SANDPIPER SET2-A - Manual (Page 5)

520-117-000 5/99 Model SET2-A Type 3 Page 5
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.