Steamfitter Pipe Systems and Materials 2

Question 1

What is the function of a reducing coupling in a piping system?

Accepted Answer

To connect pipes of two different diameters in a straight run

Answer

A reducing coupling joins two pipes of different sizes in line, allowing a transition from a larger to a smaller (or smaller to larger) pipe diameter.

Question 2

What type of pipe thread standard is most commonly specified for threaded connections in U.S. steam and water piping systems?

Accepted Answer

NPT (National Pipe Taper)

Answer

NPT (National Pipe Taper) is the US standard for threaded pipe connections; the tapered threads create a pressure-tight seal when engaged and assembled with thread sealant.

Question 3

A concentric reducer is different from an eccentric reducer in that a concentric reducer:

Accepted Answer

Keeps the pipe centerlines aligned on the same axis

Answer

A concentric reducer maintains the same centerline for both pipes, while an eccentric reducer offsets one side flat, which is preferred on horizontal lines to prevent air or condensate pocketing.

Question 4

Which type of valve is best suited for throttling or regulating flow in a steam piping system?

Accepted Answer

Globe valve

Answer

Globe valves are specifically designed for throttling because their plug-and-seat design provides fine flow control; gate and ball valves are intended for full-open or full-closed service only.

Question 5

What is the primary advantage of a flanged connection compared to a threaded connection in a large-diameter steam line?

Accepted Answer

Flanged connections can be disassembled without cutting or unthreading the pipe

Answer

Flanged connections allow piping to be disassembled by unbolting the flanges, making them ideal for large-diameter pipe and equipment connections that require periodic maintenance.

(Steamfitter) Steamfitter Pipefitter Exam Practice Test

(Steamfitter) Steamfitter Pipefitter Exam Practice Test

Steamfitter Pipe Systems and Materials 2