Piping Basics of Piping 2

Question 1

What does the term 'nominal pipe size' (NPS) refer to?

Accepted Answer

A standardized designation that loosely correlates to pipe dimensions

Answer

NPS is a North American standard designation that does not directly equal the actual outer or inner diameter but serves as a reference for pipe and fitting compatibility.

Question 2

Which piping schedule number indicates the thickest wall for a given NPS?

Accepted Answer

Schedule 160

Answer

Schedule 160 has the thickest wall among common schedules, resulting in the smallest inner diameter and highest pressure rating for the same nominal size.

Question 3

What is the primary purpose of a pipe reducer in a piping system?

Accepted Answer

To connect pipes of different diameters

Answer

A reducer is a fitting used to connect two pipes of different sizes, transitioning the flow from a larger to a smaller diameter or vice versa.

Question 4

Which type of pipe joint uses a tapered thread to create a pressure-tight seal?

Accepted Answer

NPT threaded joint

Answer

National Pipe Taper (NPT) threads are designed with a slight taper so that mating threads wedge together, forming a seal that tightens under pressure.

Question 5

What is the function of a check valve in a piping system?

Accepted Answer

Allow flow in one direction only

Answer

A check valve automatically prevents backflow by allowing fluid to pass in only one direction, protecting pumps and other equipment from reverse flow.

Piping Practice Test

Piping Practice Test

Piping Basics of Piping 2