WDX USER INSTRUCTIONS ENGLISH 71576322 06-05
Page 21 of 46
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4.6.4 Discharge piping
See section 4.6.2 for typical pipework design.
A non-return valve should be located in the discharge
pipework to protect the pump from excessive back
pressure and hence reverse rotation when the unit is
stopped.
Pipework reducers should have a maximum total
angle of divergence of 9 degrees.
Fitting an isolation valve will alloweasier maintenance.
It should be installed downstream of the non-return
valve.
If needed a control pressure gauge may be installed
on the pipework.
Do not tighten the pipe flanges before the final check.
4.6.5 Auxiliary piping
4.6.5.1 Drains
Pipe pump casing drains and gland leakage to a
convenient disposal point.
4.6.5.2 Pumps fitted with mechanical seals
Single seals requiring re-circulation will normally be
provided with the auxiliary piping from pump casing
already fitted.
If the seal requires an auxiliary quench then a
connection must be made to a suitable source of
liquid flow, low pressure steam or static pressure from
a header tank. Recommended pressure is 0.35 bar (5
psi) or less. Check
General arrangement drawing
.
Special seals may require different auxiliary piping to
that described above. Consult separate User
Instructions and or Flowserve if unsure of correct
method or arrangement.
For pumping hot liquids, to avoid seal damage, it is
recommended that any external flush/cooling supply
be continued after stopping the pump.
4.6.6 Final checks
Check the tightness of all bolts in the suction and
discharge pipework. Tighten if necessary. Check also
the tightness of all foundation bolts. Tighten if
necessary. Check the tightness of all auxiliary piping.
Tighten if necessary.
4.7 Final shaft alignment check
After connecting piping to the pump, rotate the shaft
several times by hand to ensure there is no binding
and all parts are free.
Recheck the coupling alignment, as previously
described, to ensure no pipe strain. If pipe strain
exists, correct piping.
Alignment can only be considered definitive after
pipework has been connected.
4.8 Electrical connections
4.8.1 Safety conditions about electrical
connections
Electrical connections must be made
by a qualified Electrician in accordance with relevant
local national and international regulations. This
includes any grounding.
It is important to be aware of the EUROPEAN
DIRECTIVE on potentially explosive areas where
compliance with IEC60079-14 is an additional
requirement for making electrical connections.
Avoid mechanical, hydraulic or electrical
overload by using motor overload trips or a power
monitor and make routine vibration monitoring.
It is important to be aware of the EUROPEAN
DIRECTIVE on electromagnetic compatibility when
wiring up and installing equipment on site. Attention
must be paid to ensure that the techniquesused during
wiring/installation do not increase electromagnetic
emissions or decrease the electromagneticimmunity of
the equipment, wiring or any connected devices. If in
anydoubt, contact Flowserve for advice.
The motor must be wired up in
accordance with the motor manufacturer's
instructions (normally supplied within the terminal
box) including any temperature, earth leakage,
current and other protective devices as appropriate.
The identification nameplate should be checked to
ensure the power supply is appropriate.
A device to provide emergency stopping must
be fitted.
If not supplied pre-wired to the pump unit, the
controller/starter electrical details will also be supplied
within the controller/starter.
For electrical details on pump sets with controllers
see the separate wiring diagram.
See section 5.3,
Direction of rotation
before connecting the motor to the electrical supply.
