Chemical Engineering January 2018 - 37
A
G
ft
700
Co
1.00
400
200
100
40
20
15
0.80
0.70
0.60
0.95
0.90
0.05
CH
5,000
2,000
1,000
500
0.10
0.15
0.18
200
100
50
30
C
B
gal/min
10,000
D
CS
10,000
F
4,000
2,000
1,000
400
200
100
40
20
10
6
CHP
1.80
1.50
1.40
1.30
1.20
1.15
1.10
1.05
E
cial pump is readily available (see
section on suction-specific speed
later in this article)
5. Check for potentially suitable
pumps using a composite performance
curve and an individual
pump performance curve
6. Compare the energy consumption
and lifecycle cost of operating the
selected pumps
1.00
FIGURE 2. Shown here is a viscosity correction chart. The red dashed line corresponds to Example 2 on
p. 40
function of the four key components
of a pumping system, such
as the one shown in Figure 1
2. Correct for the viscosity of the
fluid being pumped, since pump
charts and data are given for
water with a viscosity of 1 cP. The
viscosity of other process fluids
can differ dramatically
3. Calculate the net positive suction
head (NPSH) to select a pump that
will not undergo cavitation
4. Check the value of suction-specific
speed to see if a commerCalculating
friction losses
Pumps must overcome the frictional
losses of the fluid in order for the
fluid to flow in the suction and discharge
lines. These frictional losses
depend on pipe roughness, valves,
fittings, pipe contractions, enlargements,
pipe length, flowrate and liquid
viscosity.
To calculate the frictional head
losses, in feet of liquid being
pumped, on the suction (hs,f) and
discharge (hd,f) side of the pump,
Equation (1) can be used. The same
equation can be applied to calculate
the frictional losses of the discharge
side, but with the appropriate values
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24
22
20
18
16
14
12
10
8
6
4
2
BATCH 1
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IS DONE
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CHEMICAL ENGINEERING WWW.CHEMENGONLINE.COM
JANUARY 2018
35
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Chemical Engineering January 2018
Table of Contents for the Digital Edition of Chemical Engineering January 2018
Contents
Chemical Engineering January 2018 - Cover1
Chemical Engineering January 2018 - Cover2
Chemical Engineering January 2018 - Contents
Chemical Engineering January 2018 - 2
Chemical Engineering January 2018 - 3
Chemical Engineering January 2018 - 4
Chemical Engineering January 2018 - 5
Chemical Engineering January 2018 - 6
Chemical Engineering January 2018 - 7
Chemical Engineering January 2018 - 8
Chemical Engineering January 2018 - 9
Chemical Engineering January 2018 - 10
Chemical Engineering January 2018 - 11
Chemical Engineering January 2018 - 12
Chemical Engineering January 2018 - 13
Chemical Engineering January 2018 - 14
Chemical Engineering January 2018 - 15
Chemical Engineering January 2018 - 16
Chemical Engineering January 2018 - 17
Chemical Engineering January 2018 - 18
Chemical Engineering January 2018 - 19
Chemical Engineering January 2018 - 20
Chemical Engineering January 2018 - 21
Chemical Engineering January 2018 - 22
Chemical Engineering January 2018 - 23
Chemical Engineering January 2018 - 24
Chemical Engineering January 2018 - 25
Chemical Engineering January 2018 - 26
Chemical Engineering January 2018 - 27
Chemical Engineering January 2018 - 28
Chemical Engineering January 2018 - 29
Chemical Engineering January 2018 - 30
Chemical Engineering January 2018 - 31
Chemical Engineering January 2018 - 32
Chemical Engineering January 2018 - 33
Chemical Engineering January 2018 - 34
Chemical Engineering January 2018 - 35
Chemical Engineering January 2018 - 36
Chemical Engineering January 2018 - 37
Chemical Engineering January 2018 - 38
Chemical Engineering January 2018 - 39
Chemical Engineering January 2018 - 40
Chemical Engineering January 2018 - 41
Chemical Engineering January 2018 - 42
Chemical Engineering January 2018 - 43
Chemical Engineering January 2018 - 44
Chemical Engineering January 2018 - 45
Chemical Engineering January 2018 - 46
Chemical Engineering January 2018 - 47
Chemical Engineering January 2018 - 48
Chemical Engineering January 2018 - 49
Chemical Engineering January 2018 - 50
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Chemical Engineering January 2018 - 56
Chemical Engineering January 2018 - 57
Chemical Engineering January 2018 - 58
Chemical Engineering January 2018 - 59
Chemical Engineering January 2018 - 60
Chemical Engineering January 2018 - 61
Chemical Engineering January 2018 - 62
Chemical Engineering January 2018 - 63
Chemical Engineering January 2018 - 64
Chemical Engineering January 2018 - 65
Chemical Engineering January 2018 - 66
Chemical Engineering January 2018 - Cover3
Chemical Engineering January 2018 - Cover4
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