Flowserve VTP Wet Pit - Manual (Page 34)

VERTICAL TURBINE PUMPS (VTPS) CENTRIFUGAL PUMPS ENGLISH 71569224 – 10-13
Page 34 of 76 flowserve.com
Auxiliary piping 4.7.3
Drains 4.7.3.1
Normal pump leaks and gland leakage to be drained
through a separate piping arrangement or back into
the suction/sump.
Pumps fitted with gland packing 4.7.3.2
The pumped liquid is allowed to flow through the
gland packing at discharge pressure and drained out
of the pump or re-circulated back into the suction. A
separate flush supply may be required in some
cases. The piping plans and flush supply are to be
selected based on the application and operating
parameters.
In some special cases where the discharge pressure
exceeds 6.5 bar (100 psi) a special flushing plan is
recommended.
Pumps fitted with mechanical seals 4.7.3.3
Auxiliary piping to circulate the flushing liquid back
into the suction is required. In case of external clean
source requirements for pump applications such as
high temperature service, contaminated fluids,
oxidizing fluids, a special piping plan to carry the
clean liquid into the seal chamber with adequate
pressure is required and several piping plans are
available to suit the specific pump application.
See section 5.4 for Direction of
rotation before connecting motor to the power supply.
Final checks 4.7.4
After connecting the piping to the pump, rotate the
shaft several times by hand to ensure no pipe strain.
If pipe strain exists, correct piping.
Electrical Connections 4.8
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 IEC60079-14 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 5.4, Direction of rotation
before connecting the motor to the electrical supply.
Final Shaft Alignment Check 4.9
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.
Protection Systems 4.10
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 the
bearings, it is recommended that temperature and/or
vibration monitoring is done on a regular basis.