SANDPIPER SSB2-A - Manual (Page 4)

Model SSB2-A Type 3 Page 2 ssb2dl3sm-REV0614
For start-up, open an air valve approximately 1/2 to 3/4 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 humid-
ity conditions. Use of a Warren Rupp 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.
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.
DIAPHRAGM SERVICING
Remove the stud nuts (six each side) securing the elbows to the outer
chambers. Remove the eight knobs securing the outer chamber to the inner chamber.
Remove the diaphragm assembly (outer plate, diaphragm, inner plate) by turning the
assembly counterclockwise using a 15/16 (2.38 cm) wrench on the outer plate lugs. To
disassemble the diaphragm assemblies, screw into the inner plates two threaded pins,
place the pins in a vise and turn the outer plate counterclockwise using the 15/16
wrench. The interior components consisting of U-cup seals and sleeve bearings are now
accessible for service.
Procedures for reassembling the diaphragms are the reverse of the above. The
diaphragms must be installed with their natural bulge to the outside, toward the outer
diaphragm plate. Install the inner plate with the flat face against the diaphragm.
After all components are in position in a vise and hand tight, tighten with a wrench
to approximately 40 ft. Ibs. (54.23 Newton meters) torque. After both diaphragm
assemblies have been assembled, thread one assembly into the shaft (hold the shaft
near the middle in a vise with soft jaws, to protect the finish). Install this subassembly
into the pump and secure by placing the outer chamber on the end with the diaphragm.
This holds the assembly in place while the opposite side is installed. Torque the last
diaphragm assembly to 30 ft. Ibs. (40.67 Newton meters). This final torquing will lock the
diaphragm assemblies together. Place the remaining outer chamber on the open end
and loosely tighten the bolts. Replace the manifold assemblies to square the flanges
before final tightening of the remaining bolts. Alternating for progressive tightening, the
eight knobs that secure outer chamber to inner chamber.
A NOTE ABOUT AIR VALVE LUBRICATION
The SANDPIPER pump’s pilot valve and main air valve assemblies are designed to