Sundyne LMV-333, Инструкция по эксплуатации

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6
B. PUMP CONTROL DURING START-UP
Refer to Section “V. OPERATION AND
CONTROL” for more detail.
1. SINGLE UNITS
A. Start pump with the suction valve open
while throttling the discharge valve to bring
the pump to the design flow operating
point.
B. If the process fluid is near boiling, a seal
cavity vent back to the supply vessel may
have to be opened to fill the pump with
liquid.
2. PARALLEL OPERATION
Check valves must be placed in the discharge
piping of each pump to prevent back-flow. It is
advantageous to install separate bypass loops
around each pump for additional operational
flexibility.
A. Start first unit as described above for
single units.
B. Start second unit on bypass and maintain
flow. Open discharge valve on second unit
and maintain the design flow of both units.
It is preferable that the units not operate at
their peak head capability.
C. Separate flow controls on each pump are
recommended and provide a lower
minimum flow range than can be achieved
by pressure control.
C. CRITICAL START-UP CHECK LIST
1. KNOW YOUR MACHINE
Prior to servicing and start-up of the Sundyne
pump, carefully review the specification sheet,
outline drawing, performance curves, and the
instruction manual. It is important you become
familiar with the pump configuration before
starting and operating the pump.
2. DRIVER INSTRUCTIONS
Follow installation and starting instructions of
the driver manufacturer.
3. GEARBOX SERVICING
Fill gearbox to the top of the black circle in the
sight glass with lube oil which conforms to the
specifications in Figure 3. Operate auxiliary
lube pump to fill heat exchanger and filter. Add
oil as necessary, approximately seven U. S.
quarts (6.6 liters) through fill fitting until oil
level stabilizes in sight glass.
4. ENVIRONMENTAL CONTROL SYSTEM
Install seal environmental control system, if
required, and drain piping.
5. PRESSURIZE FLUID LOOP
Pressurize double seal buffer loop or external
seal flush, if required, prior to admitting fluid
into pump casing.
6. MOTOR ROTATION
Rotation must be in same direction as arrow
stamped on pump casing.
7. START PUMP
Start pump with suction valve completely open
while throttling discharge valve, to bring pump
to design operating point.
8. HEAT EXCHANGER
Adjust cooling flow to maintain gearbox sump
temperature of 140° to 200°F (60° to 93°C).
9. CHECK
Check total head, flow rate, and power
consumption against pump specification
sheet. Check that specific gravity, viscosity
and NPSH are in accordance with
specification sheet. These conditions will
significantly alter performance of the pump.
10. DIFFUSER CAVITY VENT
Ensure diffuser cavity vent is open. (Plug must
be removed).
Note: Process fluid may accumulate causing
a potentially hazardous situation if
diffuser cavity vent is not properly
vented.