basic physics

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  1. Use Bernoulli’s Equation to solve for the pressure gauge reading at Point 1.

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QUESTION 2

  1. Using the answer above (Question 1), how high would a water tower need to be to generate that pressure reading?

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QUESTION 3

  1. What is the water velocity in the 12 inch pipe? And how many gpm are flowing?

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QUESTION 4

  1. Using the flow in gpm from above (Question 3) , what would the water plant capacity need to be to meet a fire protection demand?

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QUESTION 5

  1. With water flowing in the system below, how much pressure is lost due to friction? Give your answer in feet and psi.

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QUESTION 6

  1. If Q at Point 1 is 500 gpm, find V1, V2 and Q2

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QUESTION 7

  1. Using Q2 from above (Question 6) , what would be the pressure loss per foot due to friction if the pipe is a sch. 40 steel pipe, black steel as used on wet sprinkler systems? (Using Hazen-Williams EQ)

(round to 6 decimals)

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QUESTION 8

  1. Calculate the flow from each hydrant as noted below.
    1. 2 1/2″ outlet, Cd=0.9, pitot tube 42 psi
    2. 5″ outlet, Cd=0.9, pitot tube 42 psi
    3. 2 1/2″ outlet, cd=0.8, pitot tube 27 psi

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QUESTION 9

  1. If 2 gpm of water at 60oF is flowing in an 1 inch pipe, what is the Reynolds number? Is the flow Laminar or Turbulent?

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