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ENV 4561
Fall 2011
Homework # 3
Assigned: September 8, 2011
Due: September 15, 2011
1)
(25 points)
Compute the headloss in feet of a 350 ft long, 1.5” pipe containing sludge (solids)
with the following conditions:
Answers may vary slightly
a)
Q = 25 gpm; 3% and 6% solids
h
L
for 3% = 17.5 ft, h
L
for 6% = 26.15 ft
b)
Q = 18 gpm; 9% and 1% solids
h
L
for 9% = 23.7 ft, h
L
for 1% = 9.3 ft
c)
How big must the pipe be to pump 45 gpm at 4 % solids and have a head loss equal to 14 ft?
Assuming the same length of pipe. Round your answer to the nearest diameter of
commercially available Schedule 40 PVC pipe. (Google is your friend here)
D
pipe
= 2.5 in
2)
(25 points)
Given the piping system shown below, calculate the Q (
in GPM
) conveyed between
the two tanks. Assume e (or k) = 0.3 mm, water temperature = 20
o
C.
Also, assume hydraulically
rough flow conditions. Account for all losses and
show all work
. Elevations shown below are in
feet
.
Answers may vary slightly, Q = 41.15 gpm
WSE 331.6
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This document was uploaded on 10/29/2011 for the course ENV 4601 at University of Florida.
 Spring '08
 Heaney

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