PUMPS AND PUMP UNITS
Where a pump or pump unit is to be installed in a
potentially explosive atmosphere ensure that this has
been specified at the time of purchase and that the
equipment has been supplied accordingly and
displays an ATEX nameplate or is supplied with a
certificate of conformity. If there is any doubt as to the
suitability of the equipment please contact Mono
Pumps Limited before commencing with installation
and commissioning.
Process liquids or fluids should be kept within
specified temperature limits otherwise the surface of
pump or system components may become an ignition
source due to temperature rises. Where the process
liquid temperature is less that 90ºC the maximum
surface temperature will not exceed 90ºC provided
the pump is installed, operated and maintained in
accordance with this manual. Where the process fluid
temperature exceeds 90ºC the maximum surface
temperature will be equal to the maximum process
fluid temperature.
Cavities that could allow the accumulation of
explosive gases, such as under guards, should where
possible, be designed out of the system. Where this is
not possible they should be fully purged before any
work is carried out on the pump or system.
Electrical installation and maintenance work should
only be carried out by suitably qualified and
competent persons and must be in accordance with
relevant electrical regulations.
All electrical equipment, including control and safety
devices, should be suitably rated for the environment
in to which they are installed.
Where there may be a risk of an accumulation of
explosive gases or dust non-sparking tools should be
used for installation and maintenance.
In addition to causing permanent damage to the
stator, dry running of the pump could generate a rapid
rise in the temperature of the stator tube or barrel,
which could become an ignition source. It is therefore
essential that a dry run protection device be fitted.
This must shut the pump down immediately should a
dry run situation occur. Details of suitable devices are
available from Mono Pumps Limited.
To minimise the risk of sparking or temperature rises
due to mechanical or electrical overload the following
control and safety devices should be fitted in addition
to a dry run protection system. A pressure relief
system whereby the pump can not generate
pressures in excess of the maximum rated pressure
or an over pressure device which should shut the
pump down when the maximum discharge pressure is
exceeded. A control system that will shut the pump
down if the motor current or temperature exceed
specified limits. An isolator switch that will disconnect
all electrical supply to the motor and ancillary
electrical equipment and be capable of being locked
in the off position. All control and safety devices
should be fitted, operated and maintained in
accordance with the manufacturer’s instructions. All
valves on the system should be open when the pump
is started otherwise serious mechanical overload and
failure may result.
It is important that the pump rotates in the direction
indicated on the nameplate. This must be checked on
installation and commissioning and after any
maintenance has been carried out. Failure to observe
this may lead to dry running or mechanical or
electrical overload.
ATEX - Page 1 of 2
Issued – February 2004
Reference - OMMP/028/01/R1
ATEX Warning Statements
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