SANDPIPER MP05D - Manual (Page 16)

Models MP05D, MP08D, MP12D and MP14D Design Level 1 Page 4 520-168 thru 171-000 3/03
DANGER
Before doing any maintenance 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.
CAUTION
In the event of diaphragm rupture,
pumped material may enter the air end
of the pump, and be discharged into the
atmosphere. If pumping a product which
is hazardous or toxic, the air exhaust
must be piped to an appropriate area for
safe disposition.
IMPORTANT
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.
CAUTION
Before maintenance or repair, shut off
the compressed 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. When used for toxic or
aggressive fluids, the pump should
always be flushed clean prior to
disassembly.
FILLING PROCEDURE
Insert safety clip (p/n 210-008-330) on one side of the main air valve body before
applying air pressure. Cycle the pump at 5 to 10 psi. As you face the pump, the side
with the pin should be the first driver fluid reservoir to be filled. The driver diaphragm
will be on a suction stroke. Pour the correct amount of liquid into the reservoir. Fill
volume amounts differ for each model, and are listed below. The fluid level will not
come completely to the top. Loosely install the pipe plug, with pipe dope, Teflon tape
or o-ring (depending on pump model) placed on threads. Release all air pressure to
the pump and remove the safety clip. The diaphragm will relax and will come to
center. Watch the loose pipe plug closely as air escapes and the driver fluid level
rises. Insert the safety clip on the opposite side and add a small amount of air
pressure. When you see liquid weeping out between the loose pipe plug and fill hole,
tighten the pipe plug. Repeat the procedure for the unfilled chamber.
If you have a problem getting the driver fluid to come to the top, a blunt instrument
can be inserted into the chamber port of the pump and pressure can manually be
applied to the pumping diaphragm to cause the liquid to come to the top. DO THIS
CAREFULLY. A needle valve for precision stroking control is recommended at the
air inlet for this procedure. Please be aware that air left in the chambers will result in
faulty operation of the pump and will cause premature pumping diaphragm failure.
MP05D Volume for Teflon overlay =540 ML/18.26 fl. oz.
Volume for non-overlay
=600 ML/20.29 fl. oz.
Use Teflon tape on pipe plugs. Tilt pump to bring tee on sight tube assembly to highest
point when displacing air from containment chambers.
MP08D Volume for non-overlay =2640 ML/89.27 fl. oz.
Use Teflon tape on pipe plugs. Tilt pump to bring tee on sight tube assembly to highest
point when displacing air from containment chambers.
MP14D Volume for non-overlay =5340 ML/180.59 fl. oz.
Tilt pump to bring tee on sight tube assembly to highest point when displacing air from
containment chambers.
MP12D Volume for non-overlay =2640 ML/89.27 fl. oz.
Tilt pump to bring tee on sight tube assembly to highest point when displacing air from
containment chambers.
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 flush the pump as required to prevent damage.
In freezing temperatures the pump must be completely drained when idle. Tilting
the pump will allow the liquid from the chambers to run out of the discharge port.
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. This condition will be
evident. Air leakage into the discharge line indicates a ruptured diaphragm. Air leak-
age from the exhaust port indicates leakage in the air distribution valve. See further
service instructions.
E. Blockage in the liquid chamber can impede movement of diaphragm.
F. Plugged or dirty exhaust muffler.
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 flange bolting. Check
valve flanges and manifold to chamber flange Joints.
B. Make certain the suction line or strainer is not plugged. Restriction at the