Operation; Safety Instructions For Operating The Explosion-Proof Pump; Maintenance; Cleaning - Grundfos DMH 25X Montage- Und Betriebsanleitung

7. Operation

7.1 Safety instructions for operating the
explosion-proof pump

Warning

Risk of explosion due to overheating of the pumps.
The pumps must not run against closed valves and
fittings.
Warning
The pump must not run dry, even during
commissioning or recommissioning.
Faults, e.g. reduction in dosing performance, may be
caused by damage to the pump, leading to an
Caution increased risk of explosion.
In the event of a fault during operation, the pump
must be stopped immediately and the fault corrected.

8. Maintenance

Warning
Risk of explosion due to overheating of the pumps.
Prescribed maintenance operations must be carried
out at regular intervals in order to ensure continued
conformity with the requirements of Directive
2014/34/EU.

8.1 Cleaning

In order to prevent heat accumulating due to dust
Caution
deposits on the pump, the pump must be cleaned at
regular intervals.
It is the responsibility of the operator to set suitable intervals.
Dust must not be allowed to accumulate > 5 mm.

8.2 Lubrication

Check the pump regularly for noise generation. The
Caution
bearings must not overheat.
DMH 25X and DMH 28X: Check the oil level every two weeks. If
there is insufficient oil, stop the pump immediately and add oil.
Change the oil every 8000 operating hours.
Only use oil approved by Grundfos.
DMX 226: The gear lubricant must be changed every 8000
operating hours by qualified and authorised personnel or by the
manufacturer.

8.3 Accessories / peripherals

Danger due to the formation of explosive vapours:
All seals, screw connections and deaeration screws
Caution
must be checked regularly to make sure that they are
operational and tight.
Check the overflow valve (if installed) regularly to
make sure that it is functioning correctly. In the event
Caution
of a fault in potentially explosive atmospheres, the
overflow valve must prevent the gear becoming
overloaded and overheated.
Check the filter in the suction line or on the suction
lance regularly, and clean it, if necessary. It is the
responsibility of the operator to set suitable intervals.
Caution
Check the lines regularly to make sure that they are
tight.

8.4 Tools and maintenance work

Warning
Tools meeting the requirements of EN 1127-1
Appendix A must be used for all operations on
pumps in potentially explosive atmospheres.
There is a general ban on the use of any type of steel
tool in Zone 1 if there is a risk of explosion due to
materials in Explosion Group IIC and hydrogen
sulphide, ethylene oxide or carbon monoxide.
Warning
Pump maintenance should be carried out in
non-explosive atmospheres or only if it can be
proven that the area in which repairs are to be
carried out is not a potentially explosive atmosphere.

The original configuration of the pump must not be

Caution
modified.
For information about spare parts, please refer to the general
installation and operating instructions for the pump.

9. Declaration of conformity / certificates

The EC declaration of conformity in this document replaces the
declaration of conformity in the general installation and operating
instructions supplied with the pump.
Any modifications made to the pump without our approval will
invalidate this declaration.
Before installing the pump, make sure that the system into which
it is installed complies with the provisions of the directives.
Commissioning is prohibited until this has been established.
The type examination certificate is supplied with the pump (in
English and German).
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