Operating instructions B-Series
Version 2.4, En Page 54 of 81 21-10-2005
Extra point(s) for attention with ATEX pumps.
B5.
G8.
Protect pump against temperature.
• (Only with Cat. 2 pumps)
Make sure that the pump is filled with liquid at the correct temperature.
Dangers relating to
the software:
It is the responsibility of the employer to ensure that the
safety measures (such as protection against temperature) and
the resulting action (such as the stoppage of the pump) are
appropriately included in the safety circuit.
The pump may never run for a protracted period against a closed discharge
line valve. Pumps with a motor capacity higher than 11 kW may never run
against a closed valve. This causes danger of explosion. Impermissible heating
up of the liquid can cause damage to the pump. If during start-up vibration
occurs, one must immediately remedy this before again starting up.
8.6 Switching off
When switching off the pump/pump unit always proceed as follows:
•
Switch the motor off.
•
Disconnect the secondary piping (sealing or rinsing liquid).
•
When the congealing of the liquid must be avoided, this must be from removed the pump while
the liquid is still fluid.
•
Close the valve in the pressure line. When a non-return valve is present and there is sufficient
counterpressure in the pressure line, the discharge line valve can remain open.
•
Switch off motor and ensure that the installation smoothly comes to a stop.
•
Disconnect the secondary piping (sealing or rinsing liquid).
•
Close the valve in the suction line.
•
At temperatures below freezing point and/or with longer periods out of use, the pump must be
fully drained and preserved.
8.7 Restarting
Switching on again is only allowed with stationary pump shaft.
Liquid flowing back with a stationary pump may not cause the opposite direction
of rotation of the pump. This can result, among other things, in the mechanical
shaft seals dependent on the direction of rotation being damaged.
In the above cases a non-return valve or other valve must be fitted.
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