Operating instructions B-Series
Version 2.4, En Page 73 of 81 21-10-2005
12 Summary of instructions for ATEX pumps
Code Requirement Supplementary remark OK?
K1
Choice (Selection) pump
Ensure a correct pump choice with respect to the
liquid type with its technical properties and
quantity.
With flammable, volatile liquids: ensure the correct
choice of material for the rotor and wear plate
(according to EN 13463-5:2003 §5.2, note 2).
• Make sure that the pump housing, etc. is not
adversely affected by the medium to be pumped.
K2 Ensure a correct suction line in relation to the
NPSH curve.
K3 Ensure sufficient counterpressure on the delivery
side so the pump does not run outside the curve.
K4 Ensure a good pipe diameter.
K5 Ensure a good inflow opening in the suction line.
K6a Ensure a correct mechanical shaft seal choice for
the liquid to be pumped.
Correct lubricant
• Checks (by temperature monitoring)
• Maintenance
• The ignition temp. of coolant must be at least 50 K
above the max. surface temp. of the pump (EN
13463-5:2003 §4.5).
• Provide a seal with extra guarantee against leakage
when pumping volatile liquid.
K6b Ensure a correct auxiliary system for the
mechanical shaft seal.
Take account of the flow rate and pressures in the
pump.
• Take account of the interaction of auxiliary liquid
with the medium to be pumped.
• The auxiliary system must itself be EX, cat. 2. Here
also note:
• What is the outside temp. of the auxiliary
system?
• Can the auxiliary system guard against the
build-up of ignitable gas inside?
K6c Use the correct packing
Take account of pressures in the pump.
• Take account of the interaction of packing with the
medium to be pumped.
K6d Ensure the correct choice of retaining ring
Retaining rings may contain no light-metals.
• The following materials are allowed:
• Elastomers, etc.
• PTFE
• Graphite
• Ceramics
K7 Make sure that dirt particles in piping systems
cannot cause blockages.
Fit a filter if necessary
K8 Make sure you choose the right coupling.
The coupling must be sufficient for the power and
number of revolutions.
• The coupling must be EX, cat. 2
• Follow the instructions of the manufacturer.
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