OBC Plumbing All Buildings flashcards
OBC Plumbing All Buildings · 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.
- Authority Having Jurisdiction (AHJ)
- The organization, office, or individual responsible for enforcing the code, approving materials and methods, and issuing permits and certificates of approval.
- Plumbing Fixture
- A receptacle that receives water or waste and discharges it to the drainage system, such as a sink, water closet, bathtub, or drinking fountain.
- Trap
- A fitting that retains a water seal to prevent sewer gas from entering a building, with a seal depth of at least 2 inches and not more than 4 inches.
- Drainage Fixture Unit (dfu)
- A measure of the probable discharge load of a fixture, used to size drainage piping and to determine the required slope and diameter.
- Vent Stack
- A vertical pipe that provides air to the drainage system and extends through the roof to equalize pressure and protect trap seals.
- Wet Vent
- A vent that also serves as a drain for one or two fixtures, sized to carry both the waste and vent load, and installed according to code limits.
- Cleanout
- An accessible fitting with a removable plug that allows access to the drainage system for clearing stoppages, required at intervals and at changes in direction.
- Backflow Prevention Device
- An approved device or assembly that prevents the reverse flow of water from a nonpotable source into the potable water system.
- Air Gap
- The unobstructed vertical distance between the lowest opening of a water supply outlet and the flood-level rim of a fixture, used to prevent backflow.
- Water Supply System
- All piping, fixtures, and fittings that convey water from the source to the point of use, sized to provide adequate flow and pressure.
- Building Sewer
- The pipe that connects the building drainage system to the public sewer or private disposal system, installed with watertight joints.
- Grease Interceptor
- A device installed in the drainage system to separate and retain grease and oils from wastewater before discharge to the sewer.
- Acid Waste System
- A special plumbing system with acid-resistant piping that neutralizes corrosive wastes before discharge to the sewer, required in laboratories and similar occupancies.
- Storm Drainage System
- A system of pipes, roof drains, and fittings that conveys rainwater and surface water to an approved discharge point, separate from sanitary drainage.
- Roof Drain
- A drain installed at a low point of a roof to collect rainwater, provided with a strainer and sized based on roof area and rainfall intensity.
- Accessible Fixture
- A plumbing fixture designed and installed to be usable by persons with disabilities, with clear floor space, grab bars, and operable controls.
- Grab Bar
- A bar installed in accessible bathrooms to provide support and stability for persons with disabilities, required at water closets, showers, and bathtubs.
- Pressure-Balancing Valve
- A shower valve that maintains a constant water temperature by balancing hot and cold water pressures, preventing scalding.
- Flushometer Valve
- A valve that uses water line pressure to flush a water closet or urinal, requiring a minimum residual pressure of 8 psi at the fixture.
- Water Closet
- A plumbing fixture that receives human waste and flushes it to the drainage system, with a maximum water consumption of 1.6 gallons per flush.
- Urinal
- A plumbing fixture for urination that is flushed with water, with a maximum water consumption of 1.0 gallon per flush.
- Shower Compartment
- An enclosure for showering with a minimum interior area of 900 square inches and a minimum dimension of 30 inches, with a slip-resistant surface.
- Drainage Slope
- The uniform fall of a horizontal drainage pipe, typically 1/4 inch per foot for pipes 2.5 inches and smaller, and 1/8 inch per foot for larger pipes.
- Sanitary Tee
- A fitting used to connect a branch to a vertical drain, not permitted for horizontal-to-horizontal connections because it can cause stoppages.
- Vent Terminal
- The open end of a vent pipe that extends above the roof, required to be at least 6 inches above the roof and 10 feet from air intakes.
- Air Admittance Valve
- A one-way valve that allows air to enter the drainage system to protect trap seals, used where approved and installed per manufacturer instructions.
- Residual Pressure
- The minimum water pressure required at a fixture for proper operation, such as 8 psi for flushometer valves and 15 psi for other fixtures.
- Cross-Connection
- A connection between a potable water system and a nonpotable source that could allow contamination, requiring an approved backflow prevention device.
- Temperature and Pressure Relief Valve
- A safety device installed on water heaters that opens to release excess temperature or pressure, preventing explosion.
- Oil Interceptor
- A device installed in the drainage system to separate and retain oil and grease from wastewater, required in garages and similar areas.
- Sand Interceptor
- A device installed in the drainage system to separate and retain sand and heavy solids from wastewater before discharge to the sewer.
- Drainage System Test
- A test of the drainage system with water or air at a pressure of at least 5 psi for at least 15 minutes, witnessed by the AHJ before concealment.