KSB Etachrom NC, Installation & Operating Manual

Page: 35 / 62

6.2.3 Fluid handled
6.2.3.1 Flow rate
Table 10: Flow rate
Temperature range (t) Minimum flow rate Maximum flow rate
-30 to +70
℃
≈ 15 % of Q
Opt
4) See hydraulic curves
> 70 to +110 °C ≈ 25 % of Q
Opt
4)
The calculation formula below can be used to check if an additional heat build-up
could lead to a dangerous temperature increase at the pump surface.
×
×
×
Table 11: Key
Symbol Description Unit
c Specific heat capacity J/kg K
g Gravitational constant m/s
²
H Pump head m
T
f
Temperature of the fluid handled °C
T
o
Temperature at the casing surface °C
Pump efficiency at duty point -
Temperature difference K
6.2.3.2 Density of the fluid handled
The power input of the pump increases in proportion to the density of the fluid
handled.
CAUTION
Impermissibly high density of the fluid handled
Motor overload!
▷
Observe the information on fluid density indicated in the data sheet.
▷
Make sure the motor has sufficient power reserves.
6.2.3.3 Abrasive fluids
Do not exceed the maximum permissible solids content specified in the data sheet
When the pump handles fluids containing abrasive substances, increased wear of the
hydraulic system and the shaft seal are to be expected. In this case, reduce the
intervals commonly recommended for servicing and maintenance.
DANGER
Abraded casing wall
Risk of explosion!
▷
Use a pump with anti-swirl baffle.
▷
Adjust the inspection intervals to the increased abrasion.
▷
For combustible fluids: The fluids must not contain any abrasive particles.
4) Best efficiency point
6 Commissioning/Start-up/Shutdown
Etachrom NC 35 of 62