Richter MNK-B Series - Manual (Page 8)

Series MNK-B, close-coupled design Page 8
9230-055-en Revision 09
TM 7345 Edition 10/2008
2.6.7 Temperature limits
In normal operating mode the highest
temperatures are to be expected at the
contact point shaft seal/shaft (only with oil
bath lubrication), on the inner races of the rolling
bearings and at high medium temperatures on the
surface of the pump housing.
We would like to point out that, under extreme
operating (medium temperature > 160°C) and
ambient conditions (ambient temperature
>30 °C), temperatures of over 130°C may arise on the
surface of the pump housing.
In the case of media >40° C the surface temperature
of the pump housing is generally lower than the
temperature of the medium as the plastic lining acts
as insulation.
If the pump is heated (e.g. heating jacket), it must be
ensured that the temperature classes prescribed in
the annex are observed.
The not heated pump surface must have free contact
with the environment.
During operation of the pump it must be
ensured that excessive deposits of dust are
prevented (regular cleaning) in order to
prevent the pump surface from heating to above the
admissible temperature.
The following always applies: No inadmissible
temperatures may be introduced into the motor and
the specifications of the motor manufacturer must be
observed.
The temperature limits of the fluid given in Table 2
only apply when motors are used where the motor
manufacturer permits at least the following
temperatures for the motor flange and motor shaft:
Table 1
Temperature
class
Motor flange Motor shaft
T6 70 °C 70 °C
T5 70 °C 80 °C
T4 75 °C 85 °C
T3 80 °C 100 °C
T2 80 °C 100 °C
T1 80 °C 100 °C
At the same time the specified max. admissible
ambient temperature of 40 °C must not be exceeded.
Table 2 below indicates the admissible medium
temperature, depending on the pump design, as a
function of the temperature class in accordance with
EN 13463-1.
Table 2
Temperature class acc. to
EN 13463-1
Limit value of the temperature of the liquid
Lining material PP PE-UHMW PFA/PTFE
Can material 2) CFK-F CFK-F CFK-F CFK-H
T6 (85° C) 75°C 1) 75°C 1) 75°C 1) 75°C 1)
T5 (100° C) 80°C 90°C 90°C 1) 90°C 1)
T4 (135° C) 80°C 90°C 125°C 1) 125°C 1)
T3 (200° C) 80°C 90°C 150°C 180°C
T2 (300° C) 80°C 90°C 150°C 180°C
T1 (450° C) 80°C 90°C 150°C 180°C
1) The limit values specified for the temperature of the medium at
the pump inlet are determined for the most unfavourable case
(high speed, low flow, low heat capacity of the medium, ....).
Under favourable operating conditions the limit values specified
may be increased by up to 5 K after consultation with the
manufacturer.
2) The can material has been list in the data sheet.
The plant customer must ensure that the
prescribed operating temperature is observed.
The maximum admissible temperature of the
liquid medium at the pump inlet depends on the
temperature class and the selected lining material
required in each case.
In the case of motors with the type of protection
"increased safety", no or low temperature entries are
generally permitted for the motor shaft and motor
flange related to an ambient temperature of 40 °C.
In these cases the max. admissible medium
temperature is 20 K above the temperature which may
be introduced into the motor.
e.g.: Max. motor shaft temperature: 60°C
Max. motor flange temperature: 65°C
This results in a maximum medium temperature for
the pump of 80 °C (60 °C + 20 K).