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Basics in Process Design
Pump and pipe systems
Chemical Engineering Design,
Towler, Sinnott, 2013
Block flow diagrams
Calculate flows from mass and
energy balances
Rough sizing of equipment for
– storage
– preprocessing
– reaction
– separation,
– heat exchange
– transport
Instrumentation
Cost estimates
Today
Pumps
Pump curves
Pump and system
curves – Work point
Flow control
Recalculation of pump
curves
Example
Questions?
Positive displacement pumps
– pistonpump, membranepump, screwpump,
sliding vane pump, excenterscrew pump,
hosepump, loberotorpump, cogwheelpump
Rotating hydrodynamic pumps
– centrifugal pump (radial pump), axial pump
(propellerpump)
Other pumps
– mammothpump, ejectorpump
Pump types
http://www.zeta.se http://en.wikipedia.org http://www.sikama.se
http://www.pumpportalen.se http://pdf.directindustry.com
Pump characteristic curves
Centrifugal pumps
Pressure increase in a pump
at different flows at a certain speed
Changes in
speed or fluid
properties
changes the
curve
Pump and system curves
Work point
Combination of pump curve and
system curve gives work point
Recalculation of pump curves
original
original
new
original
newnew V
d
dV
3
original
original
new
original
new
original
newnew p
d
dp
22
original
original
new
original
new
original
newnew P
d
dP
53
Equations for transformation of pump curve coordinates.
Not equations for pump curves!
Example
Pump ammonia from synthesis to storage
tank according to last weeks example
Pump speed for transporting flow in mass
balance example
Pump type? Pump caracteristic curve for
water at nominal speed
0
50
100
150
200
250
300
350
0 2 4 6 8 10 12 14 16
pre
ssu
re i
ncre
ase
in
pu
mp
(kP
a)
volume flow (l/s)
work point
pipe system curve
original
original
new
original
new
original
newnew p
d
dp
22
original
original
new
original
newnew V
d
dV
3
original
original
new
original
new
original
newnew P
d
dP
53
0
50
100
150
200
250
300
350
0 2 4 6 8 10 12 14 16
pre
ssu
re i
ncre
ase
in
pu
mp
(kP
a)
volume flow (l/s)
work point
pipe system curve
pump curve 60 Hz
Questions?
