WIL-10187-E-03
Wilden
®
12
Suggested Installation, Operation, Maintenance and Troubleshooting
The P8 pump has a 51 mm (2") inlet and 51 mm (2") outlet and is designed for flows
to 587 lpm (155 gpm). The P8 pump is manufactured with wetted parts of pure,
unpigmented PVDF or polypropylene. A variety of diaphragms and O-rings are
available to satisfy temperature, chemical compatibility, abrasion and flex concerns.
The suction pipe size should be at least 51 mm (2") diameter or larger if highly
viscous material is being pumped. The suction hose must be non-collapsible,
reinforced type as the P8 pump is capable of pulling a high vacuum. Discharge
piping should be at least 51 mm (2"); larger diameter can be used to reduce friction
losses. It is critical that all fittings and connections are airtight or a reduction or loss of
pump suction capability will result.
For P8 plastic models, Wilden offers 68 kg (150 lb) flanges. The following details
should be noted when mating these to pipe works:
•
A 60
–
80 shore gasket that covers the entire flange face should be used
•
The gasket should be between 1.91 mm (0.075") and 4.45 mm (0.175")
thickness
•
Mating flanges with flat as opposed to raised surfaces should be used for
proper mechanical sealing
•
The flanges should be tightened to aminimum of 6.8 N·m (5 ft-lb) but no
more than 13.5 N·m (10 ft-lb)
CAUTION:
All fittings and connections must be airtight. Otherwise, pump
suction capability will be reduced or lost.
Months of careful planning, study and selection efforts can result in unsatisfactory
pump performance if installation details are left to chance. You can avoid
premature failure and long-term dissatisfaction by exercising reasonable care
throughout the installation process
.
Location
Noise, safety and other logistical factors usually dictate where equipment will be
situated on the production floor. Multiple installations with conflicting
requirements can result in congestion of utility areas, leaving few choices for
additional pumps.
Within the framework of these and other existing conditions, every pump should
be located in such a way that several key factors are balanced against each
other to maximum advantage.
•
Access:
First of all, the location should be accessible. If it’s easy to
reach the pump, maintenance personnel will have an easier time
carrying out routine inspections and adjustments. Should major repairs
become necessary, ease of access can play a key role in speeding the
repair process and reducing total downtime.
•
Air Supply:
Every pump location should have an air line large enough to
supply the volume of air necessary to achieve the desired pumping rate.
Use air pressure up to a maximum of 8.6 bar (125 psig) depending on
pumping requirements.
For best results, the pumps should use a 5μ (micron) air filter, needle
valve and regulator. The use of an air filter before the pump will ensure
that the majority of any pipeline contaminants will be eliminated.
•
Solenoid Operation:
When operation is controlled by a
solenoid valve in the air line, three-way valves should be used.
This valve allows trapped air between the valve and the pump
to bleed off which improves pump performance. Pumping
volume can be estimated by counting the number of strokes
per minute and then multiplying the figure by the displacement
per stroke.
•
Muffler:
Sound levels are reduced below OSHA specifications
using the standard Wilden muffler. Other mufflers can be used
to further reduce sound levels, but they usually reduce pump
performance.
•
Elevation:
Selecting a site that is well within the pump’s
dynamic-lift capability will assure that loss-of-prime issues will
be eliminated. In addition, pump efficiency can be adversely
affected if proper attention is not given to site location.
•
Piping:
Final determination of the pump site should not be
made until the piping challenges of each possible location have
been evaluated. The impact of current and future installations
should be considered ahead of time to make sure that
inadvertent restrictions are not created for any remaining sites.
The best choice possible will be a site involving the shortest and
straightest hook-up of suction and discharge piping. Unnecessary
elbows, bends and fittings should be avoided. Pipe sizes should be
selected to keep friction losses within practical limits. All piping
should be supported independently of the pump. In addition, the
piping should be aligned to avoid placing stress on the pump fittings.
Flexible hose can be installed to aid in absorbing the forces created
by the natural reciprocating action of the pump. If the pump is to be
bolted down to a solid location, a mounting pad placed between the
pump and the foundation will assist in minimizing pump vibration.
Flexible connections between the pump and rigid piping will also
assist in minimizing pump vibration. If quick-closing valves are
installed at any point in the discharge system, or if pulsation within a
system becomes a problem, a surge suppressor (SD Equalizer
®
)
should be installed to protect the pump, piping and gauges from
surges and water hammer.
NOTE:
Materials of construction and elastomer material
have an effect on suction-lift parameters. Please refer to the
performance section for specifics.
When pumps are installed in applications involving flooded suction or
suction-head pressures, a gate valve should be installed in the
suction line to permit closing of the line for pump service.
For P8 pumps, a non-raised surfaced-flange adapter should be
utilized when mating to the pump’s inlet and discharge manifolds for
proper sealing.
Pumps in service with a positive suction head are most efficient
when inlet pressure is limited to 0.5
–
0.7 bar (7
–
10 psig). Premature
diaphragm failure may occur if positive suction is 0.7 bar (10 psig)
and higher.
The P8 will pass 6.4 mm (1/4") solids. whenever the possibility exists
that larger solid objects may be sucked into the pump, a strainer
should be used on the suction line.
CAUTION:
Do not exceed 8.6 bar (125 psig) air
supply pressure.
CAUTION: DO NOT EXCEED 8.6 BAR (125 PSIG) AIR SUPPLY
PRESSURE.
Section 6
