Plumbing Pipe Systems & Materials 2

Question 1

What is the nominal pipe size (NPS) measurement based on?

Accepted Answer

Approximate inner diameter

Answer

Nominal pipe size (NPS) is an approximate measurement of the inner diameter, not an exact measurement of any physical dimension.

Question 2

Which pipe material is best suited for underground sewer lines due to its chemical resistance?

Accepted Answer

Schedule 40 PVC

Answer

Schedule 40 PVC is widely used for underground sewer lines because of its excellent chemical resistance and durability in soil environments.

Question 3

What does 'Schedule' refer to in pipe specifications (e.g., Schedule 40)?

Accepted Answer

The pipe's wall thickness

Answer

Schedule refers to the wall thickness of a pipe, with higher schedule numbers indicating thicker walls and greater pressure ratings.

Question 4

Which type of copper pipe has the thinnest wall and is used for interior supply lines?

Accepted Answer

Type M

Answer

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.

Question 5

What is the purpose of a dielectric union?

Accepted Answer

To prevent galvanic corrosion between dissimilar metals

Answer

A dielectric union prevents galvanic corrosion by electrically isolating two dissimilar metal pipes, such as copper and galvanized steel.

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Plumbing Pipe Systems & Materials 2