Which dimension stays the same regardless of the wall thickness?

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Study for the API 570 Piping Inspector Test with comprehensive questions and detailed explanations. Prepare efficiently to pass the exam with confidence!

Multiple Choice

Which dimension stays the same regardless of the wall thickness?

Explanation:
The outer diameter stays the same because pipe size fixes the outside diameter, while changing the wall thickness (the schedule) only alters how thick the walls are. As you increase wall thickness, the inside diameter decreases since ID = OD − 2 × wall thickness; with the same outer diameter, a thicker wall means a smaller bore. The length of the pipe isn’t determined by wall thickness, so it remains unchanged as you vary thickness.

The outer diameter stays the same because pipe size fixes the outside diameter, while changing the wall thickness (the schedule) only alters how thick the walls are. As you increase wall thickness, the inside diameter decreases since ID = OD − 2 × wall thickness; with the same outer diameter, a thicker wall means a smaller bore. The length of the pipe isn’t determined by wall thickness, so it remains unchanged as you vary thickness.

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