AK Plumber flashcards
AK 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 of measure representing the probable load a plumbing fixture places on the drainage or water supply system, used to size piping.
- Developed length
- The total length of pipe measured along its centerline plus equivalent lengths for fittings and valves, used in sizing calculations.
- Building drain
- The lowest piping of a drainage system that receives discharge from soil and waste stacks and conveys it to the building sewer.
- Building sewer
- The pipe that conveys sewage from the building drain to the public sewer or private disposal system, starting outside the building wall.
- Trap seal depth
- The vertical distance between the crown weir of a trap and the top of the water seal, which must be 2 to 4 inches.
- Vent stack termination
- A vent must extend at least 6 inches above the roof and be located away from windows and air intakes to prevent odor entry.
- Wet vent
- A single pipe that serves as both a drain for one fixture and a vent for another, permitted only under code-specified conditions.
- Cleanout requirement
- An accessible fitting with a removable plug installed at the base of stacks, building drains, and at large changes of direction for clearing stoppages.
- Backwater valve
- A device installed on a drainage line to prevent sewage from reversing into the building when the public sewer surcharges.
- Grease interceptor
- A tank that separates and retains fats, oils, and grease from wastewater before it enters the sanitary sewer, required for commercial kitchens.
- Air gap
- The unobstructed vertical distance between a water supply outlet and the flood-level rim of a receptacle; the most reliable backflow prevention.
- Pressure-reducing valve
- A device installed on a water service to lower incoming pressure to a safe level when system pressure exceeds the code maximum.
- Water hammer arrestor
- A device with a trapped air chamber installed near quick-closing valves to absorb hydraulic shock and prevent pipe noise and damage.
- T&P relief valve
- A temperature and pressure relief valve that opens to discharge water when the heater exceeds its rated temperature or pressure limits.
- Expansion tank
- A tank installed in a closed water system to absorb the increased volume caused by thermal expansion and protect the system.
- Sediment trap
- A fitting installed on a gas line ahead of an appliance's controls to catch dirt and debris and protect the gas valve.
- Combustion air opening
- A permanent opening supplying air to an appliance; indoor air openings require 1 sq in. per 1,000 Btu/h of input.
- Longest run method
- A gas pipe sizing method that measures the longest path from the meter to the farthest appliance to select pipe size from capacity tables.
- Flood-level rim
- The edge of a fixture over which water would overflow onto the floor; it determines required backwater and air gap protection.
- Fixture clearance
- The minimum free space required around a fixture, such as 15 inches from a water closet centerline to a side wall.
- Standpipe
- A vertical pipe that receives the discharge from an appliance such as a clothes washer and connects to a trapped drain.
- Roof drain
- A drain installed on a roof to collect storm water and convey it to a storm drainage system, separate from the sanitary sewer.
- Storm drainage separation
- The rule that storm water from roofs, yards, and foundations must not connect to the sanitary sewer system.
- Permit requirement
- A permit must be obtained from the authority having jurisdiction before installing or altering plumbing, with minor repairs exempt.
- Authority having jurisdiction
- The official or agency responsible for enforcing the plumbing code and approving installations, materials, and inspections.
- Rough-in inspection
- An inspection performed after piping is installed but before it is concealed, to verify code compliance of drains, vents, and supplies.
- Slope conversion
- A 1/4 inch per foot slope equals about 2.08 percent grade, calculated as rise divided by run times 100.
- Trench protection
- Excavations 5 feet or deeper require shoring, sloping, or shielding, and a competent person must inspect the trench daily.
- Confined space entry
- Entry into tanks, vaults, or sewers requires atmospheric testing, ventilation, and a trained attendant standing by outside.
- Utility locating
- The practice of calling the locating service before digging to mark underground utilities and prevent strikes and injuries.
- Water service burial depth
- A water service pipe must be buried below the local frost line to prevent freezing and loss of service.
- Drainage pipe support
- Horizontal drainage piping must be supported at intervals not exceeding 4 feet, and vertical stacks at each floor.