New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

How is structural tubing typically sized?

1. By length and diameter

2. By wall thickness and weight

3. By outside diameter (OD) and wall thickness

4. By inside diameter (ID) and length

The correct answer is: By outside diameter (OD) and wall thickness

Structural tubing is typically sized by measuring the outside diameter (OD) and the wall thickness. This sizing method is standard in the pipe fitting and structural engineering industries because it provides important information about the tubing's strength and suitability for various applications. The outside diameter gives an indication of the overall size of the tubing, which is crucial for compatibility with fittings and connections in pipe systems. The wall thickness is essential because it directly impacts the structural integrity and pressure rating of the tubing. Thicker walls can withstand higher pressures and more demanding loads, making this measurement critical for safe and effective use in construction and piping applications. In contrast, sizing by length and diameter would not provide sufficient information regarding the structural capabilities of the tubing, as diameter alone does not account for wall thickness. Sizing by wall thickness and weight could introduce ambiguity since weight can vary based on the material used and may not directly correlate with the strength required for the application. Finally, sizing by inside diameter (ID) and length is generally more applicable to certain piping configurations, rather than the structural tubing context, where the outside diameter plays a central role.