SANDPIPER ST25A - Manual

520-005-000 1/04 Models ST1-A, ST25A Type 4 Page 1
WARREN RUPP, INC. A Unit of IDEX Corporation • P.O. Box 1568 • Mansfield, Ohio 44901-1568 USA • (419) 524-8388 Fax (419) 522-7867
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.
This specially-fitted SandPIPER pump differs from standard units in that it utilizes
four diaphragms instead of two. The two rod-connected diaphragms being the driver
diaphragms, and the other two (outermost) diaphragms being the actual
pumping diaphragms. Each driver diaphragm (of Neoprene or other elastomer), and the
pumping diaphragm (of TFE), are separated by a chamber filled with liquid. This
transmits the reciprocating motion of the driver diaphragm to the pumping diaphragm.
The TFE pumping diaphragms create alternating suction and discharge action to each
outer diaphragm chamber. The pumping diaphragms are the only ones in contact with
the liquid being pumped.
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
® surge suppressor is recommended to further reduce
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 10-15 feet (35 meters) or
less. For suction lifts exceeding 15 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 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.
Type 4
Model ST1-A
Model ST25A
II 2GD T5
CE
I n t h e e v e n t o f
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
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
B e f o r e p u m p
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
Read these safety
w a r n i n g s a n d
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.
Take action to prevent
static sparking. Fire
or explosion can
result, especially
w h e n h a n d l i n g
flammable liquids.
T h e p u m p , p i p i n g , v a l v e s ,
containers or other miscellaneous
e q u i p m e n t m u s t b e g r o u n d e d .
WArninG
iMPorTAnT
SERVICE AND OPERATING MANUAL