SANDPIPER MP07D - Manual (Page 5)

520-134-000 3/03 Model MP07D Design Level 3 Page 5
B. Make certain the suction line or strainer is not plugged. Restriction at the suction
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 lift 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.
E. Check driver fluid level.
3. Low performance
A. Capacity is reduced as the discharge pressure increases, as indicated on the
performance curve. Performance capability varies with available inlet air supply.
Check air pressure at the pump inlet when the pump is operating to make certain
that adequate air supply is maintained. Low flow rate as discharge pressure
increases can also be a sign of too little or no driver liquid in the driver chamber.
B. Check the vacuum at the pump suction. Capacity is reduced as vacuum
increases. Reduced flow rate due to starved suction will be evident when the cycle
rate can be varied without change in capacity. This condition will be more prevalent
when pumping viscous liquids. When pumping thick, heavy materials 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 flow rate and fast cycling rate indicate restriction in the suction line or air
leakage into suction.
D. Unstable cycling indicates improper check valve seating on one chamber. This
condition is confirmed when unstable cycling repeats consistently on alternate
exhausts. Cycling that is not consistently unstable may indicate partial exhaust
restriction due to freezing and thawing of exhaust air. Using the Warren Rupp
extractor/ dryer should solve this problem.
E. Check driver fluid level.
WARRANTY
This unit is guaranteed for a period of five years against defective material and
workmanship.
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 the pump is
used for toxic or aggressive fluids, it
should be flushed clean prior to
disassembly.
CAUTION
Do not use a wrench on the
diaphragm rod. Flaws on the surface
may damage bearings and seals.
NOTE
See ‘‘Filling of Driver Chamber with
Liquid’’ for the correct procedure to
recharge the pump for operation.
NOTE
When electronic leak detector is used
with this model pump, the probes
must be fitted into special boss plugs,
to replace item 56, bottom. Order one
kit 475-098-000 for each pump.