temperature limits of the fluid handled (a possible temperature rise in the shaft seal
area has already been taken into account).
Table 4: Temperature limits
Temperature class to EN 13463-1
Maximum permissible fluid
temperature
T1
Maximum 200
℃
T2
Maximum 200
℃
T3
185 °C
T4
120 °C
T5
85 °C
T6
Only after consultation
with the manufacturer
Based on an ambient temperature of 40 °C and proper maintenance and operation,
compliance with temperature class T5 is warranted in the area of the rolling element
bearings. If the ambient temperature exceeds 40 °C, contact the manufacturer.
A special design is required to comply with the requirements of temperature class T6
in the bearing area.
Misuse, malfunctions or non-compliance with the instructions may result in
substantially higher temperatures. If the pump is to be operated at a higher
temperature, if there is no data sheet, or if the pump is part of a pool of pumps, the
maximum permissible operating temperature must be enquired from the pump
manufacturer.
2.10.3 Monitoring equipment
The pump (set) must only be operated within the limits specified in the data sheet
and on the name plate.
If the system operator cannot warrant compliance with these operating limits,
appropriate monitoring devices must be used.
Check whether monitoring equipment is required to ensure that the pump set
functions properly.
Contact KSB for further information on monitoring equipment.
2.10.4 Operating limits
The minimum flow rates indicated refer to water and water-like fluids. Longer
operating periods with these fluids and at the flow rates indicated will not cause an
additional increase in the temperatures on the pump surface. However, if the
physical properties of the fluids handled are different from water, it is essential to
check whether an additional heat build-up may occur and if the minimum flow rate
must therefore be increased. The calculation formula in this manual can be used to
check whether an additional heat build-up may lead to a dangerous temperature
increase at the pump surface.
Unless specified otherwise in the characteristic curves or on the data sheets, the
following applies:
Q
max.
2)
: See characteristic curves
Q
min.
3)
= 0.15 x Q
opt.
4)
The data refer to water and water-like fluids. Longer operating periods with the
fluids and flow rates indicated will not cause an additional increase in the
temperatures on the pump surface. However, if the physical properties of the fluids
handled are different from water, the calculation formula below must be used to
check if an additional heat build-up may lead to a dangerous temperature increase at
the pump surface. If required, increase the minimum flow rate.
Temperature class T5
Temperature class T6
Flow rate
2)
Maximum permissible flow rate
3)
Minimum permissible flow rate
4)
Best efficiency point
2 Safety
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