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Section 3
System Installation
NOTE: Dry nitrogen is used for pressurizing the Refill System and is
not supplied . It may be obtained for a nominal rental charge from
any local welding supplier . Order standard size (industrial grade)
cylinder with CGA 580 nitrogen fitting . Refer to Froth-Pak
System Installation drawing, page A1 .
WARNING: Water reacts aggressively with isocyanate . Reactions
within a confined space such as within a hose may present a safety
concern . Even small amounts of water vapor may cause a blockage
or an adverse reaction . Water carried within the polyol hose to the
point where blending with isocyanate occurs must be avoided .
3.1 Initial Tank Set-up
1 . Be sure that the tanks are at the optimum temperature of
75-90 degrees F (24-32 degrees C) minimum 65 degrees F
(18 degrees C) . If they are below this range, utilize heating
blankets or a box heater to bring them up to the proper range .
This is very important! Consult your DuPont Rep or DuPont
Technical Service if you need assistance .
2 . Color code all hoses with electrical tape (the nitrogen and
chemical transfer hoses, as well as the gun) red for the A Side
(ISO) and blue for the B Side (Polyol) to prevent chemical
cross contamination . Place colored tape at each end of the
hoses for proper identification .
3 . Attach the nitrogen regulator to nitrogen tank .
a) Order a five (5) foot high nitrogen tank . At this height the
regulator is much easier to view .
b) Make sure nitrogen regulator handles are all turned out
(counterclockwise) until they cannot be turned any more .
This is the closed position .
c) Hand tighten the regulator to the tank and level the
regulator for easy viewing purposes .
d) Once level, fully tighten regulator with an adjustable
wrench . You will need about 30 lb-ft of force . Do not over
tighten .
4 . Attach the nitrogen hoses to the nitrogen regulator .
a) Remove the two protective caps from the nitrogen tank
regulator where the hoses will be connected .
b) The A side (red) should be on the operator's left side as
you are facing the nitrogen tank/regulator . Attach red/
yellow coded nitrogen hose to the regulator with about
30 lb-ft of force . Do not over tighten .
c) Note that all the hose connections are flare fittings . These
do not require any sealant or Teflon tape . They just need
to be tight . d ispenser clips the nozzle firmly in place .
d)
The B side (blue) should be on the operator's right side as
you are facing the nitrogen tank/regulator . Attach blue/
yellow-coded nitrogen hose to the regulator with about
30 lb-ft of force . Do not over tighten .
5 . Attach the nitrogen hoses to the chemical tank .
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Refill
a) Remove cap covers from chemical tank connection on the
A side (red) and attach nitrogen hose to the flare fitting on
the valve that is in a vertical position (pointing straight up
Tighten to about 30 lb-ft of force . Do not over tighten .
(Save the cap covers for when the tanks are returned
to DuPont .)
b) Remove cap from chemical tank connection on the B side
(blue) and attach nitrogen hose to the flare fitting on the
valve that is a vertical position (pointing straight up) .
Tighten to about 30 lb-ft of force . Do not over tighten .
(Save the cap covers for when the tanks are returned to
DuPont .)
6 . Attach the filters to the chemical valve connections .
a) Remove the chemical valve plug on the A side (red) .
Save the plug for return shipment to DuPont, just leave
inside the ring on the top of the tank . On the A side only,
it is necessary to clean the petroleum jelly from the inside
of the valve with a cotton swab . (If you don't have cotton
swabs, take the small cloth bag that the filter came in and
wrap it over the end of a screwdriver . Use this to clean
the petroleum jelly out of the valve .) Next, connect the
filter with the arrow (arrow is engraved on the valve)
flowing out or away from tank and tighten to about
30 lb-ft . Note that the filter is pipe thread and DOES
need sealant or Teflon tape . It should be taped from the
factory but just check to be sure .
b)
Remove the chemical valve plug on the B side (blue)
from the chemical tank . Save the plug for return shipment
to DuPont, again just leave it in the ring on the top of tank .
Connect filter with arrow (arrow is embossed on the valve)
flowing out or away from tank and then tighten to about
30 lb-ft . Again, this is pipe thread and DOES require seal-
ant or tape . Do not over tighten .
7 . Attach the ball valves to the chemical filters .
a) At the end of the filter, attach a ball valve . Tighten both
ball valves on the A and B side to about 30 lb-ft but do not
over tighten . Again, this is pipe thread .
8 . Attach the chemical hoses to the ball valve on the
chemical tanks .
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