SANDPIPER EB1-SM User Manual

SERVICE AND OPERATING MANUAL

®

Model EB1-SM

Type 3

PRINCIPLE OF OPERATION

This ball check 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.

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 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.

®

surge suppressor is recommended to further reduce

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.

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.

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 3/4"
[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 & PRIMING

For start-up, open an air valve approximately 1/2 to 3/4 turn. After the unit primes,
an air valve can be opened to increase flow as desired. If opening the valve increases
cycling rate, but does not increase flow rate, cavitation has occurred, and the valve
should be closed slightly.

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

520-079-000 9/00 Model EB1-SM Type 3 Page 1

Air inlet

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 a Warren Rupp Air Dryer unit should eliminate most icing problems.

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 nuts securing the outer diaphragm chamber flange and remove the
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
25 ft. lbs. (33.90 Newton Meters). 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 assembling 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 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.

Before doing any maintenance on

DANGER

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 non-operational, 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 at all
times in the vicinity of the pump.
Failure to follow these recom­mendations may result in serious
injury or death.

Ball retainer

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.

Model EB1-SM Type 3 Page 2 520-079-000 9/00

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 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.

MODELS WITH 1" SUCTION/DISCHARGE OR LARGER, AND
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 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). Re-install
one end cap, gasket and bumper on the valve body. Using the arbor press or bench vise
that was used in disassembly,
without shearing the o-rings. 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. Re-install the spool,
opposite end cap, gasket and bumper on the valve body. After inspecting and cleaning
the gasket surfaces on the valve body and intermediate, re-install the valve body on the
pump using new gaskets. Tighten the four hex head capscrews evenly and in an
alternating cross pattern.

carefully press the sleeve back into the valve body,

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

520-079-000 9/00 Model EB1-SM Type 3 Page 3