SANDPIPER MSA25 - Manual (Page 6)

msa1dl4sm-rev0711 Model MSA1, MSA25 Type 4 Page 5
AIR SUPPLY
Air supply pressures cannot exceed 125 psi (8.61 bar). Connect the pump air inlet
to an air supply of sufficient capacity and pressure required for desired performance.
When the air line is solid piping, use a short length of flexible hose (not less than
3/4" (19mm) in diameter) between pump and piping to eliminate strain to pipes. Use of a
Warren Rupp Filter/Regulator is the air line is recommended.
AIR INLET & PRIMING
For start-up, open an air valve approximately 1/4" to 1/2" turn. After the unit primes,
an air valve can be opened to increase flow as desired. If opening the valve increases
cycling rate, but does not increase flow rate, cavitation has occurred, and the valve should
be closed slightly.
For the most efficient use of compressed air and the longest diaphragm life, throttle
the air inlet to the lowest cycling rate that does not reduce flow.
AIR EXHAUST
If a diaphragm fails, the pumped liquid or fumes can enter the air end of the pump, and
be exhausted into the atmosphere. When pumping hazardous or toxic materials, pipe the
exhaust to an appropriate area for safe disposition.
This pump can be submerged if materials of construction are compatible with the liquid.
The air exhaust must be piped above the liquid level. Piping used for the air exhaust must
not be smaller than 1" (2.54 cm). Reducing the pipe size will restrict air flow and reduce
pump performance. When the product source is at a higher level than the pump (flooded
suction), pipe the exhaust higher than the product source to prevent siphoning spills.
Freezing or icing of the air exhaust can occur under certain temperature and humidity
conditions. Use of an air dryer should eliminate most icing problems.
BETWEEN USES
When used for materials that tend to settle out or transform to solid form, the pump
should be completely flushed after each use, to prevent damage. Product remaining in
the pump between uses could dry out or settle out. This could cause problems with valves
and diaphragms at re-start. In freezing temperatures, the pump must be drained between
uses in all cases.
CHECK VALVE SERVICING
Need for inspection or service is usually indicated by poor priming, unstable
cycling, reduced performance or the pump’s cycling but not pumping.
Remove the six flange bolts securing the inlet and outlet flanges to the manifold. Inspect
the surfaces of both check valve and seat for wear or damage that could prevent proper
sealing. If pump is to prime properly, valves must seat air tight.
Flap type models can be assembled with the manifold positioned under the
diaphragm chamber (bottom porting) or above (top porting). Inlet and outlet
flange pipe threads run horizontal in either case. Flap valves and seats must be reas-
sembled to unit to conform to the “IN” and “OUT” markings on the base plate. Install the
valve seat and flap valve on the side of the unit marked “OUT” with the flap valve hanging
down and swinging away from the manifold into the flange. Install the flap valve and seat
on the other side of the unit marked “IN” with the flap valve hanging down and swinging
into the manifold, away from the flange. Inlet and outlet direction is determined by how
the check valves are installed.
DIAPHRAGM SERVICING
Remove the four bolts securing the manifold flange to the chamber. Remove the eight
nuts securing the outer diaphragm chamber flange and remove the chamber. Loosen the
capscrew securing the diaphragm and plate to the rod by leaving the diaphragm engaged
with the capscrews around the outer flange, preventing rotation of the rod. DO NOT USE
A WRENCH ON THE DIAPHRAGM ROD. FLAWS ON THE SURFACE MAY DAMAGE
BEARINGS AND SEAL.
During reassembly make certain that the rubber bumper is on the rod on each
side. Install the diaphragm with the natural bulge outward as indicated on the
diaphragm. Install the heavier plate on the outside of the diaphragm and make
certain that the large radius side of both plates are toward the diaphragm. Place the
sealing washer between the inner diaphragm plate and the end of the rod. Tighten
the capscrew to approximately 25 ft. Ibs. (33.9 Newton meters). Torque while
allowing diaphragm to turn freely with plates, except for EPDM rubber, use a light weight
oil between the plates and diaphragm when doing this procedure. Use a wrench on the