SANDPIPER SH2-M User Manual
SERVICE AND OPERATING MANUAL
II 2GD T5
II 2G c T5
Model EH2-M & SH2-M
II 3/2 G c T5
PRINCIPLE OF OPERATION
This pump is a 2:1 pressure ratio single acting pump powered by compressed air.
The 2:1 ratio is achieved by simultaneously applying air pressure over a single end
of each of two pistons connected in series by a shaft. The two pressurized ends are
those most distant from the pumped uid, with the force from the air pressure exerted
in the direction of the pumped uid. The combined force is transferred through to the
single end of the piston nearer to the pumped uid—the single piston end having an
area equal to one-half that of the two “air” ends—and then through a uid cell to a
single pumping diaphragm.
On this single acting pump the suction stroke is independent of all discharge
conditions and requires less air pressure than the discharge stroke. The suction
stroke is accomplished through an air regulator which pressurizes the piston area
in the rear cylinder adjacent to the intermediate bracket, while simultaneously
exhausting the other two piston areas: one in the front cylinder, adjacent to the
intermediate bracket, and the other behind the rear cylinder piston, adjacent to the
cap end.
OPERATION
The regulator is factory preset to 30 psi. After the pump is installed and in
operation, the operator should raise or lower the setting until maximum
performance is determined by trial and error. A setting which is too high will result
in excessively rapid and noisy operation, with a loss in performance and eventually
shortened pump life.
The hose assemblies deliver air to the non-wetted portions of the pump, and care
should be taken that they are neither crimped nor cut.
INSTALLATION PROCEDURES
Position the pump as close as possible to the source of the liquid to be pumped.
Avoid long or undersize suction lines and use the minimum number of ttings.
For permanent installation involving rigid piping, install short exible sections
of hose between the pump and piping. This reduces strains and permits easier
removal of the pump for service when required.
AIR SUPPLY
Do not connect the unit to an air supply in excess of 125 PSI (8.61 bars).
Install a shutoff valve in the air supply line to permit removal of the unit for servicing. When connecting an air supply of rigid piping, mount a section of exible line
to the pump to eliminate piping strain. In permanent installations, an air line lter is
recommended.
FREEZING OR ICING OF EXHAUST
Icing of the air exhaust can occur under certain conditions of temperature and
humidity on compressed air power equipment. Icing is more likely to occur at
high discharge pressures. Use of the Warren Rupp Air Dryer should eliminate the
problem.
MAINTENANCE AFTER USE
When the pump is used for materials that tend to settle out or transform from liquid
to solid form, care must be taken after each use or during idle time to remove them
and ush the pump as required to prevent damage. In freezing temperatures the pump
must be completely drained when idle. This model must be tilted to allow the liquid
from the chambers to run out of the discharge port.
Warren Rupp, Inc. • A Unit of IDEX Corporation • 800 N. Main St., Manseld, Ohio 44902 USA
Telephone (419) 524-8388 • Fax (419) 522-7867 • warrenrupp.com
HIGH PRESSURE DUTY Type 4
IMPORTANT
Read these safety
warnings and
instructions in this
manual completely,
before installation and start-up of the pump.
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.
CAUTION
Before pump
operation, inspect all
gasketed fasteners
for looseness caused
by gasket creep.
Re-torque loose fasteners to prevent
leakage. Follow recommended torques
stated in this manual.
CAUTION
Pump not designed,
tested or certified
to be powered
by compressed
natural gas.
Powering the pump with natural gas will
void the warranty.
WARNING
Before maintenance
or repair, shut off the
com-pressed 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.
WARNING
In the event of
diaphragm rupture,
pumped material may
enter the air end of
the pump, and be
discharged into the atmosphere. The air
exhaust must be piped to an appropriate
area for safe disposition.
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.
eh2-sh2dl4sm-rev0614 Model EH2-M & SH2-M Page 1
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.
DIAPHRAGM SERVICING/FILLING DRIVER FLUID
Motive power is delivered to the single diaphragm of the pump through a
uid cell located between the diaphragm and the drive piston. During preventative
maintenance servicing (where the diaphragm has not ruptured, and the uid cell is still
lled), the uid should be drained from the chamber by removing the pipe plug, in the
lower most portion of inner chamber, item 54.
To ll the uid cell, the piston(s) must be on full discharge stroke. To do this and hold
during ll procedure, remove item 46, (tting) from the cylinder cap (item 15) and insert
air pressure. This need not be more than 10 PSI. This will move the piston(s) and hold
them in the discharge position. Remove the pipe plug at the top of the uid chamber,
and ll the chamber with ethylene glycol (anti-freeze). The chamber will take 3000 ml
(101.5 uid ounces) of uid. If the diaphragm is Teon, use 2800 ml (95 uid ounces).
Tilt the pump to evacuate air pockets from the uid chamber. A box wrench can be
used to ex the diaphragm and purge air from the uid chamber. Fill the chamber to
the top of the ll hole, and re-insert the pipe plug, using thread compound.
If the glycol cell uid is not compatible with the pumped product or would form a
potentially dangerous mixture if the diaphragm ruptured, consult the factory before
choosing an alternative uid.
CYLINDER PISTON SERVICING
The driver uid must be drained (see above) to service the cylinder piston. The
piston seals are different on the air side versus the driver uid side. Typically, the
uid side will require replacement before the air side. Remove the nuts and washers that secure the air side piston cap and inner uid chamber to the intermediate
bracket. The cylinders may now be removed. Inspect the cylinder wall carefully.
Scratches can cause driver uid to leak to the air side of the pump, which can nd
its way to the exhaust mufer. Scratches on the air cylinder will cause too much
air to leak when on pressure stroke. The locknuts holding the cylinder to the rod
can now be removed. Carefully inspect the piston for scratches, burrs and wear,
especially if the piston seals are worn.
The piston seals can now be inspected or replaced. AIR SIDE–The air side piston
has a T-Seal. If the seal is worn showing at areas or gouges, it will require replacement. Remove seal and back-up (spacer). Remove wear rings and carefully inspect
for wear. During reassembly make sure the ends of the back up spacer and wear ring
end are not across from each other. WET SIDE–The wet side piston has a yellow PSP
seal. Inspect for at spots and gouges. Behind the seal is an energizer ring that helps
to load the seal against the cylinder wall. (The energizer ring is included with the new
seal.) The wear rings are the same as on the air side. Again, make sure the ends are
not across from each other.
Reassembly of both pistons is the opposite of removal. Make sure the side of the
locknut with the seal is next to the piston. The groove in the piston or o-ring (item
35), must be toward the pump center (o-ring seals next to the rod). Apply a heavy oil to
the piston seals when sliding on the cylinder. The piston/nut should be torqued at 500
in./lbs. (56.49 Newton meters). The studs that secure the cylinders to the intermediate
should be torqued at 250 in./lbs. (28.24 Newton meters). IMPORTANT NOTE: Reas-
sembly of the wet side piston/seal assembly differs from the air side in that it must be
carefully pressed into the cylinder. An arbor press is commonly used for this purpose.
WARNING
Do not smoke near
the pump or use
the pump near an
open flame. Fire or
explosion could result.
WARNING
This pump must not
be used for fluid
transfer into aircraft.
WARNING
This pump is
pressurized internally
with air pressure
during operation.
Always make certain
that all bolting is in good condition and
that all of the correct bolting is reinstalled
during assembly.
WARNING
When used for toxic or
aggressive uids, the
pump should always
be ushed clean prior
to disassembly.
WARNING
Before doing any
main-tenance 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 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 all times in the vicinity of the pump.
Failure to follow these recommendations
may result in serious injury or death.
WARNING
Airborne particles and
loud noise hazards.
Wear ear and eye
protection.
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 lubricatrion of the compressed
kg
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
Pump complies with EN809
Pumping Directive, Directive
2006/42/EC Machinery, according to
Annex VIII.
Model EH2-M & SH2-M Page 2 eh2-sh2dl4sm-rev0614
WARNING
Use safe practices
when lifting
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 com-
pressed 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 (available from Warren Rupp) 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.
Main Air Valve
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 pres-
sure 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 arbor 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.
PILOT VALVE ACTUATOR SERVICING
The bushings for the pilot valve actuators are threaded into the intermediate bracket from the outside. The plunger may be removed for inspection or
replacement from the inside by removing the air distribution valve body and the pilot valve
body from the pump. The plungers should be visible as you look into the intermediate
from the top. Depending on their position, you may nd it necessary to use a ne piece
of wire to pull them out.
Under rare circumstances, it may become necessary to replace the o-ring seal. The
bushing can be pushed through the inner chamber by removing the outer chamber the
assembly to reach the bushing.
eh2-sh2dl4sm-rev0614 Model EH2-M & SH2-M Page 3
TROUBLE SHOOTING
1. Pump will not cycle
A. Check to make sure the unit has enough pressure to operate and that the air
inlet valve is open.
B. Check the discharge line to insure that the discharge line is neither closed nor
blocked.
C. If the spool in the air distribution valve is not shifting check the main spool. It
must slide freely.
D. Excessive air leakage in the pump can prevent cycling. Air leakage from the
exhaust port indicates leakage in the air distribution valve. See further service instruc-
tions.
E. Blockage in the liquid chamber can impede movement of diaphragm.
2. Pump cycles but will not pump
A. Suction side of pump pulling in air. Check the suction line for air leaks and be
sure that the end of the suction line is submerged. Check ange bolting. Check valve
anges and manifolds to chamber ange joints.
B. Make certain the suction line or strainer is not plugged. Restriction at the suc-
tion is indicated by a high vacuum reading when a vacuum gauge is installed in the
suction line.
C. Check valves may not be seating properly. To check, remove the suction line and
cover the suction port with your hand. If the unit does not pull a good suction (vacuum),
the check valves should be inspected for proper seating.
D. Static suction life may be too high. Priming can be improved by elevating the
suction and discharge lines higher than the check valves and pouring liquid into the
unit through the suction inlet. When priming at high suction lifts or with long suction
lines operate the pump at maximum cycle rate.
3. Low performance
A. Capacity is reduced as the discharge pressure increases. Performance
capability varies with available inlet supply. Check air pressure at the pump inlet when
the pump is operating to make certain that adequate air supply is maintained.
B. Check vacuum at the pump suction. Capacity is reduced as vacuum increases. Reduced ow rate due to starved suction will be evident when cycle rate can
be varied without change in capacity. This condition will be more prevalent when
pumping viscous liquids. When pumping thick, heavy material the suction line must
be kept as large in diameter and as short as possible, to keep suction loss minimal.
C. Low flow rate and slow cycling rate indicate restricted flow through the
discharge line. Low ow rate and fast cycling rate indicate restriction in the suction line
or air leakage into suction.
For more information, refer to the Warren Rupp Troubleshooting Guide.
WARRANTY: This unit is guaranteed for a period of ve years against defective
material and workmanship.
For high pressure pumps used in conjunction with another diaphragm pump in “skid
mount” system: The EH2-M will not prime against the head created by the ll pump.
Run both simultaneously at start-up.
RECOMMENDED WARREN RUPP® ACCESSORIES
TO MAXIMIZE PUMP PERFORMANCE:
• Tranquilizer® Surge Suppressor. For nearly pulse-free ow.
• Warren Rupp Air Dryer. For clean, dry compressed air.
• Warren Rupp 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.
Model EH2-M & SH2-M Page 4 eh2-sh2dl4sm-rev0614
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