Flowserve MNV - Manual (Page 21)

MNV & MNZ USER INSTRUCTIONS ENGLISH 71569188 11/04
Page 21 of 47
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4.6.4 Auxiliary piping
4.6.4.1 Drains
Pipe pump casing drains and gland leakage to a
convenient disposal point.
4.6.4.2 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.
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.
4.6.4.3 Pumps fitted with mechanical seals
Single seals requiring re-circulation will normally be
provided with the auxiliary piping from pump casing
already fitted.
Special seals may require different auxiliary piping to
that described above. Consult seal 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
4.6.5 Final checks
Check the tightness of all bolts in the suction and
discharge pipe work. Check also the tightness of all
foundation bolts.
4.7 Electrical connections
Electrical connections must be made
by a qualified Electrician in accordance with relevant
local national and international regulations.
It is important to be aware of the EUROPEAN
DIRECTIVE on potentially explosive areas where
compliance with IEC60079-4 is an additional
requirement for making electrical connections.
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.
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.
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 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 on a regular
basis.