Water flows at a rate of 2.4 ft3/s in an old, rusty 7.8-in.-diameter pipe that has a relative roughness of 0.010. It is proposed that by inserting a smooth plastic liner with an inside diameter of 7.0 in. into the old pipe as shown in the Figure the pressure drop per mile can be reduced. Is it true that the lined pipe can carry the required 2.4 ft³/s at a lower pressure drop than in the old pipe? Support your answer with appropriate calculations.

Water flows at a rate of 2.4 ft3/s in an old, rusty 7.8-in.-diameter pipe that has a relative roughness of 0.010. It is proposed that by inserting a smooth plastic liner with an inside diameter of 7.0 in. into the old pipe as shown in the Figure the pressure drop per mile can be reduced. Is it true that the lined pipe can carry the required 2.4 ft³/s at a lower pressure drop than in the old pipe? Support your answer with appropriate calculations.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Corrosion control methods

Corrosion may be defined as the method in which metals are attacked on their exteriors by gases existing in the atmosphere, converting them to their oxides, nitrides, sulfides, etc.

Question

I keep getting this part wrong and I've used many tries already; what's the correct answer?

Water flows at a rate of 2.4 ft³/s in an old, rusty 7.8-in.-diameter pipe that has a relative roughness of 0.010. It is proposed that by
inserting a smooth plastic liner with an inside diameter of 7.0 in. into the old pipe as shown in the Figure the pressure drop per
mile can be reduced. Is it true that the lined pipe can carry the required 2.4 ft³/s at a lower pressure drop than in the old pipe?
Support your answer with appropriate calculations.
7.8in.
Old
Pressure drop is a function of flow rate and roughness.
What is the mean velocity for the current 7.8 in. diameter pipe?
V₂ = 7.23
ft/s
What is the Reynolds number for the current 7.8 in diameter pipe?
Re = 388528
What is the friction factor for the current 7.8 in diameter pipe?
fo= 0.038
What is the pressure drop per mile for the current 7.8 in diameter pipe?
дро i 0.0477
psi/mile
-Liner
7.0in.
New

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