AR Plumber flashcards

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

Master plumber license

Arkansas credential authorizing the holder to contract for plumbing work, obtain permits, and supervise other plumbers on the job.

Journeyman plumber

Licensed plumber who installs and repairs plumbing under a master plumber's supervision but who may not contract for plumbing work independently.

Arkansas State Plumbing Code

State plumbing regulation built on the International Plumbing Code with Arkansas amendments; it sets the installation standards enforced statewide.

Plumbing permit

Written authorization from the authority having jurisdiction that is required before installing, altering, or replacing plumbing; minor repairs are exempt.

DWV hydrostatic test

Drainage and vent systems are tested with a 10-foot head of water, or with 5 psi of air held for 15 minutes, to prove tightness.

Final plumbing inspection

Inspection performed after fixtures are set and systems tested; approval is required before the building can legally be occupied.

Drainage fixture unit

Measure of drainage load; one DFU approximates a lavatory's discharge while a tank-type water closet is rated at 3 DFU.

Drainage slope rule

Horizontal drains 2½ inches and smaller slope ¼ inch per foot; pipe from 3 through 6 inches slopes ⅛ inch per foot.

45-degree offset travel

In an isometric layout, the diagonal travel of a 45-degree offset equals the offset distance multiplied by 1.414.

Feet of head

One psi equals about 2.31 feet of water column; multiply pressure in psi by 2.31 to convert it to head in feet.

Residual pressure

Flowing pressure remaining at a fixture; at least 8 psi is required generally and 15 psi at flushometer valves.

Pressure-reducing valve

Device installed when static water pressure exceeds 80 psi to protect fixtures, appliances, and piping from excessive pressure.

Water hammer arrestor

Air-charged device placed near quick-closing valves to absorb the shock wave created when flow stops suddenly.

Developed length

Total effective pipe length including fittings; used together with fixture units to size water supply piping.

Water closet clearance

A water closet needs at least 15 inches from its centerline to any sidewall and at least 30 inches of clear width.

Accessible lavatory height

An accessible lavatory rim must be no higher than 34 inches above the finished floor, with knee clearance beneath it.

Fixture flow limits

Federal maximums: 1.6 gallons per flush for water closets, 2.5 gpm for showerheads, and 2.2 gpm for faucets.

Building drain

Lowest piping of the drainage system inside the building; it receives waste and carries it to the building sewer.

Cleanout

Access opening in a drainage line for removing blockages; required at stack bases and at horizontal changes of 45 degrees or more.

Backwater valve

One-way valve on a drainage line that stops sewage from flowing backward into fixtures when the public sewer surcharges.

Vent terminal

Upper end of a vent stack; it must extend 6 inches above the roof and be kept away from windows and air intakes.

Wet vent

A vent that also serves as a drain for another fixture, permitted only when both fixtures are on the same floor.

Air admittance valve

One-way valve that admits air into a vent to equalize pressure; allowed only where the code permits and must stay accessible.

Trap seal

Depth of water in a trap that blocks sewer gas; it must be at least 2 inches and no more than 4 inches.

Air gap

Unobstructed vertical distance between a water outlet and the flood-level rim of a fixture; the most reliable backflow protection.

Reduced pressure zone device

Testable backflow preventer with two check valves and a relief valve, used to protect against high-hazard cross-connections.

T&P relief valve

Safety valve on a water heater that opens at excessive temperature or pressure, typically set at 210 degrees Fahrenheit or 150 psi.

Thermal expansion tank

Closed tank with an air charge that absorbs the volume of water expanding in a closed plumbing system as it heats.

Water heater drain pan

Watertight pan placed beneath a water heater where leakage could cause damage; it must be drained to an approved location.

Secondary roof drain

Backup roof drain set higher than the primary drain that provides an alternate flow path when the primary drain is blocked.

Sediment trap

Short downward leg of gas piping that catches dirt and moisture before it can reach an appliance's gas controls.

Sewage ejector

Pump and receiving basin that lift drainage from fixtures located below the level of the public sewer to a gravity drain.