39
TroubleshootingProduct Manual - Orca
™
CO
2
Series MicroBulk Delivery System
Symptom Possible Cause Remedy
Tank builds excess
pressure or builds
pressure too fast
Low usage
Tank is over-filled
If daily usage is less than the NER, the tank will
build pressure.
If the tank is filled past the vent trycock or past
the DOT specified fill weight, the pressure may
rise rapidly after a fill
Tank pressure is
too low or does not
build pressure at a
sufficient rate
Tank is leaking. Check for frost anywhere on the plumbing or
near the pressure reliefs. Spray soap solution on
joints to test for leaks. Repair leaks if possible
otherwise call Chart for assistance.
Tank is contaminated with moisture or CO
2
byproducts. Contaminants such as water will freeze in
solution with liquid CO
2
preventing adequate
flow of product into the pressure building coil.
After the tank has been emptied, purge the tank
with 50°C - 100°C nitrogen for 12 hours or more.
Purge CO
2
byproducts out through the liquid fill
line. After donning safety glasses and gloves,
place a rag over the fill line outlet and open the
valve briefly. Inspect the cloth for discoloration
or impurities. Repeat until all impurities are
removed.
Carbon dioxide ice in tank If the pressure in the tank drops below 61 psi, dry
ice slush will form in the tank which will restrict
liquid CO
2
from entering the pressure building
coil. To liquefy solid CO
2
, pressurize the tank
using an outside source to 300 psi. Each pound
of frozen CO
2
will consume one pound of dry CO
2
gas. For example, if the unit had 50 pounds of
solid CO
2
, it would consume the contents of one
50 lb high-pressure cylinder. Liquefaction is a
slow process. It takes 30 minutes to liquefy each
pound of solid CO
2
.
Frost occurs
around the
plumbing
Tank is being used
Frost is residual from last fill or earlier use
This is normal if the tank is receiving or delivering
CO
2
.
This is normal. Frost may remain on the plumbing
for hours after a fill or heavy use.
Frost occurs on
hose or hose reel
Residual frost from last fill or recent use This is normal. Ice may remain for hours after a
fill or heavy use.
Flow meter not
working
Water ice in phase lines to transmitters
Carbon dioxide ice in phase lines to transmitters
If any moisture is found in the CO
2
supply, it
will make its way to the DP transmitter phase
lines and immediately block them. To purge the
moisture, remove each phase line and force warm
nitrogen through them.
To avoid dry ice forming in the DP transmitter
phase lines, pressurize the metering section with
CO
2
gas above 70 psi before introducing liquid
CO
2
.
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