SANDPIPER M20 Non-Metallic - Manual (Page 17)

m20nmdl3sm-rev0713 Model M20 Non-Metallic Page 15
SPILL CONTAINMENT CONCEPT
The spill containment option
prevents the air end components from
being contaminated or damaged when
a pumping diaphragm ruptures while
pumping caustic or toxic materials. It
also helps to protect the environment.
With the installation of optional leak
detectors (either mechanical or
electronic) the diaphragm rupture can
be detected. The pump can then be
shut down and repaired before any
caustic or toxic materials can enter
the air end and be exhausted into the
surrounding environment.
OPTION DIAPHRAGM SERVICING
To service the diaphragms first
shut off the suction, then shut off the
discharge lines to the pump. Next shut
off the compressed air supply, bleed
the pressure from the pump, and
disconnect the air supply line from the
pump. Drain any remaining pumped
liquid from the pump. Remove the pump
before servicing.
Next, drain the fluid from the spill
containment chambers. This can be
done by removing the bottom plug
(item 51) from each spill containment
chamber.
After the fluid from the spill
containment chambers has been
drained, the wet end components
can now be removed. See diaphragm
servicing section for detailed
instructions. The spill containment
option has two additional virgin PTFE
pumping diaphragms (item 46). These
diaphragms are installed with the
natural concave curve toward the
outer chamber (items 16 from the pump
assembly drawing).
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.
Follow the steps listed here to
replace the liquid in the pump after
disassembly or liquid loss:
1. Drain the fluid in the spill
containment chambers by removing
the bottom two boss plugs (items 51).
Replace the bottom two boss plugs after
the fluid is drained.
2. Remove the eight capscrews (item
8) fastening the discharge manifold and
elbows to the outer chambers (items
16). The discharge manifolds and
elbows can now be removed.
3. Remove the top two boss plugs
(items 51). The spill containment
chambers are filled through the exposed
ports.
4. Install safety clip (item 1-N) into
the smaller unthreaded hole in one end
cap (item 1-D). This locks the valve
spool to one side, keeping the pump
from shifting. Apply air pressure to the
air distribution valve.
5. 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.
6. Loosely reinstall one boss plug
(item 51) to the filled spill containment
chamber.
7. Shut off air supply. Remove safety
clip. Adjust the air line regulator so that
air pressure slowly fills the pump. The
diaphragm expands, forcing the fluid
in the chamber to be slowly displaced.
When the pump shifts to the opposite
side, quickly install the safety clip.
8. Loosen the top boss plug 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.
9. 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 (item 16). 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.
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.
IMPORTANT
10. Repeat steps 5 through 9 to fill
opposite spill containment chamber.
11. Reinstall the check valve
components, discharge manifold
and elbows to the pump. The
pump is now ready for operation.