ITT Goulds Pumps 3755, Инструкция по установке, эксплуатации и обслуживанию

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4 Starting Pump
4.1 Priming
The pump must always be fully primed, all air removed and the suction pipe full of liquid, before pump is
started.
If the pump is run dry, the rotating parts within the pump may gall and seize to the stationary parts as
they depend on liquid being pumped for lubrication.
4.2 Adjustment of stuffing box gland
With pump running at rated speed, stuffing box glands can be adjusted. Draw gland nuts up evenly and
only one-sixth of a turn at a time, allowing sufficient time between adjustments for the packing to adjust
itself and the effect on the leakage to be observed. If any sign of heating is evident, shut off the pump
and allow the boxes to cool. Several starts may be necessary before the boxes run cool. Do not back off
the gland nuts on a hot box as this will usually result in liquid leaking between the outer edge of the pack-
ing and the stuffing box bore. It must be borne in mind that it takes newly-installed packing
some time to "run in" and that during this period, frequent attention and careful adjustments are necessa-
ry. See Stuffing box for final adjustments of gland.
4.3 Alignment - final
Final alignment can only be accomplished after unit has been run under actual operating conditions for a
sufficient length of time to bring the unit up to operating temperatures.
After this warm-up period has elapsed, stop the unit and immediately and check the coupling alignment.
Follow the alignment procedure as outlined in 2.3 Alignment - initial on page 11 , with the exception of
Step 5. which allows for "growth" of the parts due to temperature difference between the driver and the
pump. At the operating temperature, the unit will be in correct horizontal and vertical parallel alignment
when a straight edge rests evenly on both halves of coupling rims at four points 90° apart.
As cautioned in 2.3 Alignment - initial on page 11 Step 6., changing alignment in one direction may alter
the alignment in another. Check through each alignment procedure after making any alignment change.
4.4 Doweling
Doweling is not required on these pumps. Patented lock washers are furnished which hold the pump and
driver feet securely in place.
4 Starting Pump
Model 3755 Installation, Operation, and Maintenance Manual 21