SANDPIPER MP05D - Manual (Page 13)

520-168 thru 171-000 3/03 Models MP05D, MP08D, MP12D and MP14D Design Level 1 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 • www.warrenrupp.com
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.
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.
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.
PRINCIPLE OF OPERATION
All SandPlPER pumps, including these spill containment models, 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 simulta-
neously 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.
The spill containment pumps differ from standard models in that they utilize 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, Teflon or elastomeric, are separated by a spill containment chamber
filled with liquid (typically ethylene glycol, green in color),which transmits the recipro-
cating motion of the driver diaphragm to the pumping diaphragm. The pumping
diaphragms, in turn, create the alternating suction and discharge action to each outer
diaphragm chamber. In normal operation the pumping 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.
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.
AIR VALVE LUBRICATION
The 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 MARATHON) set to deliver one drop of 10 weight, 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.
CAUTION
The spill containment models 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 pumping diaphragm
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.
SERVICE AND OPERATING MANUAL
Design Level 1
MP05D • MP08D • MP12D • MP14D
A WARREN RUPP PUMP BRAND