LA Plumber flashcards
LA 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.
- Fixture unit (FU)
- A unit that expresses the load-producing effect of a fixture on the drainage or water supply system, allowing dissimilar fixtures to be added into one total design load.
- Drainage fixture units
- Total DFU in a building determine the minimum building drain and building sewer size using the code sizing table, not the simple sum of pipe areas.
- Static pressure loss per foot
- Each foot of elevation gain reduces water pressure by about 0.433 psi, because one psi equals 2.31 feet of head in a column of water.
- Trap seal depth
- The water seal in a fixture trap must be between 2 and 4 inches deep; a seal outside this range can be siphoned or allow sewer gas to pass.
- Vent terminal height
- A vent stack must extend at least 6 inches above the roof, or 12 inches above a roof used for other purposes, and 10 feet from air intakes.
- Cleanout location
- Cleanouts are required at the base of each stack, at the building drain, at direction changes over 45 degrees, and at intervals not exceeding 100 feet.
- Air gap
- The only absolute backflow protection: an unobstructed vertical distance of at least twice the supply pipe diameter and never less than 1 inch above the flood rim.
- RPZ assembly
- A reduced pressure zone backflow preventer is required for high-hazard connections and must be tested annually by a certified tester.
- Hydrostatic test
- The standard DWV test: fill the system with water to at least 10 feet of head above the highest fitting and hold for 15 minutes before inspection.
- Trench protective system
- Any excavation 5 feet or deeper requires sloping, shoring, or a trench box, and spoil piles must be kept at least 2 feet from the edge.
- Copper tube types
- Type K is thickest and used underground, Type L is standard and most common, Type M is thin wall and permitted aboveground only.
- Water piping test pressure
- Water supply piping is tested at 50 psi or working pressure, whichever is greater, for at least 60 minutes with no pressure drop.
- T&P relief discharge
- A water heater temperature and pressure relief valve must discharge full size, terminate within 6 inches of the floor, and never be trapped or reduced.
- Gas piping test
- Gas piping is tested with air or inert gas at 10 psi for at least 30 minutes for systems up to 125 psi working pressure, witnessed by the code official.
- Sediment trap
- A sediment trap is required at the appliance connection on gas piping to catch debris before it reaches the appliance controls.
- Building sewer minimum size
- A building sewer serving a building with water closets must be at least 4 inches; a building without water closets may use 3 inches.
- Sewer cleanout spacing
- Sewer cleanouts are required at the property line, at the building sewer, and at intervals not exceeding 100 feet, with gas-tight covers.
- Roof drain sizing
- Roof drain size depends on roof area, the local 100-year one-hour rainfall intensity, and the drain size, using the code sizing table.
- Backwater valve
- A backwater valve is required where the building drain is below the level of the public sewer or where the sewer may surcharge, and must be accessible.
- Permit expiration
- A plumbing permit expires if work does not start within 180 days of issuance or is suspended for 180 days; a new permit and fee are then required.
- Rough-in inspection
- The rough-in inspection must be approved before any DWV or water piping is concealed, and the code official must be given notice to schedule it.
- Stop-work order
- The code official may issue a stop-work order for unpermitted or unsafe work, and work may not resume until the order is lifted.
- Water closet clearance
- A water closet needs at least 15 inches from centerline to side wall and 21 inches in front of the bowl for code-compliant clearance.
- Clothes washer standpipe
- A clothes washer requires a 2-inch standpipe with a trap and 2-inch vent, between 18 and 42 inches above the floor.
- Dishwasher drain connection
- A dishwasher must drain through an air gap or high-loop connection to prevent backflow, discharging to the sink drain or a separate trap.
- Floor drain trap primer
- A floor drain trap needs a minimum 2-inch seal and a trap primer where the trap may evaporate, plus a strainer at the outlet.
- Water service cover
- Buried water service pipe must have at least 12 inches of cover below the frost line, or the local depth requirement, typically 18 to 24 inches in Louisiana.
- Water hammer arrestor
- A water hammer arrestor is required at quick-closing valves and at the end of long runs to absorb pressure surges and protect the piping.
- Pressure vacuum breaker
- A pressure vacuum breaker is used for lawn irrigation and must be installed at least 12 inches above the highest downstream outlet.
- Hose bibb vacuum breaker
- A listed hose bibb vacuum breaker is required on all sill cocks and hose connections and must not be removed by the user.
- Call 811 before digging
- Before excavating, call 811 to locate underground utilities, wait the required time, and hand-dig within 24 inches of marked utilities.
- Confined space entry
- Entry into excavations deeper than 4 feet, tanks, or vaults requires atmospheric testing for oxygen, flammable gas, and hydrogen sulfide before and during entry.