ASSE 5150 flashcards

32 cards. Read the term and the definition here. The deck at the top of this page is optional.

Fixture unit (FU)

A dimensionless measure of the probable load a fixture places on the drainage or water supply system; 1 FU equals 1 cubic foot per minute (cfm) of drainage flow or 1 gallon per minute (gpm) of water supply.

Building drain

The lowest piping of a drainage system that receives the discharge from soil, waste, and other drainage pipes inside the walls of the building and conveys it to the building sewer.

Building sewer

The extension from the building drain to the public sewer or other place of disposal; it begins at the building foundation and runs to the public sewer or private disposal system.

Minimum water service size

The smallest allowable diameter for a building water service is 3/4 inch, unless a larger size is required to deliver the peak demand at the minimum residual pressure.

Residual pressure

The pressure remaining in the water distribution system at the highest fixture while the system is delivering the peak demand; the code requires at least 8 psi at the highest fixture.

Pressure-reducing valve

A device that reduces the incoming water pressure to a safe level; it is required when the static pressure exceeds 80 psi to prevent damage to fixtures and piping.

Drainage slope

The slope of a horizontal drainage pipe must be at least 1/4 inch per foot for pipe sizes 2 inches and smaller, and at least 1/8 inch per foot for pipe sizes 3 inches and larger.

Trap arm length

The maximum developed length of a trap arm is based on the pipe diameter: 1-1/2 inch = 6 feet, 2 inch = 8 feet, 3 inch = 12 feet, and 4 inch = 16 feet.

Vent terminal height

A vent stack must extend at least 6 inches above the roof and at least 12 inches above any roof surface used for other purposes; the vent terminal must be at least 10 feet from any lot line, opening, or air intake.

Cleanout spacing

A cleanout must be installed at the base of each soil stack, at the building drain, and at intervals not exceeding 100 feet in horizontal drainage pipes; cleanouts must be accessible.

Water closet flush volume

The minimum water closet flush volume is 1.6 gallons per flush; the minimum urinal flush volume is 1.0 gallon per flush; the minimum showerhead flow rate is 2.5 gallons per minute at 80 psi.

Water heater relief valve

A temperature and pressure relief valve must be installed on the water heater; the relief valve must be piped to a safe location and must not be connected to the drainage system without an air gap.

Trap seal depth

The trap seal must be at least 2 inches and not more than 4 inches deep; the trap must be of the same size as the fixture drain.

Fixture clearance

The minimum clearance between a fixture and a wall or partition is 15 inches from the centerline of the fixture to the wall; the minimum clearance between two fixtures is 30 inches center-to-center.

Cross-connection

Any actual or potential connection between a potable water system and any nonpotable source; backflow is the reversal of flow in a water system.

Backsiphonage

Backflow caused by negative pressure in the supply system; it can occur when a water main breaks or when a large volume of water is drawn from the system.

Air gap

The most effective backflow prevention device; it must be at least twice the diameter of the supply pipe and never less than 1 inch.

RPZ backflow preventer

A reduced pressure principle backflow preventer is required for high-hazard applications; it consists of two independently acting check valves and a differential pressure relief valve.

Double check valve assembly

A double check valve assembly (DCVA) is used for low-hazard applications; it consists of two independently acting check valves and must be tested annually.

Atmospheric vacuum breaker

An atmospheric vacuum breaker (AVB) must be installed at least 6 inches above the highest downstream outlet; it cannot be used under continuous pressure.

Water distribution test

The water distribution system must be tested at a pressure of at least 100 psi for at least 60 minutes; the pressure must not drop more than 5 psi during the test.

Drainage air test

The air test for the drainage system must be conducted at a pressure of at least 5 psi for at least 15 minutes; the pressure must not drop more than 1 psi during the test.

Final inspection

The final inspection must be conducted after all plumbing work is complete and before the system is placed in operation; it verifies that all fixtures, appurtenances, and devices are installed in accordance with the approved plans.

Plan review

Plan review must verify that the plumbing system complies with the code; the review must include the sizing of the water supply and drainage systems, the venting system, and the backflow prevention devices.

Plumbing permit

A plumbing permit is required for the installation, alteration, repair, or replacement of a plumbing system; minor repairs and replacement of fixtures may be exempted by the authority having jurisdiction.

Permit validity period

The permit is valid for a period of 180 days from the date of issuance; the permit may be extended for an additional 180 days upon written request.

Certificate of occupancy

A certificate of occupancy must not be issued until the plumbing system has passed the final inspection; the certificate of occupancy is required before the building may be occupied.

Stop-work order

The code official may issue a stop-work order if the work is being performed in violation of the code; the stop-work order must be in writing and must state the reason for the order.

Water and sewer separation

The minimum distance between a water service pipe and a sewer pipe is 10 feet horizontally or 18 inches vertically; the water pipe must be above the sewer pipe if the vertical separation is less than 18 inches.

Grease interceptor size

The minimum size of a grease interceptor is 10 gallons per minute for a single-compartment sink; the grease interceptor must be installed downstream of all fixtures that discharge grease.

Medical gas pipe

The minimum size of a medical gas pipe is 1/2 inch; the pipe must be installed by a certified installer and must be tested in accordance with NFPA 99.

Fuel gas pipe test

The minimum size of a fuel gas pipe is 1/2 inch; the pipe must be installed in accordance with the fuel gas code and must be tested at a pressure of at least 1.5 times the maximum working pressure.