PE Problem #91

10/9/2018

A project site is connected to a water tank through an equivalent 650 feet of 6-inch schedule 10 pipe (c-factor of 140). If the water tank is 165 feet above the project site, the fire flow available at the project site is most nearly:
     a. 1,300 gpm
     b. 2,100 gpm
     c. 2,400 gpm
     d. 8,700 gpm

Solution | Posted 10/10/18

10 Comments

Vince

10/9/2018 08:19:21 am

1,300 @ 49.39

Jimmy

10/9/2018 06:24:02 pm

A. My logic would be to say Pt=71.46psi. Pv + Pp at the given flows are 23.4 psi, 56.7 psi, 73 psi and 748 psi. What's the required delivery pressure? You end up @ 54psi, 17.5psi, 0, & impossible. Any answer below 54 psi won't spray for beans--not exactly useful to fight a fire, right?

FPE

10/9/2018 10:05:47 am

c. 2,400 gpm,
Ref - convert 165 feet head to psi and use Hazen William formula to find out Q

Pari

10/9/2018 11:08:45 am

C ,2400 gpm

Vince

10/9/2018 12:43:32 pm

Friction loss in 650 ft of 6" @ 140 =22.22 psi. Doesn't that play a part here?

migdalia guzman

10/9/2018 11:47:27 am

C, 2400 GPM

MHK

10/9/2018 07:32:52 pm

b. 2,100 gpm

10/9/2018 09:44:00 pm

c. if you are supplying a pump (much higher full than that and the pressure at the pump suction would drop below zero). Without a pump it would be a. or b. depending on the sprinkle systems required pressure. I used Hazen Williams and solved for the the three lowest flow rates individually. Is there a direct way to solve?

10/11/2018 09:13:04 am

Are these the same problems as in the Meyer PE Guide?

Joe Meyer

10/11/2018 09:58:08 am

Hi AJ,

No these daily problems are all different than the PE Prep Guide. Thanks!

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