A pipe having a diameter of 30 cm is exposed to an atmospheric pressure of 70 cm of mercury, while the pressure inside is 33 cm of mercury. What is the maximum allowable internal pressure in the pipe?

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Pressurized pipe flow

A 15-kilometer-long pipe with a pipe diameter of one meter transports water at a speed of one meter per second. The pipe has a friction coefficient of 0.005. Calculate the frictional head loss?