Viking Pump TSM285: Classic+ Lobe Pump - Manual (Page 6)

SECTION TSM 285 ISSUE A PAGE 6 OF 36
3.3 SySTEM DESIGN
3.3.1 SySTEM DESIGN AND
INSTALLATION
When incorporating any pump into a system it is considered
good practice to minimize piping runs and the number of pipe
fittings (tees, unions, bends etc.) and restrictions. Particular
care should be taken in designing the suction line, which
should be as short and straight as possible with a minimum of
pipe fittings to minimise restricting product flow to the pump.
The following should be considered at the design stage of any
system.
Be sure ample room is provided around the pump
to allow for:
- Access to the pump and drive for routine
inspection and maintenance, i.e. to remove
pump head and rotors.
- Ventilation of the drive to prevent over
heating.
The exterior of the pump unit may exceed 68°C
(154°F); Appropriate measures must be taken to
warn or protect operators.
The pump must not be used to support piping.
All piping to and from the pump unit must be
independently supported. Failure to observe
this may distort the pump head components
or assembly and cause serious consequential
damage to the pump.
Valves should be provided adjacent to the pump suction and
discharge connections to allow the pump to be isolated from
the system for routine inspection and maintenance.
Rotary lobe pumps are of the positive displacement
type and therefore an overload protection device
must be provided. This can take the form of:
- An in-line pressure relief system, i.e. external
to the pump.
- Incorporation of a torque-limiting device in the
drive system.
It is recommended that all piping and associated
equipment from the tank to the discharge point
is thoroughly cleaned before installation of the
pump to avoid the possibility of debris entering
the pump and causing damage.
Pressure gauges should be installed adjacent to
the pump suction and discharge connections such
that system pressures can be monitored. These
gauges will provide a clear indication of changes
in operating conditions and where a relief valve
is incorporated in the system, will be necessary
for setting and checking the functioning of the
valve.
It is imperative that the suction condition at the
pump inlet meets the Net Positive Suction Head
required (NPSHr) by the pump. Failure to observe
this could cause cavitation, resulting in noisy
operation, reduction in flow rate and mechanical
damage to the pump and associated equipment.
The Net Positive Suction Head available
(NPSHa) from the system must always exceed
the Net Positive Suction Head required (NPSHr)
by the pump.
Pump Range Theoretical Displacement
Nominal
Connection
Size
Max
Differential
Pressure
Max.
Speed
Max
Speed @
Max Diff.
Pressure
Max Diff.
Pressure
@ Max
Speed
ltr/rev Imp.gal
/100 rev
US gal
/100 rev mm
in. bar psi
rev/
min
rev/min bar psi
CP10S 0.046 1.01 1.22 25 1 12 175 1400 1000 8.5 120
CP10M 0.083 1.83 2.19 38 1.5 8 120 1400 1000 5.5 75
CP10L 0.111 2.44 2.93 38 1.5 5 70 1400 1000 3.5 50
CP20S 0.202 4.44 5.34 38 1.5 12 175 1000 750 8.5 120
CP20L 0.313 6.89 8.27 50 2 7 100 1000 750 5.0 70
CP30S 0.694 15.27 18.34 50 2 12 175 750 550 8.5 120
CP30L 1.125 24.75 29.72 76 3 7 100 750 550 5.0 70
CP40S 1.800 39.60 47.56 76 3 12 175 700 520 8.5 120
CP40L 2.500 55.00 66.05 101 4 7 100 700 520 5.0 70
CP50S 3.514 77.31 92.84 101 4 12 175 650 420 8.5 120
CP50L 5.250 115.50 64.20 152 6 8 115 600 420 5.5 75
CP20/CP30 High Efficiency Operating Parameters.
CP20S 0.202 4.44 5.34 38 1.5 7 100 1000 750 5.0 70
CP20L 0.313 6.89 8.27 50 2 4 55 1000 750 3.0 40
CP30S 0.694 15.27 18.34 50 2 7 100 750 520 5.0 70
CP30L 1.125 24.75 29.72 76 3 4 55 750 520 3.0 40
Classic+ Series
Operating Temperature Limit (°C)
Class A Class B Class C Class D
CP10, 20, 30, 40 70 100 150 N/A
CP50 N/A 100 N/A 180
figure 6
Operating Parameters
10
.0
M
et
er
s
(3
2.
8
Fe
et
)W
at
er
C
ol
um
n
Suction Lift
Or Vacuum
Atmospheric
Pressure
Suction
Head
NPSH
Available
Suction Line
Friction Loss
Vapour
Pressure
NPSH
Available
Suction Line
Friction Loss
Vapour
Pressure
For Suction Lift
Or Vacuum
Conditions.
For Conditions
With Positive
Suction Head.
Atmospheric
Vacuum
figure 7
NPSH
!
WARNING
!
!
WARNING
WARNING
WARNING
WARNING