Flowserve FRBHJC - Manual (Page 23)

FRBHJC USER INSTRUCTIONS ENGLISH 71569179 11-04
Page 23 of 42
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4.7.2 Suction piping
a) Drop pipes may be used to extend the pump
setting yet maintain cantilever design. All designs
are reviewed for shaft deflection and critical
speeds.
b) Inlet strainers, when used, should have a net `free
area' of at least three times the inlet pipe area.
4.7.3 Discharge piping
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 15 degrees. Fitting an isolation
valve will allow easier maintenance.
4.7.5 Final checks
Check the tightness of all bolts in the suction and
discharge pipework. Check also the tightness of all
foundation bolts.
4.8 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.
4.9 Electrical connections
4.9.1 Electrical connections must be
made by a qualified Electrician in accordance with
relevant local national and international regulations.
4.9.2 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.
4.9.3 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
techniques used during wiring/installation do not
increase electromagnetic emissions or decrease the
electromagnetic immunity of the equipment, wiring or
any connected devices. If in any doubt contact
Flowserve for advice.
4.9.4 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.
4.9.5 A device to provide emergency stopping
must be fitted.
4.9.6 If not supplied pre-wired to the pump unit, the
controller/starter electrical details will also be supplied
within the controller/starter.
4.9.7 For electrical details on pump sets with
controllers see the separate wiring diagram.
4.9.8 See section 5.3, Direction of
rotation before connecting the motor to the electrical
supply.
4.10 Protection systems
The following protection systems are
recommended particularly if the pump is installed in a
potentially explosive area or is handling a hazardous
liquid. If in doubt consult Flowserve.
If there is any possibility of the system allowing the
pump to run against a closed valve or below minimum
continuous safe flow a protection device should be
installed to ensure the temperature of the liquid does
not rise to an unsafe level.
If there are any circumstances in which the system
can allow the pump to run dry, or start up empty, a
power monitor should be fitted to stop the pump or
prevent it from being started. This is particularly
relevant if the pump is handling a flammable liquid.
If leakage of product from the pump or its associated
sealing system can cause a hazard it is recommended
that an appropriate leakage detection system is
installed.
To prevent excessive surface temperatures at
bearings it is recommended that temperature or
vibration monitoring are carried out. See sections
5.7.4 and 5.7.5.