ITT Industries Flygt 3067, Installation, Care And Maintenance

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5
GENERAL DESIGN OF A FLYGT PUMP
Design
The pump is a submersible, electric motor-driven
product.
1. Impeller
The pump is available with a wide range of impellers
for different applications and capacities.
2. Shaft seals
The pump has two mechanical face seals, one inner
and one outer, with an intermediate oil housing.
3. Shaft
The shaft is delivered with the rotor as an integral part.
Shaft material: stainless steel.
4. Bearings
The bearings of the shaft consist of single-row ball
bearings.
5. Oil housing
The oil lubricates and cools the seals and acts as a
buffer between the pump housing and the electric
motor.
6. Motor
Squirrel-cage 1-phase or 3-phase induction motor for
50 Hz or 60 Hz.
The motor can be started by direct on-line or star-delta
starting.
The motor can be run continuously or intermittently
with a maximum of 15 evenly spaced starts per hour.
Flygt motors are tested in accordance with IEC 34-1.
The stator is insulated in accordance with class F
(155°C, 310°F). The motor is designed to deliver its
rated output at ± 5% variation from the rated voltage.
Without overheating the motor, ± 10% variation from
the rated voltage can be accepted provided that the
motor does not run continuously at full load. The
motor is designed to operate at a voltage imbalance
of up to 2% between the phases.
Monitoring equipment
The stator incorporates thermal contacts connected in
series.
The pump can be equipped with a sensor (FLS) for
sensing water in the stator housing (not applicable
to Ex-approved pumps).