Flowserve ATEX E - Manual (Page 5)

ATEX- E/F/D/N - 11-09
Page 5 of 20 flowserve.com
In dirty or dusty environments, regular checks must
be made and dirt removed from areas around close
clearances, bearing housings and motors.
2.5.5 Additional requirements for pumps with
magnetic drive
It is recommended for users to fit a temperature
monitor in the magnetic drive bearing/shell area when
pumping liquids with solids content or liquids that can
polymerize or freeze.
In unmanned locations where a magnetic drive is
used it is advisable to fit a vibration monitor.
2.5.6 Additional requirements for self-priming
casing pumps
Where the system operation does not ensure control of
priming, as defined in the User Instructions, and the
maximum permitted surface temperature of the T Class
could be exceeded it is recommended that users fit an
external surface temperature protection device.
2.5.7 Additional requirements for sump pumps
and vertical wet pit pumps with line shafts
Level control shall be fitted in the sump to prevent
liquid level dropping below minimum acceptable.
It is recommended that a Service Plan with vibration
monitoring is adopted. Alternatively the user should
fit external bearing housing surface temperature
protection device(s) to ensure the temperature class
(ie maximum surface temperature) is not exceeded.
For external flush the flow should be monitored.
2.6 Preventing the build up of explosive
mixtures
ENSURE PUMP IS PROPERLY FILLED AND
VENTED AND DOES NOT RUN DRY
Ensure the pump and relevant suction and discharge
pipeline system is totally filled with liquid at all times
during the pump operation, so that an explosive
atmosphere is prevented. In addition it is essential to
make sure that seal chambers, auxiliary shaft seal
systems and any heating and cooling systems are
properly filled.
If the operation of the system can not avoid this
condition it is recommended that you fit an
appropriate dry run protection device (eg liquid
detection or a power monitor).
To avoid potential hazards from fugitive emissions of
vapour or gas to atmosphere the surrounding area
must be well ventilated.
2.7 Preventing sparks
To prevent a potential hazard from mechanical
contact, the coupling guard must be non-sparking.
To avoid the potential hazard from random induced
current generating a spark, the earth contact on the
baseplate must be used.
Avoid electrostatic charge. Do not rub non-
metallic surfaces with a dry cloth; ensure the cloth is
damp.
The coupling must be selected to comply with
94/9/EC and correct alignment must be maintained.
2.7.1 Additional requirements for metallic pumps
on non-metallic baseplates
When metallic components are fitted on a non-
metallic baseplate they must be individually earthed.
2.8 Preventing leakage
2.8.1 Pumps with mechanical seal
The pump must only be used to handle liquids for
which it has been approved to have the correct
corrosion resistance.
Avoid entrapment of liquid in the pump and associated
piping due to closing of suction and discharge valves,
which could cause dangerous excessive pressures to
occur if there is heat input to the liquid. This can occur if
the pump is stationary or running.
Bursting of liquid containing parts due to freezing
must be avoided by draining or protecting the pump
and ancillary systems.
Where there is the potential hazard of a loss of a seal
barrier fluid or external flush, the fluid must be
monitored.
If leakage of liquid to atmosphere can result in a
hazard, the installation of a liquid detection device is
recommended.
2.8.2 Additional requirements for pumps with
magnetic drive
If protection greater than Categories 2 and M2 is
required, then liquid detection should be provided in
the bearing housing/support head.