WI Plumber flashcards
WI Plumber · Build recall with a focused review session.
32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Psi to feet of head
- Multiply psi by 2.31 to convert pressure into feet of water column, and multiply feet of head by 0.433 to convert back into psi.
- Weight of one gallon
- One gallon of water weighs 8.34 pounds and occupies 231 cubic inches; one cubic foot holds 7.48 gallons and weighs 62.4 pounds.
- Air gap definition
- The unobstructed vertical distance through free air between a water supply outlet and the flood level rim of the receiving fixture, giving the highest level of backflow protection available.
- Reduced pressure zone assembly
- A testable backflow preventer containing two check valves and a differential relief valve that protects against both backsiphonage and backpressure, and requires annual certified testing.
- Water hammer arrestor
- A device containing a trapped air chamber or spring-loaded piston, installed near quick-closing valves to absorb the pressure surge produced when flow stops suddenly.
- Trench protection threshold
- Excavations 5 feet deep or more require sloping, shoring, or a trench box, and a competent person must classify the soil and inspect the excavation daily.
- Maximum pipe velocity
- Water piping is sized so velocity does not exceed about 8 feet per second in cold water lines or about 5 feet per second in hot water lines.
- Pressure reducing valve
- A device installed on the building service when street pressure exceeds 80 psi, reducing it to a usable range, typically about 50 to 60 psi.
- Water supply fixture units
- A weighted value assigned to each fixture based on its flow demand; values are summed along a branch and converted to probable gpm demand by table.
- Frost depth burial
- Water service pipe must be buried below the local frost line, which in Wisconsin ranges from roughly 3.5 feet in the south to about 6 feet in the north.
- Residual flow pressure
- The pressure remaining at a fixture while water is flowing; code tables set a minimum for each fixture type, commonly in the range of 8 to 20 psi.
- Service shutoff valve
- A full-flow valve installed on the water service near the point of entry so the entire building supply can be shut off for repairs or emergencies.
- Horizontal drain slope
- Horizontal drainage pipe 2-1/2 inches and smaller must slope at 1/4 inch per foot; pipe 3 inches and larger must slope at 1/8 inch per foot.
- Trap seal depth
- A trap must hold a liquid seal between 2 and 4 inches deep, and the vertical drop from the fixture outlet to the trap weir cannot exceed 24 inches.
- Trap arm length limit
- The developed length from trap weir to vent fitting is limited by pipe size, from 5 feet for 1-1/4 inch pipe up to 16 feet for 4 inch pipe.
- Vent terminal location
- A vent must terminate at least 6 inches above the roof, at least 3 feet from operable windows and doors, and at least 10 feet from outdoor air intakes.
- Cleanout placement
- Cleanouts are required at the base of each stack, at the building sewer, at 100 foot intervals along horizontal runs, and at changes of direction greater than 45 degrees.
- Wet vent
- A single pipe that serves both as the vent for one fixture and as the drain for another fixture discharging downstream of it, sized by table.
- Prohibited S-trap
- A trap with a horizontal outlet on the same plane as its inlet; it self-siphons and loses its seal, so the code prohibits it.
- Water closet clearance
- A water closet requires at least 15 inches from its centerline to any side wall or partition and at least 21 inches of clear space in front of the bowl.
- Water closet fixture units
- A 1.6 gallon per flush tank-type water closet is rated at 3 water supply fixture units and 4 drainage fixture units in standard tables.
- T&P relief valve
- Required on every water heater, set at or below the tank rating, installed in the top 6 inches, with a full-size discharge ending 6 to 24 inches above the floor.
- Dishwasher drain protection
- The dishwasher discharge must pass through an air gap or a high loop fastened under the counter before it connects to the sink drain or disposer.
- Floor drain trap primer
- A device that automatically adds water to a floor drain trap to replace evaporation, keeping the required 2 to 4 inch seal intact between uses.
- Accessible water closet height
- An accessible water closet has its bowl rim 17 to 19 inches above the floor and its centerline 16 to 18 inches from the side wall.
- Indirect waste receptor
- A fixture that receives liquid waste discharged through an air gap from appliances such as ice machines, sterilizers, or dishwashing equipment, never by direct connection.
- SPS 382
- The Wisconsin Administrative Code chapter that governs the design, construction, installation, and inspection of plumbing systems in buildings and on premises.
- Rough-in inspection
- An inspection performed after piping is installed and tested but before the work is concealed by framing, insulation, or finished surfaces.
- Plumbing permit requirement
- A permit must be obtained before installing, altering, or replacing plumbing piping, fixtures, or appliances, except for minor repairs the code specifically exempts.
- Annual RPZ testing
- Reduced pressure zone backflow assemblies must be tested at least once each year by a certified tester, with results reported to the water utility.
- POWTS permit
- A private onsite wastewater treatment system requires a soil evaluation and a state or county permit before it may be installed or replaced.
- Master plumber license
- The credential required in Wisconsin to obtain plumbing permits, contract for plumbing work, and supervise journeymen and apprentices on the job.