Water supply sizing, pressure requirements, and distribution system rules tested on plumbing licensing exams.
30 cards · basic cards · AI-written, checked twice. Edit anything.
- What is the minimum water pressure at a fixture outlet according to code?
- 20 psi
- What is the maximum static water pressure before a pressure reducer is required?
- 80 psi
- Define a fixture unit in plumbing.
- A standardized measure of the water demand and drainage load of a plumbing fixture
- How is water demand calculated for a building's supply system?
- By converting all fixtures to fixture units and consulting demand tables
- What is the purpose of a backflow preventer?
- To prevent contaminated water from flowing backward into the potable water supply
- What device reduces high water pressure in a supply line?
- Pressure regulator or pressure reducing valve
- When is a backflow preventer required at the building entrance?
- When internal system pressure exceeds 80 psi or as required by local code
- What is the minimum hot water temperature supplied to fixtures?
- 110 degrees Fahrenheit
- What is the maximum temperature of hot water delivered to prevent scalding?
- 120 degrees Fahrenheit
- What is an expansion tank used for in a water system?
- To accommodate water expansion from heating and prevent excessive pressure buildup
- What type of valve only allows water to flow in one direction?
- Check valve
- Define residual pressure in a water distribution system.
- The water pressure at a fixture while water is actively flowing out
- What is static pressure in a water system?
- Water pressure in the system when no water is flowing
- What is the purpose of a water meter in the supply system?
- To measure and record the volume of water consumption
- What is a water service line?
- The supply pipe connecting the public water main to the building entrance
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