CHART Cryo-Cyl80HP, Product Manual

Page: 30 / 62

24
Operations Product Manual - Liquid Cylinders
Cryo-Cyl ® 80 HP Liquid Cylinders
The Cryo-Cyl 80 HP liquid cylinder is designed to transport
and store liquid oxygen, nitrogen, argon, carbon dioxide or
nitrous oxide and provides it as a gas. It is a smaller version
of the liquid cylinder that is designed to supply gas at lower
flow rates than the regular liquid cylinders. The Cryo-Cyl
liquid cylinder can provide gas at pressure up to 350 psi
(24.1 bar). This liquid cylinder will build and maintain an
operating pressure at the pressure building regulator setting
of 125 psi (8.6 bar).
If the operating pressure exceeds 125 psi (8.6 bar), the
pressure will be lowered as the gas is delivered. A separate
economizer regulator is not provided on the Cryo-Cyl 80
HP cylinder. A continuous gas flow can be automatically
provided from this cylinder.
Liquid can be withdrawn from the liquid cylinder in the
same manner that was described in the Dura-Cyl LP Liquid
Cylinder section of this manual
Filling Procedures
The Cryo-Cyl 80 HP liquid cylinder is regulated by the DOT
for transporting liquid oxygen, nitrogen, argon, CO
2
or N
2
O
The filling of these liquid cylinders must be done by product
weight. This will allow enough gas space above the liquid
to keep the liquid cylinder from becoming liquid full if its
pressure rises to the relief valve setting. The filling weight
table indicates the correct product weight for the various
relief valve settings The standard relief valve setting is 350
psi (24.1 bar). The filling procedure will explain the proper
way to use the filling weight table.
The liquid cylinders are equipped with liquid and vent valves
that are used during the filling procedure. The liquid valve is
equipped with a dip tube that extends into the inner vessel of
the cylinder and reaches to the bottom The vent valve has a
dip tube attached to it that also extends into the inner vessel
near the top of the cylinder.
Filling can be accomplished by pressure transfer. The
following procedure should be used:
1
Sample the residual gas that is in the cylinder. Purge the
cylinder if necessary to ensure the proper purity.
2
Place the cylinder on the filling scale. Record the
weight. Compare this weight to the registered tare
weight on the data plate. The difference is the weight of
the residual gas
3
Connect the transfer hose to the fill fitting. Record the
new weight The difference between this weight and the
initial weight is the weight of the transfer hose
4
To determine the total filling weight add the tare weight
of the cylinder, the hose weight and the proper filling
weight from the table (i.e. oxygen at 350 psi / 24 bar has
a product weight of 173 pounds / 78 kg).
5
Open the cylinder’s vent and liquid valves. Open the
transfer line shut-off valve to begin the flow of product.
6
When the scale reads the calculated total filling weight,
turn off the liquid valve on the cylinder Close the vent
valve
7 Close the transfer line shut-off valve and relieve the
pressure in the transfer line. Remove the transfer line.
Remove the cylinder from the scale
Operating Pressure
The Cryo-Cyl 80 HP liquid cylinder will automatically
maintain an operating pressure between the pressure building
regulator (125 psi / 8.6 bar) and the relief valve setting (35
psi / 24.1 bar). The lower limit of the operating pressure
can be set up or down by adjusting the pressure building
regulator The adjustment range of the regulator is between
75 and 175 psi (5.2 and 12.1 bar).
The gas delivery pressure should not be confused with the
vessel operating pressure. The delivery pressure should be
adjusted with a separate regulator that is attached to the gas
withdrawal fitting.
Gas Withdrawal
The Cryo-Cyl 80 HP liquid cylinder will deliver gas at
various flow rates and temperatures for different applications.
The flow rate is controlled by the equipment that is being
supplied gas from the liquid cylinder. The continuous flow
rate indicates the flow rate that will normally provide gas at a
reasonable temperature and should not be exceeded. Higher
flow rates may provide very cold gas that could damage the
equipment that they are attached to.
To supply gaseous product follow this step-by-step
procedure:
1
Connect the proper regulator to the Cryo-Cyl liquid
cylinder gas use outlet
2
Connect the proper hose between the final line regulator
and the receiving equipment.
3
Open the pressure building valve.
4
Allow pressure to build to the operating pressure (125
psi / 8.6 bar).