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4. OPERATION AND USE
SEAL
- Gland packing seal. (Fig. 11)
To assure effective liquid containment, the gland packing seal requires correct regu-
lation.
CAUTION!
All regulation operations must take place with pump stopped.
Gland packing regulation must be such as to allow for continuous dripping of the
liquid outside.
Lubrication and cooling of the inner rings is assured only in this way.
The amount of dripping depends on pump size and pressure in the stuffing box.
Upon first starting up keep the gland loose so that the liquid may drip copiously.
After the pump has reached full speed conditions, stop and progressively tighten the
nuts of the gland. repeat the operation until achieving
a slight continuous dripping.
After starting up, dripping must be regularly checked and if necessary act on the
gland.
Should it be no longer possible to adjust dripping, the gland packing rings must be
replaced.
MOTOR ABSORPTION
With the pump operating at rated speed, current absorption must not exceed the
electrical motor rated value.
The power absorbed by the motor may be deduced through the operating curve, the
head developed by the pump being known.
The absorbed power must be lower than the motor rated one.
MINIMUM FLOW RATE
!
CAUTION
Prolonged operation with null flow rate may damage the pump.
The pump requires a minimum operation flow rate to dissipate the heat generated
inside the body during operation (minimum 20% of the maximum yield flow rate).
Braided gasket
Gland packing seal
11
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