opening or fitting in a pipe that can be removed for the purpose of cleaning or examining the interior of the pipe.

A particle-controlled area in which filtered air is supplied to maintain a specified level of cleanliness.

Clear wastewater drainage from equipment, rooms, and other areas that does not contain contaminants considered harmful.

A short piece of pipe used to connect various fittings.

The impingement of small-diameter aerosols that causes them to merge.

Often used nomenclature for a faucet.

Regulations, subsequent amendments thereto, and any emergency rules that the department having jurisdiction may lawfully adopt.

The numerical value that describes the increase in unit length and area of volume as a result of heat.

The deformation of a material attributed to the pressure or forces acting at ambient temperatures.

Organisms considered to be in the coli aerogenes group.

A fixture that combines one sink and tray or a two- or three-compartment sink and/or tray in one unit.

A specially designed system of waste piping, embodying the horizontal wet venting of one or more sinks, floor sinks, or floor drains by means of a common waste and vent pipe, adequately sized to provide the free movement of air above the flow line of the drain

Any liquid with a closed-cup flash point at or above 37.8°C (100°F), classified as follows: Class II liquid: a flash point at or above 37.8°C (100°F) and below 60°C (140°F); Class IIIA liquid: a flash point at or above 60°C (140°F) and below 93°C (200°F); Class IIIB liquid: a flash point at or above 93°C (200°F).

The rated percentage of heat produced compared to the actual heat transferred to the medium being heated.

A vent that connects at the junction of two fixture drains and serves as a vent for both fixtures.

A mechanical device used to increase the pressure of air or gas.

Molecules that separate from a gas upon cooling.

The ability of a substance to conduct heat or electricity.

The piping conveying stormwater from a building to a point of disposal.

A pipe or channel for conveying media.

The total number of fixtures, equipment, or devices attached to a system.

A vent serving more than one fixture vent or stack vent.

All drawings, specifications, and other written papers prepared or assembled for the purpose of describing the design, location, and physical characteristics necessary for obtaining permits and building a facility.

A degradation of quality in any material that creates a hazard to public health.

A medium or condition that spoils the nature or quality of another medium.

A vertical vent that is a continuation of the drain to which it connects.

A drain from two or three fixtures connected to a single trap.

A manual or automatic device that regulates a machine or process.

A cabinet containing the motor starter, circuit breaker, disconnect switch, and other control devices for the control of electric motors and internal combustion-engine-driven fire pumps.

A stopcock screwed into the street water main to supply the house service connection.

The ability of a chemical compound or material to attack, eat away, and damage materials or human beings.

A pipe fitting with female threads used only to connect two pipes in a straight line.

The elongation of a material due to heat or stress.

A reference point on a backflow prevention device or vacuum breaker that determines the minimum elevation above the flood level rim of a fixture or receptacle at which the device may be installed. When a backflow prevention device does not bear critical-level marking, the bottom of the vacuum breaker or combination valve or the bottom of any such approved device shall constitute the critical level.

The transition point at which a liquid and gas state merge into one another.

A pipe fitting with four branches each at 90 degrees to each other.

Any physical connection or arrangement between two otherwise separated piping systems one of which contains potable water and the other of which contains a liquid or another substance of unknown or questionable safety—whereby flow may occur from one system to the other, the direction of flow depending on the pressure differential between the two systems.

A pipe fitting with a double offset, or shaped like the letter U with the ends turned out, used to pass the flow of one pipe past another when the pipes are in the same plane.

A valve fitted on a transverse pipe so as to open communication between two parallel pipes.

The upper part of a trap where the direction of flow is changed from upward to horizontal.

A vent pipe connected at the topmost point of a trap.

The field of low temperature.

An enclosure or chamber located at the curb that contains a shutoff valve on the supply line for gas or water to a building.

A drainage structure that allows stormwater to enter a drainage system from an opening in a road.

A valve in a public location that controls the supply of water to a building.

To deaden vibration. To check or reduce.

A pipe, 2 ft (0.70 m) or more, terminated by means of a plug, cap, or other fitting that closes off the end of a pipe.

A trap with a longer water seal than that required by code.

A material that changes state in the presence of water.

Estimated flow or use expected under specific operating conditions.

The ratio of the weight of a substance to its volume.

A material that easily adsorbs water vapor.

The specific point in a piping network where a pipe size is calculated.

A listed device for sensing the visible or invisible products of combustion.

The length along the centerline of pipe and fittings.

The temperature at which water in the air will start to condense on a surface.

The nominal inside diameter of a pipe as commercially designated unless otherwise noted.

A flexible disc that is used as a closure member in some valves.

A fitting having insulating parts or material that prohibits the flow of electric current.

The variance between two target values.

A separation of compounds dissolved in water into ions.

A percent of estimated usage compared to the connected load.

A process in which biochemical decomposition of organic matter takes place, resulting in the formation of simple organic and mineral substances.

A closure member in some types of valves that closes off the flow.

An appliance for washing dishes, glassware, flatware, and utensils.