In a pipeline design, the usual practice is to assume that due to aging
- Athe effective roughness increases linearly with timeCorrect
- Bthe friction factor increases linearly with time
- Cthe pipe becomes smoother with time
- Dthe friction factor decreases linearly with time
Solution
Concept
Pipe roughness with time
Step-by-step solution
1. Effective roughness increases roughly linearly with time.
Explanation
Corrosion and deposits increase roughness.
Why the other options are wrong
Pipes do not become smoother.
Shortcut
Age → rougher.
Correct answer: A) the effective roughness increases linearly with time