SANDPIPER EB1 1-2-SM User Manual

SERVICE AND OPERATING MANUAL

®

Models EB1½ -SM

Type 1

PLEASE NOTE!

The photos shown 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 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.

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.

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
pulsation 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 on suction lifts. Some suction lift
conditions may require filling the chambers with liquid prior to priming.

®

surge suppressor is recommended to further reduce

AIR SUPPLY

Air supply pressures cannot exceed 100 psi (6.89 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. Use of a Warren Rupp Filter/Regulator in the air line is recommended.

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 increases

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

520-096-000 8/00 Model EB1½ -SM Type 1 Page 1

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.

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. Check
exhaust muffler regularly for build-up of ice or contaminants.

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.

Remove the six bolts securing the manifold(s). Inspect the surfaces of both
check valves and seat for wear or damage that could prevent proper sealing. If
pump is to prime properly, valves must seat air tight.

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.

Exhaust muffler.

DIAPHRAGM SERVICING

Remove the twelve bolts (six each side) securing the manifold assemblies to the
outer chambers. Remove the eight bolts securing the outer chamber to the inner
chamber. Loosen the capscrew securing the diaphragm and plate to the rod by
leaving the diaphragm engaged with the capscrews around the outer flange,
preventing rotation of the rod. DO NOT USE A WRENCH ON THE DIAPHRAGM
ROD. FLAWS ON THE SURFACE MAY DAMAGE BEARINGS AND SEAL.

During reassembly make certain that the rubber bumper is on the rod on each
side. Install the diaphragm with the natural bulge outward as indicated on the
diaphragm. Install the heavier plate on the outside of the diaphragm and make
certain that the large radius side of both plates are toward the diaphragm. Place the
sealing washer between the inner diaphragm plate and the end of the rod. Tighten
the capscrew to approximately 350 in./lbs. (40.67 Newton Meters), 450 in./lbs. for
TGN-SS. Torque while allowing diaphragm to turn freely with plates. Except for
EPDM rubber, use a lightweight oil between plates and diaphragm when doing this
procedure. Use a wrench on the capscrew of the opposite side to keep the rod from
rotating. If the opposite chamber is assembled, the rod need not be held.

When reassembling the outer chambers and the manifold, the bolts securing the
manifold flange to the chamber should be snugged prior to tightening the chamber
bolts, to insure that the chamber port flange is square with the manifold flange.
Finish tightening the manifold flange bolts after chamber bolting is secured.

A NOTE ABOUT AIR VALVE LUBRICATION

The SandPiper pump’s pilot 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.

Ball check valve.

Diaphragm installation.

Model EB1½-SM Type 1 Page 2 520-096-000 8/00

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.

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 of 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.

Models with 1" suction/discharge or larger and NON-METAL center sections

The main air valve sleeve and spool set is 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 a retaining ring (each end) securing the end cap on 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).
Re-install one end cap, and retaining ring on the valve body. Using the arbor press
or bench vise that was used in disassembly,

carefully press the sleeve back into the
valve body, without shearing the o-rings. Re-install the spool, opposite end cap and
retaining ring 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, at 150 in./lbs. (16.94 Newton meters).

PILOT VALVE

The pilot valve assembly is accessed by removing the main air distribution valve

body from the pump and lifting the pilot valve body out of the intermediate housing.

Most problems with the pilot valve can be corrected by replacing the o-rings.
Always grease the spool prior to inserting it into the sleeve. If the sleeve is removed
from the body, reinsertion must be at the chamfered side. Grease the o-rings to
slide the sleeve into the valve body. Securely insert the retaining ring around the
sleeve. When reinserting the pilot valve, push both plungers (located inside the
intermediate bracket) out of the path of the pilot valve spool ends to avoid damage.

RECOMMENDED WARREN RUPP
ACCESSORIES TO MAXIMIZE
PUMP PERFORMANCE:

• Tranquilizer® Surge Suppressor.
For nearly pulse-free flow.

• WarrenRupp Filter/Regulator.
For modular installation and
service convenience.

• Warren Rupp Speed Control. For
manual or programmable process
control.Manual adjustment or
4-20mA reception.

For more detailed information on these
accessories, contact your local Warren
Rupp Factory-Authorized Distributor, or
Warren Rupp corporate headquarters.

Pilot valve spool and o-rings.

Bushings and o-rings.

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 this
manual

PILOT VALVE ACTUATOR

Bushings for the pilot valve actuators are held in the inner chambers with retaining

rings. An o-ring is behind each bushing. If the plunger has any sideways motion,

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