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Thread: using reynolds number vs C when calculating head loss

  1. #1

    using reynolds number vs C when calculating head loss

    in question 17-2 of practice problems for the civil engineering pe exam by michael lindendburg, 13th edition, there is a pipe that connects points A and B. it gives pipe length, diameter, pipe material, temperature of water and the flow rate Q. B is 60 feet above Point A. it asks the pressure at point A if the pressure B is 50..

    when i did this, i used C from the tables, coefficient of friction for the steel pipe in order to calculate the head loss. i didnt use the temperature at all. but they used the temperature information and did it by calculating reynolds number. how do we know when we use C or reynolds number when calculating the head loss hf? why didnt they use the formula with the L, C, V, D to calculate the head loss? I used that one and still was able to calculate something. although it was wrong. they used the Reynolds number. I didnt understand why

  2. #2

    using reynolds number vs C when calculating head

    It has and can be done. But still any time you mix cold and hot you have to prepare for condensation. With chilled water you still need to prep the board and socket area to make sure none gets trapped.

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