6 Commissioning/Start-up/Shutdown
43 of 80
Vitacast / Vitacast Bloc
×
×
×
Table 19:
Key
Symbol
Description
Unit
c
Specific heat capacity
J/kg K
g
Gravitational constant
m/s²
H
Pump discharge head
m
T
f
Fluid temperature
°C
T
O
Temperature at the casing surface
°C
Pump efficiency at duty point
-
Temperature difference
K
6.2.5.2 Density of the fluid handled
The pump input power changes in proportion to the density of the fluid handled.
CAUTION
Impermissibly high density of the fluid handled
Motor overload!
▷
Observe the information about fluid density in the data sheet.
▷
Make sure the motor has sufficient power reserves.
6.2.5.3 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.
6.2.5.4 Abrasive fluids
The fluid handled may contain abrasive particles up to a maximum content of 5 g/
dm³ and a maximum particle size of 0.5 mm. 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 commonly recommended inspection
intervals.
6.3 Shutdown/storage/preservation
6.3.1 Measures to be taken for shutdown
The pump (set) remains installed
ü
Sufficient fluid is supplied for the functional check run of the pump.
1. For prolonged shutdown periods, start up the pump (set) regularly between
once a month and once every three months for approximately five minutes.
ð
This will prevent the formation of deposits within the pump and the pump
intake area.
