KSB HPK-L, Installation & Operating Manual

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2 Safety
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HPK-L
1136.8/15-EN
The table ( ð Table 4) lists the temperature classes and the resulting maximum
permissible fluid temperatures. The values shown correspond to the theoretical
limits. They include only a general safety margin for the mechanical seal. For single
mechanical seals, the safety margin required for specific operating conditions and
mechanical seal designs may be substantially higher. If operating conditions differ
from those stated on the data sheet, or if different mechanical seals are used, the
actual safety margin required needs to be determined individually. If in doubt please
contact the manufacturer.
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 ISO 80079-36 Maximum permissible
fluid temperature
2)
T1 Maximum 400 °C
3)
T2 280 °C
T3 185 °C
T4 120 °C
T5 85 °C
T6 Only after consultation
with the manufacturer
Temperature class T5 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.
Temperature class T6 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, the data sheet is missing 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 about monitoring equipment.
2.9.4 Operating limits
The minimum flow rates indicated in (
ð
Section 6.2.4.1, Page 41) 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 6.2.4.1, Page 41) can be used to check whether additional heat build-
up may lead to a dangerous temperature increase at the pump surface.
2
Subject to further limitations for mechanical seal temperature rise
3 Depending on the material variant