What happens to the allowable working pressure when the schedule and wall thickness increases?

A. It increases.
B. It decreases.
C. There is no change.
D. It changes the nominal pipe size.


A. Correct. As the schedule increases, the wall thickness increases, the ID is reduced, and the allowable working pressure is increased.
B. Incorrect. As the schedule increases, the wall thickness increases, the ID is reduced, and the allowable working pressure is increased.
C. Incorrect. As the schedule increases, the wall thickness increases, the ID is reduced, and the allowable working pressure is increased.
D. Incorrect. As the schedule increases, the wall thickness increases, the ID is reduced, and the allowable working pressure is increased.

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