Flowserve Gearex Rotary Gear Pumps External and Internal Bearing - Manual (Page 27)

EXTERNAL GEAREX USER INSTRUCTIONS ENGLISH 71569246 (2167B-E1)
Flowserve Pump Division 27
®
should be piped back to the suction tank and not to
the suction line.
4.7.5 Auxiliary piping
4.7.5.1 Drains
Pipe pump casing drains and gland leakage to a
convenient disposal point.
4.7.5.2 Pumps fitted with gland packing
When suction pressure is below ambient pressure it is
necessary to feed the gland packing with liquid to
provide lubrication and prevent the ingress of air. This
is normally achieved with a supply from the pump
discharge volute to the stuffing box. A control valve is
fitted in the line to enable the pressure to the gland to
be controlled.
If the pumped liquid is dirty and cannot be used for
sealing, a separate clean compatible liquid supply to
the gland at 1 bar (15 psi) above suction pressure is
recommended.
4.7.5.3 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.
4.7.6 Final checks
Check the tightness of all bolts in the suction and
discharge pipework. Check also the tightness of all
foundation bolts.
4.8 Pressure gauges
It is recommended that suitable suction and discharge
pressure gauges be provided. Pressure readings are
essential to resolving operational problems and are
useful for monitoring pump performance.
4.9 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.
4.10 Electrical connections
4.10.1 Electrical connections must be
made by a qualified Electrician in accordance with
relevant local national and international regulations.
4.10.2 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.
4.10.3 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.
4.10.4 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.
4.10.5 A device to provide emergency stopping
must be fitted.
4.10.6 If not supplied pre-wired to the pump unit, the
controller/starter electrical details will also be supplied
within the controller/starter.
4.10.7 For electrical details on pump sets with
controllers see the separate wiring diagram.
4.10.8 See section 5.3 Direction of
rotation before connecting the motor to the electrical
supply.