Pipefitter Blueprint Reading and Symbols 2

Question 1

On an isometric piping drawing, which line type represents a pipe that runs behind or below another pipe in the view?

Accepted Answer

Hidden (dashed) line

Answer

Hidden or dashed lines in isometric piping drawings indicate pipe runs that are obscured by foreground pipes or structural elements.

Question 2

What does the abbreviation 'BW' next to a pipe connection on a P&ID indicate?

Accepted Answer

Butt weld

Answer

BW stands for Butt Weld, indicating that two pipe ends are joined by a full-penetration groove weld at the same pipe diameter rather than a socket or threaded connection.

Question 3

On a piping isometric drawing, what information is typically found in the bill of materials (BOM) table?

Accepted Answer

Item numbers, descriptions, quantities, sizes, and material specifications

Answer

The BOM table on an isometric drawing lists every component needed to build the spool, including item numbers, descriptions, quantities, sizes, and material grades.

Question 4

What does a '3D' elbow designation mean on a piping drawing?

Accepted Answer

The elbow has a centerline radius equal to 3 times the nominal pipe diameter

Answer

A 3D elbow has a centerline radius equal to three times the nominal pipe diameter, making it a long-radius bend used where flow turbulence must be minimized.

Question 5

Which ASME standard governs the dimensions of factory-made butt-welding fittings such as elbows, tees, and reducers?

Accepted Answer

ASME B16.9

Answer

ASME B16.9 covers factory-made wrought steel butt-welding fittings, specifying dimensions, tolerances, and pressure-temperature ratings for elbows, tees, reducers, and caps.

Certified Pipefitter Practice Test

Certified Pipefitter Practice Test

Pipefitter Blueprint Reading and Symbols 2