DMX/DMXD/DMXH/DMXDH USER INSTRUCTIONS ENGLISH 71569282 - 10/09
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overheating of the pump, instability and cavitation/
vibration.
Do not run the pump at abnormally
high or low flow rates. Operating at a flow rate higher
than normal or at a flow rate with no backpressure on
the pump may overload the motor and cause pump
cavitation.
Never do maintenance work when
the unit is connected to power.
When the pump is handling hazardous
liquids care must be taken to avoid exposure to
the liquid by appropriate sitting of the pump,
limiting personnel access and by operator
training. If the liquid is flammable and/or
explosive, strict safety procedures must be
applied.
HANDLING COMPONENTS
Many precision parts have sharp corners and the
wearing of appropriate safety gloves and
equipment is required when handling these
components. To lift heavy pieces above 25 kg (55
lb) use an appropriate crane for the mass and in
accordance with current local regulations.
Coupling guards must not be removed while
the pump is operational.
THERMAL SHOCK
Rapid changes in the temperature of the liquid
within the pump will cause thermal shock, which
can result in damage or breakage of components
and should be avoided.
HOT (and cold) PARTS
If hot or freezing components or auxiliary heating
supplies can present a danger to operators and
persons entering the immediate area action must
be taken to avoid accidental contact. If complete
protection is not possible, the machine access
must be limited to maintenance staff only, with
clear visual warnings and indicators to those
entering the immediate area. Note: bearing
housings must not be insulated and drive motors
and bearings may be hot.
If the temperature is greater than 68 °C (154°F) or
below -5 °C (20 °F) in a restricted zone, or
exceeds local regulations, action as above shall
be taken.
1.6.4
Products used in potentially explosive
atmospheres
Measures are required to:
•
Avoid excessive temperature
•
Prevent the build up of explosive mixtures
•
Prevent the generation of sparks
•
Prevent leakages
•
Maintain the pump to avoid hazard
The following instructions for pumps and pump units
when installed in potentially explosive atmospheres
must be followed to help ensure explosion protection.
Both electrical and non-electrical equipment must
meet the requirements of European Directive
94/9/EC.
1.6.4.1
Scope of compliance
Use equipment only in the zone for which it is
appropriate. Always check that the driver, drive
coupling assembly, seal and pump equipment are
suitably rated and/or certified for the classification of
the specific atmosphere in which they are to be
installed.
Where Flowserve has supplied only the bare shaft
pump, the Ex rating applies only to the pump. The
party responsible for assembling the ATEX pump set
shall select the coupling, driver and any additional
equipment, with the necessary CE Certificate/
Declaration of Conformity establishing it is suitable for
the area in which it is to be installed.
The output from a variable frequency drive (VFD) can
cause additional heating effects in the motor and so,
for pumps sets with a VFD, the ATEX Certification for
the motor must state that it is covers the situation
where electrical supply is from the VFD. This
particular requirement still applies even if the VFD is
in a safe area.
1.6.4.2
Marking
An example of ATEX equipment marking is shown
below. The actual classification of the pump will be
engraved on the nameplate.
