Specifications

8
OPERATION OF CRYO-CYL 120 /180 / 230 LP
23
Filling Procedures
The Cryo-Cyl LP is equipped with a Liquid and Vent
v
alve that are used for filling. Use a pressure trans-
fer fill as the proper filling method for this style of
cylinder. The delivery tank pressure should be as low
as practical for the transfer to be efficient. Use the fol-
lowing procedure.
CAUTION: Before making a liquid transfer be sure
that protective eyeglasses and gloves are being worn.
1. Sample the residual gas that is in the cylinder.
Purge the cylinder if necessary to insure the
proper purity.
2. Place the cylinder on the filling scale. Record
the weight. Compare this weight to the regis-
tered tare weight on the data plate. The
difference is the weight of the residual gas.
3. Connect the transfer hose to the fill valve
(Item 1). Record the new weight. The differ-
ence 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. The table in-
dicates the product across the top and the
liquid cylinder model down the side. Connect
the two columns to find the proper weight.
Example: The Cryo-Cyl 120 LP for oxygen at
22 psi (1.5 BAR) has a product weight of 285
pounds (129 Kg.).
5. Open the cylinders vent (Item 3) and liquid
(Item 1) 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 (Item 1) on the
cylinder. Close the vent valve (Item 3).
7. Close the transfer line shut-off valve and re-
lieve the pressure in the transfer line. Remove
the transfer line. Remove the cylinder from the
scale.
CAUTION: The transfer hose will have pressure in
it that must be relieved before the hose is completely
removed.
Operating Pressure
The liquid cylinder will maintain a normal operating
pressure of 22 psig (1.5 BAR). Normal liquid with-
drawal operations are performed at lower pressure to
reduce flash-off losses and splashing. Transfer of liq
-
uid at higher pressures can lead to excessive
splashing of the cryogenic liquid which could result in
burns to the operator and/or nearby personnel. All
personnel should be fully instructed in the cautions
associated with handling cryogenic fluids and the
proper clothing and protective gear to be used.
Liquid Withdrawal
Cryogenic liquid can be pressure transferred from
the liquid cylinder to other cryogenic equipment that
operates at a lower pressure than the liquid cylin-
der. To make a liquid transfer follow this procedure:
CAUTION: Before making a liquid transfer be sure
that protective eyeglasses and gloves are being
worn. If the transfer is being made to an open top
vessel, the transfer pressure should be as low as
possible and a phase separator should be used to
eliminate splashing and hose whip.