CS USER INSTRUCTIONS ENGLISH 923CSE001 - 08/03
Page 7 of 66
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CLEANNESS
Oil, grease, and liquids leaks may make slippery
surfaces and ground, assure removal of these leaks
when servicing the unit.
Machine maintenance must always begin and finish
by cleaning the ground and the external surfaces of
the machine.
TOOLS
Tooling must be suitable and have appropriated size
for the task being performed (see 6.13)
Tools handing should be in accordance with their
user instructions
HOT (and cold) PARTS
If hot or freezing components or auxiliary heating
supplies can present a danger to operators and
persons entering the immediate area action must be
taken to avoid accidental contact. If complete
protection is not possible, the machine access must
be limited to maintenance staff only, with clear visual
warnings and indicators to those entering the
immediate area. Note: bearing housings must not be
insulated and drive motors and bearings may be
hot.
If the temperature is greater than 68 °C (175 °F)
or below 5 °C (20 °F) in a restricted zone, or
exceeds local regulations, action as above shall
be taken.
1.6.4 Products used in potentially explosive
atmospheres
Measures are required to:
• Avoid excess temperature
• Prevent build up of explosive mixtures
• Prevent the generation of sparks
• Prevent leakages
• Maintain the pump to avoid hazard
The following instructions for pumps and pump units
when installed in potentially explosive atmospheres
must be followed to help ensure explosion
protection. Both electrical and non-electrical
equipment must meet the requirements of European
Directive 94/9/EC.
1.6.4.1 Scope of compliance
Use equipment only in the zone for which it is
appropriate. Always check that the driver, drive
coupling assembly, seal and pump equipment are
suitably rated and/or certified for the classification of
the specific atmosphere in which they are to be
installed.
Where Flowserve has supplied only the bare shaft
pump, the Ex rating applies only to the pump. The
party responsible for assembling the pump set shall
select the coupling, driver and any additional
equipment, with the necessary CE Certificate/
Declaration of Conformity establishing it is suitable
for the area in which it is to be installed.
The output from a variable frequency drive (VFD)
can cause additional heating affects in the motor
and so, for pumps sets with a VFD, the ATEX
Certification for the motor must state that it is
covers the situation where electrical supply is from
the VFD. This particular requirement still applies
even if the VFD is in a safe area.
1.6.4.2 Marking
An example of ATEX equipment marking is shown
below. The actual classification of the pump will be
engraved on the nameplate.
1.6.4.3 Avoiding excessive surface
temperatures
ENSURE THE EQUIPMENT
TEMPERATURE CLASS IS SUITABLE FOR THE
HAZARD ZONE
Pumps have a temperature class as stated in the
ATEX Ex rating on the nameplate. These are based
on a maximum ambient of 40 °C (104 °F); refer to
Flowserve for higher ambient temperatures.
The temperature of the liquid handled influences
the surface temperature on the pump. The
maximum permissible liquid temperature depends
on the temperature class and must not exceed the
values in the table that follows.
The temperature rise at the seals and bearings and
due to the minimum permitted flow rate is taken into
account in the temperatures stated.
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