salmson NEX Manuel D'installation Et Mise En Service page 38

Open impeller generated rear pressure :
Pressure
In MS housing
[bar]
[bar]
Reverse vane impellers generated rear pressure :
Pressure
In MS housing
[bar]
[bar]
Hydrostatic test pressure : 1,5 x PS
5. 2. 2. 3 MINIMUM FLOW FOR CON TINUOUS
OPERATION
Permitted flow range :
is the constant flow corresponding to Best Efficiency Point.
Q
opt
Pump should work between 80% and 110% of Q
Q 5% Q
mini opt
Q 5% Q
mini opt
26% Q
Q
mini opt
Q 5% Q
mini opt
13% Q
Q
mini opt
28% Q
Q
mini opt
Q 5% Q
mini opt
13% Q
Q
mini opt
28% Q
Q
mini opt
35% Q
Q
mini opt
Q 5% Q
mini opt
9% Q
Q
mini opt
13% Q
Q
mini opt
28% Q
Q
mini opt
Q 5% Q
mini opt
13% Q
Q
mini opt
Differential
pressure
Differential
pressure
.
opt
PUMP SIZE
Impeller 125
Impeller 160
125‐100‐160
Impeller 200
100‐65‐200
125‐100‐200
Impeller 250
125‐100‐250
150‐125‐250
200‐150‐250
Impeller 315
125‐80‐315
150‐125‐315
200‐150‐315
Impeller 400
200‐150‐400
When the pump is used in an ATEX zone it is necessary to
measure the duty point and check that temperature
increase corresponding to each working condition is acceptable
regarding selected surface temperature.
The formula below gives the correspondence between surface
temperature / fluid temperature and pump efficiency :
T =T +
o f v

=[(g.H)/(c.)]*(1‐)
v
With :
c=calorific capacity of fluid in J/Kg.K
g=gravity in m/s²
H=pump head in m
T =liquid temperature in °C
f
T =surface temperature in °C
o
=hydraulic efficiency at duty point

=differential temperature
v
5. 2. 2. 4 MA XIMUM ALLOW AB LE SPEED AN D
NUMB ER OF STARTS PER HOUR
Maximum speed :
The maximum speed for each bearing bracket size is indicated in
the table below. The critical speeds of the impellers are much
higher than the maximum allowable speed of the corresponding
bearing bracket.
BEARING BRACKET
SIZE
24
32
42
48
Number of starts per hour :
Wait for pump full stop before starting‐up the pump again
to avoid damaging the motor and the pump.
Starting frequency depends on motor type. Ask
manufacturer if necessary.
It is recommended to limit the number of starts per hour to :
 15 starts per hour up to 15KW,
 10 starts per hour up to 90KW,
 6 starts per hour for higher installed powers.
5.2.2.5 TYPE OF HANDLED FLUIDS
The pump is used to transfer clear liquids or slightly laden fluids.
Fluid maximum viscosity is 500 cSt (mm² ).
It is possible to pump fluids containing particles when pump is run
at 1450 RPM with the following restrictions :
 Solids size smaller than 1 mm : 10% maxi in volume.
 Light particles with smaller size than 1 mm : 35% maxi of the
volume but liquid specific gravity should not be modified.
Pump can occasionally handle bigger size of solids but it will
drive to a reduction of pump life, increasing of equipment
noise level and absorbed power.
Free passage depends on the pump size :
PUMP SIZE
32‐20‐200
32‐20‐160 40‐25‐250
40‐25‐125 100‐80‐125 40‐25‐160
50‐32‐125 50‐32‐160 40‐25‐200
65‐40‐125 50‐32‐200 50‐32‐250
80‐50‐125 65‐40‐250 50‐32‐315
65‐40‐200
65‐40‐160 80‐50‐160 125‐100‐160
9
ENGLISH
SPEED
RPM
4700
3600
3600
2000
MAX
size
(mm)
Ø5
Ø6
Ø7
Ø8
Ø9
Ø10
Ø10.5
Ø11