11 Maintenance
WARNING!
ATEX pumps in areas at risk from explosion
– Carry out a general check to ensure that the system
is working properly, particularly the power end and
bearings, by regularly monitoring it (for leaks,
noises, temperatures, smell, etc.).
–
Do not allow the pump to run hot due to a lack of oil.
With lubricated metering pumps, regularly check for
the presence of lubricant, for example by checking
the liquid level, visual leak control etc. If oil is
leaking, examine the leakage point immediately and
eliminate the cause.
– Check the correct operation of the relief valve down‐
stream of the pump. In premises at risk from explo‐
sion, the relief valve should prevent the gear from
becoming overloaded and becoming hot.
– Observe the enclosed operating instructions for the
Ex motor.
– Check / replace worn gear ring etc. of the clutch.
– When cleaning plastic components, ensure that no
electrostatic charge is generated by the use of too
dry a cloth.
– Prevent serious deposits of dust on the motor.
– Consider potential equalisation before you approach
any pump equipment that could be at a different
electrical potential (such as pipes or tools).
– Only with stroke control motor: Wait 3 minutes after
switching off before opening the housing.
– Replace wear parts, such as bearings, when there is
an identifiable incidence of unacceptable wear.
– After 40,000 h: The pump bearing must be replaced
every 40,000 hours for ongoing ATEX use.
– Appropriate diagnostic equipment for bearing
damage is recommended for the premature detec‐
tion of bearing damage.
– Check whether the potential equalisation lines are
all sitting correctly with clean contacts. Use the equi‐
potential bonding drawings as an aid – see
Appendix.
– Check whether the earth lines are all sitting correctly
with clean contacts. Use the equipotential bonding
drawings as an aid – see Appendix.
– Only use genuine spare parts as replacements.
WARNING!
ATEX pumps in areas at risk from explosion
Static electricity can cause ignition sparks
– Always earth the discharge line and suction line first
before working on the pump.
WARNING!
Fire hazard with flammable media
Only with flammable media: They can be ignited by
oxygen.
– The pump may not work if there is a mixture of feed
chemical with oxygen in the liquid end. A specialist
may need to take appropriate actions (using inert
gas, ...).
Safety information
Maintenance
44
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