SANDPIPER EB2-SM User Manual

SERVICE AND OPERATING MANUAL

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Model EB2-SM

Type 3

PLEASE NOTE!

The photos in this manual are for general instruction only. Your specific model
may not be shown. Always refer to the parts list and exploded view drawing for your
specific model when installing, disassembling or servicing your pump.

PRINCIPLE OF PUMP OPERATION

This ball valve pump is powered by compressed air and is a 1:1 pressure ratio
design. It alternately pressurizes the inner side of one diaphragm chamber, while
simultaneously exhausting the other inner chamber. This causes the diaphragms,
which are connected by a common rod, to move endwise. Air pressure is applied
over the entire surface of the diaphragm, while liquid is discharged from the opposite
side. The diaphragm operates under a balanced condition during the discharge
stroke, which allows the unit to be operated at discharge heads over 200 feet (61
meters) of water head.

Since the diaphragms are connected by a common rod, secured by plates to the
center of the diaphragms, one diaphragm performs the discharge stroke, while the
other is pulled to perform the suction stroke in the opposite chamber.

For maximum diaphragm life, keep the pump as close to the liquid being pumped
as possible. Positive suction head in excess of 10 feet of liquid (3.048 meters) may
require a back pressure regulating device. This will maximize diaphragm life.

Alternate pressuring and exhausting of the diaphragm chamber is performed by
means of an externally mounted, pilot operated, four-way spool type air distribution
valve. When the spool shifts to one end of the valve body, inlet air pressure is applied
to one diaphragm chamber and the other diaphragm chamber exhausts. When the
spool shifts to the opposite end of the valve body, the porting of chambers is re­versed. The air distribution valve spool is moved by an internal pilot valve which
alternately pressurizes one side of the air distribution valve spool, while exhausting
the other side. The pilot valve is shifted at each end of the diaphragm stroke by the
diaphragm plate coming in contact with the end of the pilot valve spool. This pushes
it into position for shifting of the air distribution valve.

The chambers are manifolded together with a suction and discharge check valve
for each chamber, maintaining flow in one direction through the pump.

IMPORTANT

Read these instructions completely,
before installation and start-up. It is the
responsibility of the purchaser to retain
this manual for reference. Failure to
comply with the recommendations
stated in this manual will damage the
pump, and void factory warranty.

WARNING

Take action to prevent static sparking.
Fire or explosion can result, especially
when handling flammable liquids. The
pump, piping, valves, containers or
other miscellaneous equipment must be
grounded.

BEFORE OPERATION

Before pump operation, inspect all
gasketed fasteners for looseness
caused by gasket creep. Retorque loose
fasteners to prevent leakage. Follow
recommended torques stated in the card
attached to the new pump.

WARNING

The weight of the air supply line and of
the filter must be supported by some
means other than the air valve cap.
Failure to provide support may result in
damage to the pump.

INSTALLATION & START-UP

Locate the pump as close to the product being pumped as possible, keeping
suction line length and number of fittings to a minimum. Do not reduce line size.

For installations of rigid piping, short flexible sections of hose should be installed
between pump and piping. This reduces vibration and strain to the piping system. A
Warren Rupp Tranquilizer
sation in flow.

This pump was tested at the factory prior to shipment and is ready for operation.
It is completely self-priming from a dry start for suction lifts of 20 feet (6.096 meters)
or less. For suction lifts exceeding 20 feet of liquid, fill the chambers with liquid prior
to priming.

AIR SUPPLY

Air supply pressures cannot exceed 125 psi (8.61 bar). Connect the pump air inlet
to an air supply of sufficient capacity and pressure required for desired performance.
When the air line is solid piping, use a short length of flexible hose (not less than ¾"
(19mm) in diameter) between pump and piping to eliminate strain to pipes.

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surge suppressor is recommended to further reduce pul-

Figure 1: Air Inlet

AIR INLET & PRIMING

For start-up, open an air valve approximately ½ to ¾ turn. After the unit primes,
an air valve can be opened to increase flow as desired. If opening the valve in-

WARREN RUPP, INC. A Unit of IDEX Corporation • P.O. Box 1568 • Mansfield, Ohio 44901-1568 USA • www.warrenrupp.com [phone] Fax [phone]

520-097-000 8/00 MODEL EB2-SM PAGE 1

creases cycling rate, but does not increase flow rate, cavitation has occurred, and
the valve should be closed slightly.

For the most efficient use of compressed air and the longest diaphragm life, throttle
the air inlet to the lowest cycling rate that does not reduce flow.

A NOTE ABOUT AIR VALVE LUBRICATION

The SandPiper pump’s pilot valve and main air valve assemblies are designed to
operate WITHOUT lubrication. This is the preferred mode of operation. There may be
instances of personal preference, or poor quality air supplies when lubrication of the
compressed air supply is required. The pump air system will operate with properly
lubricated compressed air supplies. Proper lubrication of the compressed air supply
would entail the use of an air line lubricator (available from Warren Rupp) set to
deliver one drop of 10 wt., non-detergent oil for every 20 SCFM of air the pump
consumed at its point of operation. Consult the pump’s published Performance Curve
to determine this.

It is important to remember to inspect the sleeve and spool set routinely. It should
move back and forth freely. This is most important when the air supply is lubricated.
If a lubricator is used, oil accumulation will, over time, collect any debris from the
compressed air. This can prevent the pump from operating properly.

Water in the compressed air supply can create problems such as icing or freezing
of the exhaust air causing the pump to cycle erratically, or stop operating. This can
be addressed by using a point of use air dryer to supplement a plant’s air drying
equipment. This device will remove excess water from the compressed air supply
and alleviate the icing or freezing problem.

AIR EXHAUST

If a diaphragm fails, the pumped liquid or fumes can enter the air end of the pump,
and be exhausted into the atmosphere. When pumping hazardous or toxic materials,
pipe the exhaust to an appropriate area for safe disposition.

This pump can be submerged if materials of construction are compatible with the
liquid. The air exhaust must be piped above the liquid level. Piping used for the air
exhaust must not be smaller than 1" (2.54 cm). Reducing the pipe size will restrict air
flow and reduce pump performance. When the product source is at a higher level
than the pump (flooded suction), pipe the exhaust higher than the product source to
prevent siphoning spills.

Freezing or icing of the air exhaust can occur under certain temperature and
humidity conditions. Use of an air dryer should eliminate most icing problems.

Figure 2: Ball check valve and seat.

Figure 3: Torquing the diaphragm plate.

BETWEEN USES

When used for materials that tend to settle out or transform to solid form, the pump
should be completely flushed after each use, to prevent damage. Product remaining
in the pump between uses could dry out or settle out. This could cause problems with
valves and diaphragms at re-start. In freezing temperatures, the pump must be
drained between uses in all cases.

CHECK VALVE SERVICING

Need for inspection or service is usually indicated by poor priming, unstable cy­cling, reduced performance or the pump’s cycling but not pumping.

Inspect the surfaces of both check valve and seat for wear or damage that could
prevent proper sealing. If pump is to prime properly, valves must seat air tight.

DIAPHRAGM SERVICING

Remove the eight bolts (four each side) securing the manifold assemblies to the
outer chambers. Remove the eight bolts securing the outer chamber to the inner
chamber. Remove the diaphragm assembly (outer plate, diaphragm, inner plate) by
turning the assembly counterclockwise using a 1" (2.54 cm) wrench on the outer
plate lugs. To disassemble the diaphragm assemblies, secure in a vise and turn the
outer plate counterclockwise using the 1” wrench.

Procedures for reassembling the diaphragms are the reverse of the above. The
diaphragms must be installed with their natural bulge to the outside, toward the outer
diaphragm plate. Install the inner plate with the flat face against the diaphragm.

After all components are in position in a vise and hand tight, tighten with a wrench
to approximately 40 ft. Ibs. (54.23 Newton meters) torque. After both diaphragm
assemblies have been assembled, thread one assembly into the shaft (hold the shaft
near the middle in a vise with soft jaws, to protect the finish). Install this sub assembly

Figure 4: Installed diaphragm.

CAUTION

If a diaphragm fails the pumped product
or fumes can enter the air side of the
pump. This side is exhausted through
the exhaust port (muffler).
When the product is a hazardous or
toxic material, the exhaust should be
piped to an appropriate area for safe
disposition.
When the product source is at a higher
level than the pump (flooded suction),
the exhaust should be piped to a higher
level than the product to prevent spills
caused by siphoning.

CAUTION

Before maintenance or repair, shut off
the compressed air line, bleed the
pressure, and disconnect the air line
from the pump. The discharge line may
be pressurized and must be bled of its
pressure. When the pump is used for
toxic or aggressive fluids, it should be
flushed clean prior to disassembly.

MODEL EB2-SM PAGE 2 520-097-000 8/00

into the pump and secure by placing the outer chamber on the end with the dia­phragm. This holds the assembly in place while the opposite side is installed. Torque
the last diaphragm assembly to 30 ft. Ibs. (40.67 Newton meters). This final torquing
will lock the diaphragm assemblies together. Place the remaining outer chamber on
the open end and loosely tighten the bolts. Replace the manifold assemblies to
square the flanges before final tightening of the remaining bolts.

ESADS: EXTERNALLY SERVICEABLE AIR DISTRIBUTION
SYSTEM

Please refer to the exploded view drawing and parts list in the Service Manual
supplied with your pump. If you need replacement or additional copies, contact your
local Warren Rupp Distributor. or the Warren Rupp factory Literature Department at
the number shown below To receive the correct manual, you must specify the MODEL
and TYPE information found on the name plate of the pump.

The main air valve sleeve and SpooI set Iist located in the valve body mounted on
the pump with four hex head capscrews. The valve body assembly is removed from
the pump by removing these four hex head capscrews.

With the valve body assembly off the pump, access to the sleeve and spool set is
made by removing four hex head capscrews (each end) on the end caps of the valve
body assembly. With the end caps removed, slide the spool back and forth in the
sleeve. The spool is closely sized to the sleeve and must move freely to allow for
proper pump operation. An accumulation of oil, dirt or other contaminants from the
pump’s air supply, or from a failed diaphragm, may prevent the spool from moving
freely. This can cause the spool to stick in a position that prevents the pump from
operating . If this is the case, the sleeve and spool set should be removed from the
valve body for cleaning and further inspection.

Remove the spool from the sleeve. Using an arbor press or bench vise (with an
improvised mandrel), press the sleeve from the valve body. Take care not to damage
the sleeve. At this point, inspect the o-rings on the sleeve for nicks, tears or abra­sions. Damage of this sort could happen during assembly or servicing. A sheared or
cut o-ring can allow the pump’s compressed air supply to leak or bypass within the air
valve assembly, causing the pump to leak compressed air from the pump air exhaust
or not cycle properly. This is most noticeable at pump dead head or high discharge
pressure conditions. Replace any of these o-rings as required or set up a routine,
preventive maintenance schedule to do so on a regular basis. This practice should
include cleaning the spool and sleeve components with a safety solvent or equiva­lent. Inspecting for signs of wear or damage, and replacing worn components.

To re-install the sleeve and spool set, lightly lubricate the o-rings on the sleeve
with an o-ring assembly lubricant or lightweight oil (such as 10 wt. air line lubricant).
Press the set into the valve body easily, without shearing the o-rings. Re-install one
end cap, gasket and bumper on the valve body. Using the ardor press or bench vise
that was used in disassembly, press the sleeve back into the valve body. You may
have to clean the surfaces of the valve body where the end caps mount. Material may
remain from the old gasket. Old material not cleaned from this area may cause air
leakage after reassembly. Take care that the bumper stays in place allowing the
sleeve to press in all the way. Reinstall the spool, the opposite end cap, gasket and
bumper on the valve body. After inspecting and cleaning the gasket surfaces on the
valve body and intermediate, reinstall the valve body on the pump using new gas­kets. Tighten the four hex head capscrews evenly and in an alternating cross pattern.

CAUTION

CAUTION: When removing capscrews
on suction or discharge valve retainer/
cap, make sure all pressure on suction
and discharge side of pump has been
relieved. Re-lock safety wire on the
capscrews before continuing use.

DANGER

Before doing any maintenance on the
pump, be certain all pressure is
completely vented from the pump,
suction, discharge, piping, and all other
openings and connections. Be certain
the air supply is locked out or made non­operational, so that it cannot be started
while work is being done on the pump.
Be certain that approved eye protection
and protective clothing are worn all
times in the vicinity of the pump. Failure
to follow these recommendations may
result in serious injury or death.

HAZARD WARNING

POSSIBLE EXPLOSION HAZARD can
result if 1, 1, 1,-Trichloroethane,
Methylene Chloride or other
Halogenated Hydrocarbon solvents are
used in pressurized fluid systems
having Aluminum or Galvanized wetted
parts. Death, serious bodily injury and/
or property damage could result.
Consult with the factory if you have
questions concerning Halogenated
Hydrocarbon solvents.

CAUTION

At time of installation, inspect all
external gasketed fasteners for
looseness caused by gasket creep.
Tighten loose fittings securely to
prevent leakage.

PILOT VALVE

This assembly is reached by removing the air distribution valve body from the
pump and lifting the pilot valve body out of the intermediate housing.

When reinserting an externally serviceable pilot valve, push both plungers out of
the path of the pilot valve so that they and the pilot valve are not damaged.

Service Note: If a problem arises with the pilot valve, it is usually corrected by
replacing only o-rings. Always grease the spool prior to inserting into the sleeve. If
the sleeve is removed from the body, reinsertion must be from the same side it was
removed from, the chamfered side. Again, grease the o-rings so that it slides into the
body. Make sure the retaining ring has securely been inserted around the sleeve.

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