Piping Basics of Piping 4

Question 1

Which type of valve provides the best flow control due to its variable orifice opening?

Accepted Answer

Globe valve

Answer

Globe valves are designed for throttling because the disc and seat geometry allows precise, gradual flow regulation across a wide range of positions.

Question 2

What is the significance of pipe 'schedule' in conjunction with nominal pipe size?

Accepted Answer

It defines the wall thickness relative to the pipe diameter

Answer

The schedule number, combined with NPS, mathematically determines the wall thickness of the pipe, which in turn affects pressure rating and flow capacity.

Question 3

In which situation would an engineer specify a butt-weld fitting over a socket-weld fitting?

Accepted Answer

For pipes 2 inches and larger requiring full-penetration welds

Answer

Butt-weld fittings are used on larger diameter pipes (typically 2 NPS and above) where a full-penetration weld provides the strength and leak-free joint needed for high-pressure or critical service.

Question 4

What does 'MAWP' stand for in piping and pressure vessel terminology?

Accepted Answer

Maximum Allowable Working Pressure

Answer

MAWP is the Maximum Allowable Working Pressure — the highest pressure at which a piping system or vessel may be continuously operated under normal conditions.

Question 5

Why is galvanized steel pipe NOT recommended for natural gas service?

Accepted Answer

Zinc flakes can clog gas appliance orifices and regulators

Answer

The zinc coating on galvanized pipe can flake off over time, and those particles can block gas regulators, valves, and appliance orifices, creating a safety hazard.

Piping Practice Test

Piping Practice Test

Piping Basics of Piping 4