SANDPIPER MSA25 - Manual (Page 9)

Model MSA1, MSA25 Type 4 Page 8 msa1dl4sm-rev0711
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.
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.
B. Check vacuum at the pump suction. Capacity is reduced as vacuum increases.
Reduced flow rate due to starved suction will be evident when cycle rate can be varied
without change in capacity. This condition will be more prevalent when pumping viscous
liquids. When pumping thick, heavy materials (10,000 SSU limit), 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.
NOTE: Bottom chamber porting on the MSA1 pump for thick liquids may create an
air trap in the outer liquid chamber, causing reduced displacement and low capacity
performance. Use of air vent lines from the top of the chamber back to the liquid source
will correct this. Converting to top chamber porting will eliminate any possibility of an
air trap in the liquid chambers.
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. Use of an air dryer should solve
this problem.
WARRANTY
This pump is warranted for a period of five years against defective material and
workmanship. Failure to comply with the recommendations stated in this manual voids
all factory warranty.
RECOMMENDED WARREN RUPP ACCESSORIES TO MAXIMIZE PUMP PERFORMANCE:
• Tranquilizer ® Surge Suppressor. For nearly pulse-free flow.
• Warren Rupp Filter/Regulator. For modular installation and service convenience.
• Warren Rupp Speed Control. For manual or programmable process control. Manual
adjustment or 4-20mA reception.
For more detailed information on these accessories, contact your local Warren Rupp Factory-Authorized
Distributor, or Warren Rupp corporate headquarters.