Operating instructions B-Series
Version 2.4, En Page 33 of 81 21-10-2005
Extra point(s) for attention with ATEX pumps.
K2.
K4.
K5.
K6c.
K7.
P2a.
P2b.
P3.
P4.
G2.
B4b.
Ensure a correct suction line in relation to the NPSH curve.
Ensure a good pipe diameter.
Ensure a good inflow opening in the suction line.
Use the correct packing.
Make sure that dirt particles in piping systems cannot cause blockages.
• Fit a filter if necessary.
Prevent dirt particles in the medium
• With volatile, flammable liquids only a clean, filtered medium may be used.
Prevent
dirt particles larger than the dirt passage of the rotor from arriving in the suction
line and pump.
Make sure that the pump (unit) is mechanically well shielded while operating.
Make sure that the pump is installed without any stresses.
Make sure that liquid supply to the pump is smooth and oxygen-free.
Protect pump against underpressure.
• Only required when pumping volatile liquid.
• Determine the max. underpressure on the basis of the NPSH line, see technical
specifications B-Series.
• (Only with Cat. 2 pumps)
Dangers in
connection
with the
software:
It is the responsibility of the employer to ensure that the safety
measures (such as protection with underpressure) and the
resulting action (such as the stoppage of the pump) are
appropriately included in the safety circuit.
Integrated
explosion safety:
For the case of an internal explosion, which is excluded to the
extent possible, it is the responsibility of the user to decide if
technical measures (such as quick-acting valves) must be taken
to prevent and/or limit the explosion.
When using a suction strainer or filter continuously check the piping losses in the suction line. Check that
the inlet pressure at the suction flange of the pump is still sufficiently high (see NPSH graphs).
For closing the suction line for assembly or repair activities there must be a valve near the pump (see
section “Technical specifications”). The valve may not be used for the regulation of the pump, and must
be fully open during operation.
With self-priming pumps provided with a separate suction bend the latter may never be removed or turned.
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