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
°C
6.2.4 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.
6.2.5 Viscosity of the fluid handled
The discharge head, flow rate and power input of the pump are influenced by the
viscosity of the fluid handled.
CAUTION
The fluid handled has a higher viscosity than permitted.
Risk of motor overload!
▷
Observe the viscosity limits for the fluid handled given in the data sheet.
▷
Make sure the motor has sufficient power reserves.
6.2.6 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.
6.2.7 Cleaning in place (CIP)
CAUTION
Elastomers do not have sufficient resistance
Damage to the pump!
▷
Effect cleaning/sterilisation only if the elastomer components used in the pump
(e.g. O-rings, mechanical seals) are made of EPDM or other approved materials.
CIP may be effected with the pump running or with the pump stopped.
Recommended flow velocity: between 1.5 and 3 m/s
Conditions
6 Commissioning/Start-up/Shutdown
Vitastage
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