5
B1d.1
4/06
Supercedes 8/05
PACOPACO
PACOPACO
PACO
PUMPS
• Install a valve in the suction line to isolate the
pump during shutdown and maintenance.
• Valves should always be installed in positions
that avoid air pockets. Globe valves should
not be used,particularly when NPSH is critical.
• During pumping operation, valves on the suction line
must always be at FULL OPEN.
• Pressure gauges properly sized for the range of
operation, should be installed in gauge taps on the
pump suction and discharge nozzles.
I. DISCHARGE (OUTLET) PIPING
• Short discharge piping can be the same diameter as
the pump discharge opening. Longer piping should
be one or two sizes larger depending on length.
• Any high points in discharge piping may entrap air or
gas and thus retard pump operation. Air vents or
bleed valves as a means to release entrapped air
are recommended.
• An even gradient is best for long horizontal runs of
discharge piping.
• Install a valve near the pump discharge opening
to prime and start the pump. The discharge valve is
also used to isolate the pump during shutdown and
maintenance.
J. SHAFT SEALING-GENERAL COMMENTS
• PACO offers both mechanical seals and packed
stuffing boxes as a means to seal the shaft. Pumps
with stuffing boxes are normally packed before ship-
ment. If the pump is installed within 60 days after
shipment, the packing material will be in good condi-
tion for operation with a sufficient supply of lubrica-
tion. If the pump is stored for a longer period, it may
be necessary to repack the stuffing boxes (see Pack-
ing Replacement, Page 11, to repack the boxes).
• The stuffing box must be supplied at all times with a
source of clean, clear liquid to flush and lubricate the
packing (see Packing Replacement, Page 11). When
pumps are equipped with mechanical seals, no main-
tenance or adjustment is required.
K. GLAND ADJUSTMENT
• Make sure the flushing fluid lines are connected
and their valves are open. After pump start-up, with
the pump running,the packing gland should be ad-
justed to permit 40 or 60 drops per minute leakage,
this is required for shaft sleeve lubrication.
FIGURE 3a:
Suction Piping (Eccentric vs. Concentric).
FIGURE 4a: Suction Piping (Avoid high points).
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