Richter SCK-S - Manual (Page 4)

Series MNK-S, MNK-SB, SCK-S, “Self-priming“ design Page 4
9230-062-en Revision 02
TM 6566 Edition 08/2006
In addition, the following applies to the self-priming
pumps:
Gas contents of up to 20% may be entrained.
Consult Richter if more than 5% gas contents are
conveyed. If gas is entrained in an explosive area,
it must be ensured that no explosive atmosphere
enters the pump as a result of the gas conveyed.
Owing to its design the pump can draw in media
on its own within certain operating areas.
It is imperative for the pump to be completely filled
prior to self-priming.
For self-priming in or out of an explosive area it
must be ensured that no potentially explosive at-
mosphere can form. This can be achieved by su-
perimposing the plant with an inert gas (e.g. nitro-
gen).
The medium must not exceed the medium tem-
perature specified in the table (see below) or its
boiling temperature. This can, for example, be en-
sured by a temperature monitor.
MNK-S, table 1
Temperature class
as per EN 13463-1
Temperature limit of the
medium
Auskleidung PFA/PTFE
T6 (85 °C)
T5 (100 °C)
not certified to ATEX
T4 (135 °C) 125 °C 1) 2)
T3 (200 °C) 150 °C
T2 (300 °C) 150 °C
T1 (450 °C) 150 °C
1) Long life grease lubrication : no restriction.
Oil bath lubrication : standard version with shaft seal
T4 is valid only up to and including 50 Hz,
T3 more than 50 Hz
T4 labyrinth seal (special design)
2) 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.
MNK-SB table 2 and 3
The temperature limits of the fluid given in Table 3
only apply when motors are used where the motor
manufacturer permits at least the following temperatu-
res for the motor flange and motor shaft:
Table 2
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 am-
bient temperature of 40 °C must not be exceeded.
Table 3
Temperature class
as per EN 13463-1
Temperature limit of the
medium
Auskleidung PFA/PTFE
T6 (85 °C) 75° C 2)
T5 (100 °C) 90 °C 2)
T4 (135 °C) 125 °C 2)
T3 (200 °C) 150 °C
T2 (300 °C) 150 °C
T1 (450 °C) 150 °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.
With motors of the ignition protection class "increased
safety" the max. admissible medium temperature is
the same as the motor shaft or motor flange tempera-
ture specified by the motor manufacturer.
In these cases the max. admissible medium tempera-
ture is 20 K above the temperature which may be in-
troduced 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 60 °C (60 °C + 20 K)..
SCK-S, table 4
Temperature class
as per EN 13463-1
Temperature limit of the
medium
Auskleidung PFA/PTFE
T6 (85 °C)
T5 (100 °C)
not certified to ATEX
T4 (135 °C) 130 °C 1)
T3 (200 °C) 150 °C
T2 (300 °C) 150 °C
T1 (450 °C) 150 °C
Note : If the operating manual of the mechanical seal de-
mands a lower medium temperature than indicated in
the above table, this lower medium temperature is de-
cisive.
1) Long life grease lubrication : no restriction.
Oil bath lubrication : standard version with shaft seal T3.
labyrinth seal (special design) T4.