SANDPIPER S20 Non-Metallic - Manual (Page 14)

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11
• Model S20 Non-Metallic
Read these instructions completely, before
installation and start-up. It is the responsibility of
the purchaser to retain this manual for reference.
Failure to comply with the recommendations
stated in this manual will damage the pump, and
void factory warranty.
Step 1: With the unit removed from service. Remove
each bottom boss plug (item 52). Drain the fluid from
spill containment chambers. With manifolds and outer
chambers removed, remove diaphragm assemblies
from diaphragm rod.
DO NOT use a pipe wrench or similar tool to remove
assembly from rod. Flaws in the rod surface may
damage bearings and seal. Soft jaws in a vise are
recommended to prevent diaphragm rod damage.
Step 1.A: NOTE: Not all inner diaphragm plates
are threaded. Some models utilize a through hole
in the inner diaphragm plate. If required to separate
diaphragm assembly, place assembly in a vise,
gripping on the exterior cast diameter of the inner
plate. Turn the outer plate clockwise to separate the
assembly.
Always inspect diaphragms for wear cracks or
chemical attack. Inspect inner and outer plates for
deformities, rust scale and wear. Inspect intermediate
bearings for elongation and wear. Inspect diaphragm
rod for wear or marks. Clean or repair if appropriate.
Replace as required.
Step 2: Reassembly: There are two different types of
diaphragm plate assemblies utilized throughout the
Sandpiper product line: Outer plate with a threaded
stud, diaphragm, and a threaded inner plate. Outer
plate with a threaded stud, diaphragm, and an inner
plate with through hole. Secure threaded inner plate
in a vise. Ensure that the plates are being installed
with the outer radius against the diaphragm.
Step 3: Lightly lubricate, with a compatible material,
the inner faces of both outer and inner diaphragm
plates when using on non-Overlay diaphragms (For
EPDM water is recommended). No lubrication is
required.
Step 4: Push the threaded outer diaphragm plate
through the center hole of the diaphragm.
Note: Most diaphragms are installed with the natural
bulge out towards the fluid side.
Step 5: Thread or place, outer plate stud into the inner
plate. For threaded inner plates, use a torque wrench
to tighten the assembly together. Torque values are
called out on the exploded view. Repeat procedure
for second side assembly. Allow a minimum of 15
minutes to elapse after torqueing, and then re-torque
the assembly to compensate for stress relaxation in
the clamped assembly.
Step 6: Thread one assembly onto the diaphragm
rod with sealing washer (when used) and bumper.
Step 7: Install diaphragm rod assembly into pump and
reassemble containment chamber then the pumping
diaphragms (item 46) secure by installing the outer
chamber in place and tightening the capscrews.
Replace bottom boss plug (item 52) and new O-Ring
(item 49) NOTE: The spill containment option has
two additional pumping diaphragms (item 41). These
diaphragms are installed with the natural concave
curve toward the outer chamber.
Step 8: On opposite side of pump, thread the
remaining assembly onto the diaphragm rod. Using a
torque wrench, tighten the assembly to the diaphragm
rod. Align diaphragm through bolt holes, always going
forward past the recommended torque. Torque values
are called out on the exploded view. NEVER reverse
to align holes, if alignment cannot be achieved
without damage to diaphragm, loosen complete
assemblies, rotate diaphragm and reassemble as
described above.
Step 9: Reassemble containment chamber then the
pumping diaphragms (item 46) secure by installing the
outer chamber in place and tightening the capscrews.
Replace bottom boss plug (item 52) and new O-Ring
(item 49).
NOTE: The spill containment option has two additional
pumping diaphragms (item 46). PTFE diaphragms
are installed with the natural concave curve toward
the outer chamber.
NOTE: One Piece Diaphragm Servicing (Bonded
PTFE with integral plate) The One Piece diaphragm
has a threaded stud installed in the integral plate at
the factory. The inner diaphragm plate has a through
hole instead of a threaded hole. Place the inner
plate over the diaphragm stud and thread the first
diaphragm / inner plate onto the diaphragm rod only
until the inner plate contacts the rod. Do not tighten. A
small amount of grease may be applied between the
inner plate and the diaphragm to facilitate assembly.
Insert the diaphragm / rod assembly into the pump
and install the outer chamber. Turn the pump over
and thread the second diaphragm / inner plate onto
the diaphragm rod. Turn the diaphragm until the
inner plate contacts the rod and hand tighten the
assembly. Continue tightening until the bolt holes
align with the inner chamber holes. DO NOT LEAVE
THE ASSEMBLY LOOSE.
FILLING CHAMBERS WITH LIQUID
THE CHAMBERS ARE FILLED WITH WATER AT
THE FACTORY.
If you prefer to substitute another liquid, to prevent
system contamination consult the factory first to
determine compatibility of the substitute with pump
construction.
Spill Containment Servicing
Follow the steps listed here to replace the liquid in the
pump after disassembly or liquid loss:
10. With the top two boss plugs (items 51) removed.
The spill containment chambers are filled through the
exposed ports.
11. Install safety clip (item 1-K) into the smaller
unthreaded hole in one end cap (item 1-E). This locks
the valve spool to one side, keeping the pump from
shifting. Apply air pressure to the air distribution valve.
12 Face the side of the pump with the installed safety
clip. If the safety clip is installed in the top end cap, fill
the left spill containment chamber. If the safety clip
is installed on the bottom end cap, fill the right spill
containment chamber. The volume of fluid is 1950 ml
(65.9 fl. oz.). It is important that the exact amount of fluid
is used. Too little or too much fluid causes premature
diaphragm failure and erratic pumping.
13. Loosely reinstall one boss plug (item 51) to the
filled spill containment chamber.
14. Shut off air supply. Remove safety clip. Manually
shift air valve by pushing stroke indicator pin in the
opposite direction of current position. Install safety
clip (item 1-K) into the smaller unthreaded hole in the
opposite end cap (item 1-E). This locks the valve spool
to one side, keeping the pump from shifting. Adjust
the airline regulator so that air pressure slowly fills the
pump. The diaphragm expands, forcing the fluid in the
chamber to be slowly displaced.
15. Loosen the top boss plug (item 51) on the filled
chambers. This allows fluid in the chamber to purge
trapped air from the chamber. This can be seen by
watching the column of fluid in the sight tube. When
fluid appears at the top of the port, quickly tighten the
boss plug. Fluid loss of 1 to 2ml is acceptable.
16. Tilt the pump so the uppermost pipe tee (item 53) is
in the vertical position. Loosen the pipe plug (item 50).
This will allow trapped air to purge through the pipe tee.
When fluid appears at the tee opening, reinstall the pipe
plug. NOTE: If all air is not purged using this procedure,
remove the check valve components from the top
port of the outer chamber (item16). Apply manual
pressure to the pumping diaphragm by inserting a blunt
instrument into the top port of the outer chamber and
applying pressure to the diaphragm. Loosen the pipe
plug (item 50) allowing the fluid to purge any remaining
trapped air. Reinstall the plug.
17. Repeat steps 12 through 16 to fill opposite spill
containment chamber.
18. Reinstall the check valve components, discharge
manifold and elbows to the pump. The pump is now
ready for operation.
4: AIR
END