SANDPIPER EB3-SM - Manual (Page 2)

Model EB3-SM Page 2 520-057-000 8/00
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 of the check valves 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 twelve bolts (six each side) securing the manifold assemblies to the
outer chambers. Remove the eight bolts 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 vice and turn the outer plate counterclockwise using
the
15 /
16
" wrench. The interior components consisting of shaft seals, sleeve bearings
and bearing retainers are now accessible for service.
REASSEMBLY
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 35 ft. lbs. (47.45 Newton meters) torque. After both diaphragm
assemblies have been assembled, thread one assembly into the shaft (hold the shaft
near the middle in a vice with soft jaws, to protect the finish). Install this sub assembly
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 to 25 ft. lbs. (33.90 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,
torque the eight capscrews to 200 in./lbs. (22.60 Newton meters).
A Note about Air Valve Lubrication
The SandPiper pump’s pilot valve and main air valve assemblies are designed to
operate WITHOUT lubrication. This is the preferred mode of operation. There may be
instances of personal preference, or poor quality air supplies when lubrication of the
compressed air supply is required. The pump air system will operate with properly
lubricated compressed air supplies. Proper lubrication of the compressed air supply
DANGER
Before doing any maintenance on the
pump, be certain all pressure is com-
pletely vented from the pump, suction,
discharge, piping, and all other open-
ings and connections. Be certain the air
supply is locked out or made non-
operational, so that it cannot be started
while work is being done on the pump.
Be certain that approved eye protection
and protective clothing are worn at all
times in the vicinity of the pump. Failure
to follow these recommendations may
result in serious injury or death.