NH Journeyman Plumber flashcards
NH Journeyman 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 probable load used to size water supply and drainage systems; one fixture unit approximates one cubic foot per minute of drainage flow.
- Trap seal depth
- The vertical distance between the crown weir of a trap and the dip of the trap seal; must be at least 2 inches and not more than 4 inches.
- Developed length
- The total length of a piping run including the straight pipe plus equivalent lengths added for fittings, valves, and bends when sizing pipe.
- Air gap
- The unobstructed vertical distance between the lowest opening of a water supply outlet and the flood-level rim of a fixture; minimum 1 inch.
- Reduced pressure zone assembly
- A testable backflow preventer with two check valves and a relief valve; used for high-hazard cross-connections and requires annual testing.
- Water closet flush limit
- The maximum allowable flush volume for a water closet is 1.6 gallons per flush; high-efficiency models use 1.28 gallons or less.
- Water closet clearance
- A water closet must have at least 15 inches from its centerline to any side wall and at least 30 inches of clear width.
- Showerhead flow limit
- The maximum flow rate for a showerhead is 2.5 gallons per minute at 80 psi; multiple outlets are counted together.
- Floor drain trap primer
- A device that automatically adds water to a floor drain trap to maintain its seal where the drain is used infrequently.
- Waterless urinal cartridge
- A sealed cartridge containing a barrier liquid that replaces the water trap seal in a waterless urinal and blocks sewer gas.
- Lavatory faucet flow
- The maximum flow rate for a lavatory faucet is 2.2 gallons per minute; public lavatory faucets are limited to 0.5 gallons per minute.
- Temperature and pressure relief valve
- A safety valve on a storage water heater that opens at a set temperature or pressure; setpoint must not exceed 210°F or 150 psi.
- T&P discharge pipe
- The pipe from a temperature and pressure relief valve must be full size, gravity-drained, and terminate not more than 6 inches above the floor.
- Thermal expansion tank
- A tank installed on a closed water supply system to absorb the volume increase caused by heating water and prevent pressure buildup.
- FVIR water heater
- A flammable vapor ignition resistant water heater; its ignition source is designed to resist ignition of flammable vapors near the floor.
- Water heater drain pan
- A pan at least 1.5 inches deep installed under a water heater where leakage could cause damage; it must drain by gravity or a listed pump.
- Combustion air openings
- Two permanent openings to outdoors sized at 1 square inch per 4,000 Btu/hr of total appliance input, or 50 cubic feet per 1,000 Btu/hr indoors.
- Maximum fixture pressure
- The static pressure at any fixture must not exceed 80 psi; a pressure-reducing valve is required where street pressure exceeds that value.
- Flushometer minimum pressure
- A minimum of 15 psi flowing pressure is required at a flushometer valve; flush tanks require at least 8 psi.
- Frost depth
- The depth to which soil freezes in winter; water service pipe must be buried below this depth, typically 4 to 5 feet in New Hampshire.
- Water service pipe
- The pipe from the water main or source of supply to the building served; it must be buried below frost depth and protected from damage.
- Recirculation system
- A hot water distribution arrangement that returns cooled water to the heater, reducing wait time and water waste at fixtures.
- Trap arm length
- The distance from a fixture trap to its vent; limited by pipe size, for example 6 feet for 1-1/2 inch pipe and 8 feet for 2 inch pipe.
- Vent terminal height
- A vent stack must extend at least 6 inches above the roof, or 12 inches where the roof is used for purposes other than weather protection.
- Building drain
- The lowest piping that receives discharge from soil and waste stacks inside the building and connects to the building sewer at least 2 feet outside the foundation.
- Cleanout spacing
- Cleanouts are required at the base of each soil or waste stack, at the building drain, and at intervals not exceeding 100 feet in horizontal runs.
- Backwater valve
- A device installed on a drainage line to prevent sewage backflow; required where fixtures are below the elevation of the next upstream manhole.
- Storm drainage separation
- Roof and area drains must connect to a storm system separate from the sanitary sewer unless the local system is a combined sewer.
- Sediment trap
- A drip leg installed at a gas appliance downstream of the shutoff valve to collect debris and moisture before they reach the controls.
- Gas piping test pressure
- Low-pressure gas piping is tested at 1.5 times working pressure but not less than 3 psi for at least 10 minutes before inspection.
- Appliance connector
- A flexible or semirigid gas connector not exceeding 6 feet that must not pass through walls or floors and must not be concealed.
- New Hampshire plumbing license
- Plumbing work in New Hampshire requires a license issued by the Office of Professional Licensure and Certification under RSA 329-A.