15/24
GrainPro
®
Gas-Hermetic Fumigation/Self-Verifying Cocoon™ Instruction Manual
MA2021TDB1199-19
d. Open the outlet port located at the
back (top) of the G-HF Cocoonto
relieve excess pressure and to
release air from inside.
e. A Snap-on standard high-pressure
hose (not supplied/separate item)
should be connected between the
cylinder and the gas inlet port. This
hose should be guaranteed to
withstand
a
pressure
of
88
atmospheres (1,300 psi, or 92
kg/cm
2
). Ensure that all connections
are made properly and gaskets are in
place where they are required. The
high-pressure hose should have a
length of about 2-meter to facilitate
easy connection to the inlet valve.
f. Open the gas inlet port of the G-HF
Cocoon and then open the cylinder
tap. The cylinder tap should only be
turned to a point where you can hear
the liquid pass through the hose into
the G-HF Cocoon. The liquid CO
2
flushes into the G-HF Cocoon and
evaporates
inside
through
the
expansion pipe and will push the air
upward starting from the bottom core,
following the piston effect, until the air
is totally replaced.
5.9.3. Ice formation along the pressurized hose
and the pipe connector during CO
2
flushing:
a. During this procedure, some ice may
form around the gas inlet port and
high pressure hose.
b. If this happens do not touch the PVC
liner at this point because it becomes
brittle, loses flexibility and may crack!
c. Flushing (emptying of the cylinder) depends on the amount of CO
2
to be applied. Emptying
one 22kg cylinder should only take about 20 to 30 minutes. If the pressure hose or the inlet
valve gets blocked with ice, this is an indication that the CO
2
is being released too quickly.
If this happens the cylinder should be closed until the ice melts, and then the cylinder tap
should be re-opened and adjusted to reduce the flow.
d. An additional indication that the gas is being released too quickly is when the G-HF Cocoon
begins to balloon out because pressure begins to build-up inside. If this happens, the gas
flow should be decreased at the cylinder tap until the rate of air being expelled through the
outlet port is about the same as the rate of CO
2
entering the G-HF Cocoon.
e. If necessary, for small scale applications and the cylinder is not inverted, weighing scales
may be used to control the weight of the gas delivered. In this case the gas is released
slowly, through a pressure gauge adjusted to control the flow-rate.