Specifications

13
OPERATION OF CRYO-CYL 80 HP
51
Filling Procedures
The Cryo-Cyl 80 HP is regulated by the Department of
T
ransportation (US 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 al-
low 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
(pg 52) indicates the correct product weight for the var-
ious relief valve settings. The standard relief valve
setting is 350 psig (24.1 BAR). The filling procedure
will show the proper way to use the filling weight table.
The liquid cylinder is equipped with a liquid and vent
valve 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, refer to the illus-
tration on page 49:
1. Sample the residual gas that is in the cylinder.
Purge the cylinder (refer to the purging procedure,
page 58) if necessary to insure 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 (Item
206). Record the new weight. The difference be-
tween 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 (pg 52). The
table indicates the product across the top and
the relief valve pressure down the side. Connect
the two columns to find the proper weight.
Example: Oxygen at 350 psi has a product
weight of 173 pounds.
5. Open the cylinders vent (Item 198) and liquid
valves (Item 197). 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 (Item 197) on the
c
ylinder. Close the vent valve (Item 198).
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 will automatically maintain an op-
erating pressure between the pressure building
regulator (125 psi–8.6 BAR) and the relief valve setting
(350 psi–24.1 BAR). The lower limit of the operating
pressure can be set up or down by adjusting the pres-
sure building regulator. The adjustment range of the
regulator is between 75 and 175 psi (5.2 and 12.1 BAR).
Refer to section 16 for adjustment procedures.
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 at-
tached to the gas withdrawal fitting (Item 207).
Gas WithdrawaL
The Cryo-Cyl 80 HP will deliver gas at various flow
rates and temperatures (as shown in Figure J2 – page
13) for different applications. The flow rate is controlled
by the equipment that is being supplied gas from the
liquid cylinder. The continuous flow rate (as shown in
the specification, pages 14-16) indicates the flow rate
that will normally provide gas at a reasonable temper-
ature 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
80 HP gas use outlet (Item 207).
2.
Connect the proper hose between the final line
regulator and the receiving equipment.
3.
Open the pressure building valve (Item 203).
4. Allow pressure (refer to gauge Item 190) to build
to the operating pressure (125 psi–8.6 BAR).