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CHE 3013
Rate Operations I
Fall 2011
Homework 4
Due:
Monday, September 19, 2011
1 Problems, 24 points total
(a) (9 points)
What is the hexane flow rate delivered by P304 in the system shown below
under the following conditions:
Pump suction
30 psia, 188
°
F
Hexane pressure at outlet of HE310
20 psia
Pressure drop across control valve
7 psi
Pressure drop across heat exchanger
5 psi
30 psia
250 ft
2 in Sch 40 pipe
8
90 degree elbows, short radius (
r
/
D
=8)
4
Fullport gate valves, fully open
1
Swing check valve, fully open
1
Control valve
20 psia
13 ft
P304
HE310
The pump curve for P304 is attached and can be approximated by the equation
2
3
2
10
197
.
1
10
784
.
2
28
.
56
gpm
x
gpm
x
TDH
−
−
−
+
=
where
TDH
is in feet of fluid.
For complete turbulence, the friction factor is independent of
Reynolds number, i.e.
Re
→∞
in friction factor equations.
Note: Steady state is achieved when
Δ
P
pump
=
Δ
P
system
.
This requires an iterative solution.
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 Fall '11
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