Series SCK, Size 25-25-100
Page 6
9220-003-en
Revision 14
TM 10272
Edition 01/2021
In the event of operating conditions other than those
described in the data sheet, the following are to be
checked again:
design of the pump
design of the accessories
resistance of the materials.
2.2 For the customer / operator
The following must be observed:
The notes on safety contained in this operating manu-
al,
the prevailing regulations on accident prevention,
in-house work, operating and safety regulations of the
customer.
Protect hot, cold or moving machine parts from being
touched on site.
Do not remove any protective facilities when the ma-
chine is in operation.
Exclude any risks from electricity.
Remove leaks of hazardous media (e.g. explosive,
toxic, hot) so that there is no risk to people and the
environment. The statutory provisions are to be
observed.
Caution when using the units in potentially
explosive area!
Improper operation must be prevented.
2.3 For maintenance
Strictly, work on the pump/unit may only be performed
when it is at a standstill.
It is imperative to observe the procedure for stopping
the machine described in this operating manual. See
Section 6.3
.
Pumps which convey media which are a health haz-
ard must be decontaminated.
Immediately after completion of the work, re-install all
safety and protective facilities or put them into opera-
tion again.
Observe the points listed in
Section 6.1
prior to
recommissioning.
2.4 Conversion work and produc-
tion of spare parts by the cus-
tomer
Conversion of or changes to the machine are only
admissible after consultation with the manufacturer.
Original spare parts and accessories authorised by
the manufacturer serve to enhance safety.
The use of other parts may annul the liability for any
resultant consequences.
2.5 Improper operation
The operational safety of the machine supplied is only
guaranteed if it is used properly in accordance with
Section 2.1
of this operating manual.
The operating limits specified in the data sheet must
under no circumstances be exceeded.
2.6 Special requirements for ex-
plosion protection
If the units are used in potentially explosive areas, the
measures and notes in
Sections 2.6.1 to 2.6.9
are
imperative to guarantee the explosion protection.
2.6.1 Filling the unit
During pump operation the wetted interior of
the pump must always be filled with the liquid
medium.
This prevents any explosive atmosphere and the risk
of dry-running.
If the customer cannot ensure this, we
recommend that appropriate monitoring
facilities be provided.
Also carefully fill auxiliary, heating and
cooling systems.
2.6.2 Special operating conditions
The pump is normally used to convey ag-
gressive and inflammable liquids.
For safe pump operation, we recommend a flow rate
of 0.3 to 1.1 Q
opt
. If the pump is operated outside this
range, it must be ensured that the max. admissible
flow rate according to the pump characteristic curve is
not exceeded and that the max. admissible operating
temperature according to
Section 2.6.7
is observed.
If the flow rate is too high, there is a risk that the pres-
sure in the area of the mechanical seal falls until the
vapour pressure of the fluid is undershot. As a result,
this may lead to dry-running, particularly with the sin-
gle mechanical seals, involving inadmissible overheat-
ing and the destruction of the mechanical seal.
If the flow rate is too low, the medium may heat up so
much owing to the fluid friction that the max. admissi-
ble surface temperature of the relevant temperature
class is exceeded.
Overloading, overheating or non-observance of the
design data can result in inadmissible modes of
operation and it is therefore imperative to avoid them.
The situation is to be remedied by providing appropri-
ate monitoring facilities. See
Section 5.6
.
The plant NPSH value (NPSHA) must be 0.5 m higher
than the NPSH value of the pump (NPSHR to prevent
damage to the pump).
