OK Plumber flashcards

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

Fixture unit

A dimensionless value that estimates the probable load a fixture places on the drainage or water supply system, used to size pipe, traps, and vents.

Developed length

The total pipe length measured along the centerline plus the equivalent length added for fittings and valves, used in drainage and water sizing calculations.

Master plumber license

The highest Oklahoma plumbing credential, issued by the Construction Industries Board, which allows the holder to qualify and supervise plumbing contracting work and journeymen.

Authority having jurisdiction

The code official or agency that enforces the plumbing code, issues permits, performs inspections, and may approve alternate materials or require proof tests.

Rough-in inspection

A code inspection performed after piping is installed but before walls, ceilings, or floors are closed, verifying drain, waste, vent, and water piping and its support.

Static pressure at fixtures

Water pressure at fixtures may not exceed 80 psi static; when the building supply is higher, a pressure-reducing valve is installed on the supply.

Water service burial depth

Water service pipe is buried at least 12 inches below grade and below the local frost depth so the line is protected from freezing and physical damage.

T&P relief valve discharge

The water heater temperature and pressure relief valve discharges through a full-size, unthreaded pipe ending not more than 6 inches above the floor or outside the building.

Water hammer arrestor

A listed device installed near quick-closing valves, such as those on dishwashers and washing machines, to absorb pressure surges created when flow stops suddenly.

Backflow prevention device

An approved assembly or method, such as an air gap, vacuum breaker, or reduced-pressure assembly, that keeps contaminated water from reversing into the potable supply.

Trap seal depth range

Every fixture trap must hold a liquid seal at least 2 inches deep and no more than 4 inches deep, blocking sewer gas without restricting flow.

Trap arm length limit

The developed length from the fixture outlet to the trap weir may not exceed 24 inches vertically or 30 inches horizontally.

Building drain slope

Horizontal drains slope at least 1/4 inch per foot for pipe 2-1/2 inches and smaller, and at least 1/8 inch per foot for 3-inch and larger pipe.

Cleanout location rules

Cleanouts are required at the base of each stack, at the building sewer, at changes of direction greater than 45 degrees, and at each 100 feet of aggregate horizontal run.

Vent size minimum

A vent must be at least 1-1/4 inches in diameter and may not be smaller than one-half the diameter of the drain it serves.

Vent terminal height

A vent stack terminates outdoors not less than 6 inches above the roof surface and at least 10 feet horizontally from any lot line.

S-trap prohibition

A trap formed by a double bend in the vertical direction is prohibited because it self-siphons; fixture drains must connect through a properly vented trap arm.

Water closet flush volume

Water closets installed must be listed and labeled to use no more than 1.6 gallons per flush, the federal maximum for tank-type closets.

Showerhead flow limit

Showerheads must be listed to limit flow to not more than 2.5 gallons per minute at an inlet pressure of 80 psi.

Washing machine standpipe

A clothes washer standpipe must be at least 2 inches in diameter and must terminate between 18 inches and 42 inches above the trap weir.

Air gap definition

The unobstructed vertical distance between a water supply outlet and the flood level rim of the fixture it serves, at least twice the outlet's effective opening.

Floor drain trap primer

An automatic device that adds water to a floor drain trap so the seal does not evaporate in drains that rarely receive flow, preventing sewer gas entry.

Sediment trap

A dirt leg installed on the gas piping downstream of the appliance shutoff valve so debris and pipe scale settle before reaching the appliance gas controls.

Appliance connector length

A flexible gas appliance connector may not exceed 6 feet, may not be concealed, and only one connector may be used for each appliance.

Gas pipe support interval

Horizontal steel gas piping is supported at intervals not exceeding 6 feet for 1/2-inch pipe, 8 feet for 3/4 and 1 inch, and 10 feet for larger sizes.

Gas shutoff valve

A listed manual shutoff valve must be installed in the gas piping immediately ahead of each appliance, in the same room and accessible for operation.

Gas piping pressure test

Before appliances are connected or gas is turned on, the piping is tested with air or inert gas at the code-specified pressure and time with a visible gauge.

Garage appliance elevation

Gas-fired appliances with an ignition source in a garage must be raised so the ignition source is at least 18 inches above the floor unless listed as flammable-vapor ignition resistant.

Call 811 before digging

Oklahoma law requires notifying the One-Call system before excavation so buried utilities are marked, and lines near the marks must be exposed by hand.

Excavation protective system

Any trench 5 feet deep or more needs sloping, benching, or shoring, plus a ladder or ramp providing exit within 25 feet of lateral travel.

Fire watch for hot work

A fire watch is maintained during soldering or brazing and for at least 30 minutes afterward, with combustibles cleared and a fire extinguisher immediately available.

Confined space atmosphere testing

Before entry, test a confined space for oxygen, flammable gas, carbon monoxide, and hydrogen sulfide, then ventilate until readings are safe.