Flowserve WMV IDP - Manual (Page 13)

WMV, WMVS USER INSTRUCTIONS ENGLISH 26999970 10-12
Page 13 of 28
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d) With modulating control a continuous by-pass,
controlled by an orifice, should be incorporated.
The by-pass should preferably be connected to the
top of the pump (remove and discard the air relief
valve) and piped back to the suction source. The
recommended orifice size is given below.
e) Do not operate the pump on closed valve for more
than 1 to 2 minutes. Where there is a risk of
prolonged operation at closed valve a continuous
by-pass should be incorporated:

For 5 and 8WMV 2 900 rpm pumps:
2.5 mm (0.1 in.) diameter orifice,
12 mm (0.5 in.) minimum bore pipe.

For 16WMV 2 900 rpm pumps:
4 mm (0.16 in.) diameter orifice,
20 mm (0.75 in.) minimum bore pipe.
4.5.4 Flange loads
The permissible flange loading is dependent on a
number of factors such as dimensions, flange rating,
pressure, temperature, material, pump configuration
etc. The recommendations contained in the section on
pipework connections should be followed to eliminate
these loads.
When requested the permissible flange loading will
have been supplied separately to the purchaser and
should be obtained and retained with this manual. If in
doubt contact Flowserve for information.
4.5.5 Auxiliary piping
The connections that are to be piped
up will have been fitted with protective metal or
plastic plugs which will need to be removed.
Pumps fitted with mechanical seals - the conical design
of the single internal seal housing provides excellent
liquid circulation around the seal and will not normally
require a separate flush.
4.5.6 Final checks
After connecting piping to the pump, rotate the shaft
several times by hand to ensure there is no binding and
all parts are free.
Check the torque of all bolts in the suction and
discharge pipework. Check also the torque of all
foundation bolts.
4.6 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 IEC60079-14 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 5.2, Direction of rotation,
before connecting the motor to the electrical supply.
4.7 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 any 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, install a protection
device 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, fit a
power monitor to stop the pump or prevent it from
being started. This is particularly relevant if the pump
is handling a flammable liquid.