Series SCK, Size 25-25-100
Page 8
9220-003-en
Revision 14
TM 10272
Edition 01/2021
Following table below indicates the admissible medi-
um temperature, depending on the pump design, as a
function of the temperature class in accordance with
DIN EN ISO 80079-36.
Temperature class
as per DIN EN ISO
80079-36
Limit value of the pumped
liquid temperature
PE-UHMW
PFA/PTFE
T4
(135 °C)
90 °C
1)
130 °C
1)
T3
(200 °C)
90 °C
150 °C
2)
Note : If the operating manual of the mechanical seal
demands a lower medium temperature than indicated in the
above table, this lower medium temperature is decisive.
1) Long life grease lubrication: no restriction.
Oil bath lubrication: standard design with shaft seal
T3
Labyrinthdichtungen (Sonderausführung)
T4
2) Consult the manufacturer for higher limit values.
If different temperature classes (e.g. pump T4, me-
chanical seal T3) arise when one medium is used for
pumps and the mechanical seal, the lower tempera-
ture class (in the above example T3) applies to the
entire pump including the mechanical seal.
Observance of the temperature class T4 with oil bath
lubrication is not possible with the standard shaft seal.
A labirinth seal must be used instead of the shaft seal
for the temperature class T4 and with oil lubricated
ball bearings.
2.6.8 Maintenance
To achieve safe and reliable operation, it must be
ensured in inspections at regular intervals that the unit
is properly serviced and kept in technically perfect
order.
Example: Functioning of the rolling bearings. The
mode of operation and operating conditions largely
determine the actual service life that can be attained.
Regular checks of the bearing pedestal area can pre-
vent excessive temperatures due to hot-running rolling
bearings, or even defective bearing seals. See
Sec-
tion 7.2
.
In regard to media containing solids, the maintenance
intervals must be set by the operator in accordance
with the conditions of operation.
If auxiliary systems (e.g. cooling, heating) are
installed, check to see whether monitoring facilities
are required to ensure their function.
2.6.9 Electric peripheral equipment
Electric peripheral equipment, e.g. pressure,
temperature and flow sensors etc. must
comply
with
the
prevailing
safety
requirements
and
explosion
protection
provisions.
