NV Journeyman Plumber flashcards

32 cards. Read the term and the definition here. The deck at the top of this page is optional.

Potable water

Water that is free of impurities in amounts that could constitute a health hazard and that meets the primary and secondary drinking water standards for human consumption.

Drainage fixture unit

A numerical value assigned to a fixture that represents its probable total discharge rate into the drainage system, used to size drains, stacks, and building sewers.

Authority having jurisdiction

The organization, office, or individual responsible for enforcing the plumbing code, approving materials and methods, and issuing permits and inspections for the work.

Building drain

The lowest piping of a drainage system that receives waste from inside the building and extends 30 inches beyond the exterior wall to connect to the building sewer.

Rough-in inspection

The inspection of drain, waste, vent, and water-supply piping after installation but before concealment, required so the AHJ can verify compliance before walls close.

Water closet flush limit

The maximum allowable flush volume for a water closet, 1.6 gallons per flush, established by federal and state efficiency standards adopted into the plumbing code.

Temperature and pressure relief valve

A safety device on a water heater that opens when temperature or pressure exceeds its rating, discharging through a full-size pipe to a safe point of disposal.

Flood level rim

The edge of the receptacle from which water overflows; it is the reference point for measuring air gaps and for determining backflow protection requirements at a fixture.

Water supply fixture unit

A numerical value expressing the probable demand of a fixture on the water distribution system, used with the Hunter curve to convert load to gallons per minute.

Residual pressure

The pressure remaining at a fixture outlet while water is flowing; codes require a minimum, commonly 8 psi for tank fixtures and 15 psi for flushometer valves.

Pressure-reducing valve

A device installed where static water pressure exceeds 80 psi to lower and maintain downstream pressure within the limits allowed for the fixtures and piping.

Developed length

The total length of a pipe measured along its centerline, including the equivalent lengths of fittings and valves, used for sizing water and drain lines.

Trap arm

The portion of a fixture drain between the trap weir and the vent connection; its length and slope are limited so the trap seal is not siphoned.

Stack vent

The extension of a soil or waste stack above the highest horizontal drain connected to it, terminating in open air above the roof to relieve pressure in the stack.

Cleanout

An accessible fitting with a removable plug that provides access to a drain for clearing stoppages, required at stack bases, ends of runs, and intervals along horizontal drains.

Vent stack

A vertical vent pipe installed to provide air circulation to and from the drainage system, extending to open air above the roof and sized to the drains it serves.

Trap seal

The water retained in a trap after each use, at least 2 inches and at most 4 inches deep, that prevents sewer gas from entering the building.

Grease interceptor

A device installed in the waste line from a commercial kitchen to separate and retain fats, oils, and grease so they do not enter and clog the building sewer.

Backwater valve

A device installed on a drain to prevent sewage from flowing backward into the building when the public sewer surcharges, required where fixtures are below the upstream manhole.

Indirect waste receptor

A fixture that receives clear-water waste through an air gap, preventing backflow from the drainage system into the fixture or equipment being drained.

Sediment trap

A drip leg installed at the appliance connection on gas piping to collect dirt and moisture, arranged so gas flow turns upward into the appliance.

Longest-run method

A gas pipe sizing procedure that totals the connected Btu load, measures the longest developed length from the meter, and reads the required pipe size from the capacity table.

Combustion air

The air required for complete burning of fuel gas, supplied to an appliance through openings, ducts, or the room volume per the code's combustion air requirements.

Cross-connection

Any actual or potential connection between the potable water supply and a source of contamination or pollution that could allow backflow into the drinking water system.

Reduced pressure zone assembly

A testable backflow preventer with two check valves and a relief valve, used for high-hazard protection and requiring annual testing by a certified tester.

Backsiphonage

Backflow caused by a negative or sub-atmospheric pressure in the supply piping, which draws non-potable liquid through a cross-connection into the potable system.

Atmospheric vacuum breaker

A backflow device with a float check that admits air when supply pressure drops; it must be installed at least 6 inches above the highest downstream outlet.

Isometric drawing

A three-dimensional drawing using three axes 120 degrees apart, with vertical lines remaining vertical and horizontal lines drawn at 30 degrees, used to lay out piping systems.

Material takeoff

A list of pipe, fittings, fixtures, and valves required for a job, compiled from the plans by measuring runs and counting components, with a waste factor added.

Riser diagram

A schematic drawing showing the vertical arrangement of stacks, vents, and water risers in a building, indicating sizes, fixture connections, and floor levels.

Confined space

A space with limited entry and exit that is not designed for continuous occupancy; entry requires a permit, atmospheric testing, an attendant, and rescue provisions.

Nevada State Contractors Board

The state agency that licenses plumbing contractors, administers trade exams, requires bonds and insurance, and investigates complaints against licensed and unlicensed contractors.