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3/2/22, 11:23 AM

FSE 360 Fire Prot Hydr & Water Supply, Spring 22, 20730

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Friction Loss in Piping

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* Question Completion Status:

10pt

Description

Instructions Using the friction loss and equivalent pipe length tables that can be found in NFPA

and/or FM Global documentation, complete the following questions.

Your answers are saved automatically.

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18

QUESTION 1

5 points

You have a water tank with a gauge at the bottom. The gauge reads 38psi. How high

is the water tank filled above the gauge?

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* Question Completion Status:

How many equivalent feet of pipe is included in the following arrangement of pipe and

appliances? Assume a c factor of 120 for all piping.

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320 feet of 8" steel pipe, an 8" gate valve, an 8 inch double check backflow preventer,

an 8" gate valve, 185 feet of 6" pipe, a 6" long turn elbow, and 2 feet of 6" pipe

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QUESTION 4

How much friction loss in in the above described run of pipe if it is flowing at

1,375gpm?

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QUESTION 5

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5 points Save Answer

Your combined sprinkler and hose stream demand requirement at the base of the riser

is 647gpm at 43 psi. You have a water test that shows you have 58 psi available at

647gpm at an effective point outside the building. The effective point is 9 feet higher

than the base of the riser. You have also calculated a friction loss of 3 psi at this flow

in the underground piping back to the effective point from the riser. Is the water supply

sufficient for this sprinkler system? If so, what is your safety margin in psi. If not, what

is your pressure deficiency in psi?

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