Flowserve WDX - Manual (Page 6)

WDX USER INSTRUCTIONS ENGLISH 71576322 06-05
Page 6 of 46
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HAZARDOUS LIQUIDS
When the pump is handling hazardous liquids care must
be taken to avoid exposure to the liquid by appropriate
sitting of the pump, limiting personnel access and by
operator training. If the liquid is flammable and/or
explosive, strict safety procedures must be applied.
Gland packing must not be used when pumping
hazardous liquids.
PREVENT EXCESSIVE EXTERNAL
PIPE LOAD
Do not use pump as a support for piping. Do not mount
expansion joints, unless allowed by Flowserve in
writing, so that their force, due to internal pressure,
acts on the pump flange.
ENSURE CORRECT LUBRICATION
(See section 5, Commissioning, startup, operation and
shutdown.)
START THE PUMP WITH OUTLET
VALVE PART OPENED
(Unless otherwise instructed at a specific point in the
User Instructions.)
This is recommended to minimize the risk of
overloading and damaging the pump motor at full or
zero flow. Pumps may be started with the valve further
open only on installations where this situation cannot
occur. Pump outlet valve shall may need to be
adjusted to comply with the duty following the run-up
process. (See section 5, Commissioning start-up,
operation and shutdown.)
NEVER RUN THE PUMP DRY
INLET VALVES TO BE FULLY OPEN
WHEN PUMP IS RUNNING
Running the pump at zero flow or below the
recommended minimum flow continuously will cause
damage to the seal.
DO NOT RUN THE PUMP AT
ABNORMALLY HIGH OR LOW FLOW RATES
Operating at a flow rate higher than normal or at a flow
rate with no backpressure on the pump may overload
the motor and cause cavitations. Low flow rates may
cause a reduction in pump/bearing life, overheating of
the pump, instability and cavitations/vibration.
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 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 VFDis in a safe area.