KSB MK, Installation & Operating Manual

Page: 11 / 64

2 Safety
11 of 64
MK
The temperature class specifies the maximum permissible temperature at the surface
of the pump set during operation. For the permissible operating temperature of the
pump in question refer to the data sheet.
Table 4: Temperature limits
Temperature class to EN 13463-1 or ISO
80079-36
Maximum permissible fluid temperature
T1 90 °C
T2 90 °C
T3 90 °C
T4 90 °C
T5 80 °C
Temperature class T5 Temperature class T5 can only be complied with if the bearing temperature is limited
to 80°C.
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, contact KSB for the maximum permissible
operating temperature.
2.9.3 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.
Bearing temperature monitoring
If temperature class T5 is to be complied with, the bearing temperature must be
monitored. For this purpose, the pump must be equipped with a temperature sensor
at the drive-end fixed bearing (G
1
/
8
connection, DIN 3852).
The temperature sensor must be operated with an ATEX-approved transducer
providing explosion protection for the sensor. The bearing temperature must be
monitored so as to ensure it does not exceed 80 °C.
2.9.4 Operating limits
The minimum flows indicated in (
ð
Section 6.2.3.1, Page 30) refer to water and
water-like fluids handled. Longer operating periods with these fluids and at the flow
rates indicated will not cause an additional increase in the temperatures at 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
(
ð Section 6.2.3.1, Page 30) can be used to check whether additional heat build-up
may lead to a dangerous temperature increase at the pump surface.