SANDPIPER MP07D - Manual

WARREN RUPP, INC. A Unit of IDEX Corporation • P.O. Box 1568 • Mansfield, Ohio 44901-1568 USA • (419) 524-8388 Fax (419) 522-7867
Model MP07D Design Level 3 Page 1 520-134-000 3/03
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
All Marathon pumps, including this Spill Containment model, operate on the
same basic principle. They are powered by compressed air which alternately
pressurizes the inner sides of the two diaphragm chambers while simultaneously
exhausting the opposite inner chambers causing the diaphragms, which are
connected by a shaft, to move endwise. Since air pressure is applied over the entire
surface of the diaphragm which is forcing liquid to be discharged by its other side,
the diaphragm is operating under a balanced condition during the discharge stroke.
This allows the unit to be operated at discharge heads over 200 feet (61 meters) of
water head.
Alternate pressurizing and exhausting of the diaphragm chamber is performed
by an externally mounted, pilot-operated, four way, spool type air distribution valve.
When the spool is at one end of the valve body, inlet air pressure is connected to one
diaphragm chamber and the other diaphragm chamber is connected to the exhaust.
When the spool is removed to the opposite end of the valve body, the porting of
chambers is reversed. The air distribution valve spool is moved from one end position
to the other in the valve body by means of an internal pilot valve which alternately
pressurizes the ends of the air distribution valve spool while simultaneously
exhausting the other ends. The pilot valve is positively shifted at each end of the
diaphragm stroke by the diaphragm plate’s coming in contact with the end of the pilot
valve spool and pushing 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 to maintain flow in one direction through the pump.
This Marathon pump differs from other Marathons only 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 Teflon), are separated by a chamber filled with liquid which
transmits the reciprocating motion of the driver diaphragm to the pumping diaphragm.
The Teflon pumping diaphragms, in turn, create the alternating suction and discharge
action to each outer diaphragm chamber. The outer diaphragms are the only ones in
contact with the liquid being pumped.
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 fittings. High
vacuums reduce flow rate capability and shorten driver diaphragm service life.
Suction head is not recommended except where NPSH might so dictate.
For permanent installations involving rigid piping, install short flexible sections
of hose between the pump and piping. This reduces strains and permits easier
removal of the pump for service when required. At time of installation, inspect all
external gasketed fasteners for looseness caused by gasket creep. Tighten
loose fittings securely to prevent leakage.
FILLING OF DRIVER CHAMBERS WITH LIQUID
THE DRIVER CHAMBERS WILL BE FILLED WITH WATER AT THE FACTORY.
If you prefer to substitute another liquid, to prevent system contamination consult
the factory first to determine compatibility of the substitute with pump construction.
Follow the steps listed below to replace the liquid in the pump after disassembly
or liquid loss:
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, all external
gasketed fasteners must be inspected
for looseness caused by gasket creep
after leaving the factory. Retorque
loose fasteners to insure against
leakage. Follow recommended
torques where called out. (A card is
attached to each new pump stating
this fact.)
CAUTION
This pump should not be applied in
pumping applications where the
driver liquid coming in contact with
the pumped liquid would create a
hazardous condition. This could
happen in case of a Teflon pumping
diaghragm failure since this
diaphragm normally separates the two
liquids. Also note that care must be
taken to guard against the operation
of this unit if it has been subjected to
freezing temperatures. Because of the
driver liquid used, possible
diaphragm failure may result.
A WARREN RUPP PUMP BRAND
SERVICE AND OPERATING MANUAL
Design Level 3
Model MP07D