NITC Journey Level Plumber flashcards
NITC Journey Level 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.
- Building drain
- The lowest piping of a drainage system that receives the discharge from soil, waste, and other drainage pipes inside the walls and conveys it to the building sewer.
- Building sewer
- The pipe that conveys sewage from the building drain to the public sewer or private sewage disposal system, beginning outside the building wall.
- Trap seal depth
- The vertical distance between the crown weir of the trap and the top of the trap dip, typically a minimum of 2 inches and a maximum of 4 inches.
- Wet vent
- A vent that also serves as a drain for one or more fixtures, receiving drainage from fixtures while providing air to the drainage system.
- Air admittance valve
- A one-way valve that admits air into the drainage system to equalize pressure but does not allow sewer gas to escape into the building.
- Drainage slope
- The fall of drainage piping per unit of length, typically 1/4 inch per foot for pipe 2.5 inches and smaller and 1/8 inch per foot for larger pipe.
- Fixture unit
- A measure of the load-producing effect of a fixture on the drainage or water supply system, used to size piping and vents.
- Water closet
- A fixture that receives human waste and discharges it to the drainage system through a trap; typically rated at 1.6 gallons per flush maximum.
- TPR valve
- A temperature and pressure relief valve on a water heater that discharges to a safe point, typically within 6 inches of the floor, with no downstream valve.
- Air gap
- The unobstructed vertical distance between the lowest opening of a water supply outlet and the flood-level rim of a fixture or receptacle; the highest level of backflow protection.
- Reduced-pressure-zone assembly
- A backflow prevention device with two independently acting check valves and a differential relief valve, providing protection for high-hazard cross-connections.
- Confined space
- A space large enough for entry, with limited means of entry or exit, and not designed for continuous occupancy; entry requires atmospheric testing and monitoring.
- Lockout/tagout
- A procedure that de-energizes equipment, applies a lock and tag, releases stored energy, and verifies isolation before maintenance or repair.
- Dielectric union
- A fitting that separates dissimilar metals, such as copper and steel, to prevent galvanic corrosion in piping systems.
- PEX
- Cross-linked polyethylene tubing joined with insert fittings and crimp or clamp rings; it cannot be solvent cemented and must be protected from UV exposure.
- CPVC
- Chlorinated polyvinyl chloride piping joined with solvent cement rated for CPVC; it is used for hot and cold potable water distribution.
- Brazing
- A copper joining method using filler metal that melts above 840 degrees Fahrenheit, producing a stronger joint than soldering for high-pressure applications.
- Nominal pipe size
- A dimensionless designation for pipe that approximates inside diameter for standard-weight steel pipe; schedule number indicates wall thickness.
- Service line
- The pipe that conveys water from the public water main or private source to the building; typically a minimum of 3/4 inch for a single-family dwelling.
- Pressure-reducing valve
- A device that reduces incoming water pressure to a safe level, typically required when the supply pressure exceeds 80 psi.
- Water hammer arrestor
- A device that absorbs hydraulic shock caused by sudden valve closure, installed near the fixture or appliance that causes the shock.
- Hunter curve
- A published relationship that converts fixture units to probable water demand in gallons per minute for sizing water supply piping.
- Isometric drawing
- A three-dimensional drawing showing piping along axes at 30, 90, and 150 degrees; vertical pipes are drawn vertically and horizontal runs at 30 degrees.
- Pipe slope formula
- Total fall equals pipe length multiplied by slope; a 40-foot run at 1/4 inch per foot falls 10 inches.
- Drawing scale
- The ratio of drawing distance to actual distance; a scale of 1/4 inch = 1 foot means 1 inch on the drawing equals 4 feet in reality.
- Rough-in inspection
- An inspection that verifies piping installation before concealment, conducted after rough piping is installed and before walls, floors, or ceilings are closed.
- Hydrostatic test
- A test of the drainage system conducted by filling the system with water and holding it for a specified period, typically 15 minutes to 1 hour, with no drop in level.
- Uniform Plumbing Code
- A model plumbing code adopted and amended by local jurisdictions, covering installation, materials, fixtures, and inspection requirements.
- Running toilet cause
- A toilet that runs continuously is most commonly caused by a faulty flapper, a worn fill valve, or a misadjusted float.
- Frozen pipe thawing
- Thawing is done by applying heat gradually from the fixture end toward the frozen section, never with an open flame, and the pipe is inspected for cracks afterward.
- Sewer odor diagnosis
- A sewer odor indoors is commonly caused by a dry trap, a broken vent, or a failed wax ring; the trap seal and vent system are inspected first.
- Low water pressure cause
- Low pressure may result from a partially closed valve, a clogged aerator, or a failing pressure-reducing valve; static and residual pressure are measured to diagnose.