Specifications

10
OPERATION OF DURA-CYL 160 / 180 / 200 / 230 / 265 MP
33
F
illing Procedures
The Dura-Cyl MP is regulated by the Department of
Transportation (US DOT/Transport Canada) for trans-
porting liquid oxygen, nitrogen or argon. The filling of
this liquid cylinder 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 (pgs 35 &36) indicates the correct prod-
uct weight for the various relief valve settings. The
standard relief valve setting is 230 psig (15.9 BAR).
The filling procedure will show the proper way to use
the filling weight table.
The Dura-Cyl MP is equipped with a liquid and vent
valve that are used during the filling procedure. The liq-
uid valve is equipped with a dip tube that extends into
the inner vessel of the cylinder and reaches to the bot-
tom. The vent valve has a dip tube attached to it that
also extends into the inner vessel of the cylinder. This
vent tube is designed to spray the liquid into the top of
the vessel so that pump filling through the vent valve
will keep head pressure down in the cylinder.
Filling can be accomplished by either pressure transfer
or pump fill. The following procedure is for a pressure
transfer fill, refer to the illustration on page 31.
1. Sample the residual gas that is in the cylinder.
Purge the cylinder (refer to the purging proce-
dure, 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 regis-
tered tare weight on the data plate. The
d
ifference is the weight of the residual gas.
3. Connect the transfer hose to the fill valve
(Item 103). 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 (pg 35).
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: The Dura-Cyl 160 MP for
Oxygen at 230 psi has a product weight of 379
pounds.
5. Open the cylinders vent (Item 104) and liquid
(Item 103) 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 103) on
the cylinder. Close the vent valve (Item 104).
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.