Pipe Systems & Materials Flashcards
6 cards from real Plumbing practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Pipe Systems & Materials flashcards as text
What is the nominal pipe size (NPS) measurement based on?
Answer: Approximate inner diameter
Nominal pipe size (NPS) is an approximate measurement of the inner diameter, not an exact measurement of any physical dimension.
Which pipe material is best suited for underground sewer lines due to its chemical resistance?
Answer: Schedule 40 PVC
Schedule 40 PVC is widely used for underground sewer lines because of its excellent chemical resistance and durability in soil environments.
What does 'Schedule' refer to in pipe specifications (e.g., Schedule 40)?
Answer: The pipe's wall thickness
Schedule refers to the wall thickness of a pipe, with higher schedule numbers indicating thicker walls and greater pressure ratings.
Which type of copper pipe has the thinnest wall and is used for interior supply lines?
Answer: Type M
Type M copper has the thinnest walls among the three pressure-rated copper types and is commonly used for interior supply lines in residential applications.
What is the purpose of a dielectric union?
Answer: To prevent galvanic corrosion between dissimilar metals
A dielectric union prevents galvanic corrosion by electrically isolating two dissimilar metal pipes, such as copper and galvanized steel.
What is the maximum operating temperature for standard PVC pipe?
Answer: 140°F
Standard PVC pipe has a maximum operating temperature of 140°F (60°C), which is why it cannot be used for hot water supply lines.