SANDPIPER EB1 1/2-SM - Manual (Page 2)

Model EB1½-SM Type 1 Page 2 520-096-000 8/00
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. Check
exhaust muffler regularly for build-up of ice or contaminants.
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 bolts securing the manifold(s). Inspect the surfaces of both
check valves 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. 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 350 in./lbs. (40.67 Newton Meters), 450 in./lbs. for
TGN-SS. Torque while allowing diaphragm to turn freely with plates. Except for
EPDM rubber, use a lightweight oil between plates and diaphragm when doing this
procedure. Use a wrench on the capscrew of the opposite side to keep the rod from
rotating. If the opposite chamber is assembled, the rod need not be held.
When reassembling the outer chambers and the manifold, the bolts securing the
manifold flange to the chamber should be snugged prior to tightening the chamber
bolts, to insure that the chamber port flange is square with the manifold flange.
Finish tightening the manifold flange bolts after chamber bolting is secured.
A NOTE ABOUT AIR VALVE LUBRICATION
The SandPiper pump’s pilot 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 would entail the use of an air line lubricator (available from Warren Rupp)
set to deliver one drop of 10 wt., non-detergent oil for every 20 SCFM of air the
pump consumed at its point of operation. Consult the pump’s published Performance
Curve to determine this.
CAUTION
If a diaphragm fails the pumped product
or fumes can enter the air side of the
pump. This side is exhausted through
the exhaust port (muffler).
When the product is a hazardous or
toxic material, the exhaust should be
piped to an appropriate area for safe
disposition.
When the product source is at a higher
level than the pump (flooded suction),
the exhaust should be piped to a higher
level than the product to prevent spills
caused by siphoning.
Diaphragm installation.
Ball check valve.
Exhaust muffler.