PE Problem #41

7/27/2018

A fire pump's speed is altered from 1760 to 1800 rpm. What is the new head if the original was 120 ft?
a. 115 ft.
b. 123 ft.
c. 126 ft.
d. 128 ft.

Solution | Posted 07/31/18

7 Comments

Ginger

7/27/2018 09:42:03 am

c. 126

EdwH

7/27/2018 09:42:07 am

MeyerFire 5.23

H1 x (N2^2/N1^2) = H2

120 x (1.046) = 125.5

C.

7/27/2018 09:55:56 am

C - 126 (Meyerfire 5.23)

Colleen

7/27/2018 11:05:40 am

I assume we can use Pump Affinity Law for constant diameter? If that's the case, C. 126 ft.

H1/H2=N1^2/N2^2, so H2=H1*(N2/N1)^2=126.35 ft.

pari

7/27/2018 01:34:21 pm

C ,126 ft.

FPE

7/28/2018 06:02:36 am

c. 126 ft.

MIGUEL ARTURO NUNEZ

7/29/2018 11:42:49 am

126.0 (Pump Affinity Laws for a Specific Centrifugal Pump)

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