From On-Line Operation To Hot Standby; Hydraulic, Mechanical And Electrical Duty; 5.10.1 Pump Flow - Flowserve WIK Series User Instructions

heat exchangers, seal housings, and driver. To
determine cooling systems that are applicable to
your pump see section 8 and piping drawings in
the back of this manual, and your plant's data
files.)
5) Close off valves in seal flush system, as
applicable. (To determine systems that are
applicable to your pump, see section 8 and
piping drawings in the back of this manual, and
your plant's data file.)
To open drain valves in the cooling water
system of the lube oil console, see the lube oil
console manufacturer's instructions and drawings in
section 10.
When venting or draining pumps which
contain toxic, flammable, and/or high
temperature fluids, ensure that the vented or
drained fluid is piped to a safe collector that will
prevent release of the fluid into the surrounding
area. Failure to do so can result in equipment
damage, personnel injury, or death.
6) If a prolonged shutdown and temperature below
0°C (32°F) is anticipated, open all valves in drain
lines and verify that cooling water systems, seal
flush system, and case are drained. (To identify
drains besides those on lube oil console, see
section 8 and piping drawings in the back of this
manual, and your plant's data file.)
Cold water should not be circulated
through the lube oil cooler or bearing jackets of an
idle pump.
7) Leave valves in minimum flow and balance
chamber leak-off lines open, when practical (see
your plant's data file).
8) Leave suction valve open, when practical,
thereby assuring that low-pressure end of case
will not be damaged by an unintentional reverse
flow.
5.9.2

From on-line operation to hot standby

A pump on hot standby should be put on line (see
section 5.7) once every 2 weeks for 1 to 2 hours to
check its operation. To assure that the pump
operating with flow at a temperature of 121°C
(250°F) and above can be put back on the line
without delaying for warm-up, proceed as follows:
WIK USER INSTRUCTIONS ENGLISH BO2662 5/09
1) See that valves in minimum flow circuit (see you
plant's data file) are open, then close discharge
valve (or place discharge valve in bypass).
2) Cut power to driver; recommended procedure
for turbine unit is to stop turbine by tripping
emergency overspeed trip.
3) See that suction valve remains open.
4) After rotation stops, reopen the discharge valve
and verify if check valve is tightly closed by
watching for reverse rotation.
5) Leave following valves in the positions given:
a) Valves in cooling water circuit as furnished
to applicable units: heat exchanger, seal
housing, driver, etc.: OPEN. (To determine
cooling systems that are applicable to your
pump, see Outline and Piping drawings in
the back of this manual, and your plant's
data files.)
b) Valve in pump vent line, when line is
installed: OPEN
c) Valves in drain lines, except any functioning
as part of warm-up circuit CLOSED
6) Leave valves in minimum flow and balance
chamber leak-off lines open.
7) Operate spare or auxiliary lube oil pump (see
lube oil console manufacturer's instructions in
Section 10).
8) Verify that valves in warm-up circuit are open.
To permit pump to cool off and be taken
out of service when in hot standby, close warm-up
circuit and stop lube oil flow when the case
temperature drops below 38°C (100°F).
5.10

Hydraulic, mechanical and electrical duty

The following discussions are focused on the
principles that underlie the operation of your pump.
Where figures are not included with the text, see the
pump assembly drawing and schematics in the back
of this manual, which also provide pictorial support
of the text.

5.10.1 Pump flow

Since the impellers in your pump are in series and
all face in the same direction, the flow of liquid
through the pump is in one direction, through each
stage in turn. Pressure is added at each stage and
the pressure at the last stage is the discharge
pressure for which the pump is designed. Liquid
enters the suction impeller through the inlet at the
center. The rotation of the impeller imparts energy to
the liquid causing it to be thrown outward at high
velocity into the multi-vane diffuser surrounding the
impeller. The energy in the liquid as it leaves the
impeller appears as velocity that is converted into
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