XL-65 and XL-65HP
Flow Diagram
Note:
The economizer and
pressure building
functions are
controlled by a single
dual action regulator.
The pressure delta
between the pressure
building setpoint and
the economizer
setpoint is
approximately 20 psig
(1.4 bar/138 kPa). This
delta cannot be
altered.
Pressure Building is not normally required unless container
pressure drops below the gas output pressure desired. If, for
example, the container pressure gauge reads 250 psig (17.2
bar/1724 kPa), and your gas pressure requirement is 270 psig
(19 bar/1860 kPa), and the pressure building valve may be
opened to build container pressure to 300 psig (20.7 bar/2068
kPa).
Economizer –
An economizer circuit withdraws gas preferen-
tially from the head space over the liquid container – gas that
would otherwise be lost to venting. Excess pressure in the
head space of the container is relieved by allowing gas to flow
from this area directly to the USE valve outlets while gas is
being withdrawn from the container; yet normal operating pres-
sure is preserved to ensure uninterrupted product delivery. The
economizer is automatic and requires no operator attention.
The USE Valve –
This valve controls the gas outlet that allows
product withdrawal through the internal vaporizer. It has the
required CGA connection that matches the gas service for which
the container is configured.
The LIQUID Valve –
Liquid product is added or withdrawn
from the container through the connection controlled by this
valve. It has the CGA fitting that is required for liquid line connec-
tions. The valve is opened for fill or liquid withdrawal after connecting a transfer hose with
compatible fittings to the LIQUID line connection.
The Pressure Building Valve –
This valve isolates the liquid in the bottom of the con-
tainer to the Dual Pressure Building/Economizer Regulator. This valve must be open to
build pressure inside the container.
The VENT Valve
– This valve controls a line into the head space of the container. It is
used during the fill process. The VENT valve acts as a fill point during a pump transfer, or
to vent the head space area while liquid is filling the inner container during a pressure
transfer fill through the LIQUID valve.
The Pressure Gauge
– The pressure gauge displays the internal container pressure in
pounds-per-square-inch or in kiloPascals.
The Full View Contents Gauge
– The container contents gauge is a float type liquid
level sensor that indicates container liquid content through a magnetic coupling to a
yellow indicator band. This gauge is an indication of approximate container contents only
and should not be used for filling; liquid cylinders should be filled by weight.
Relief Devices
–
This cylinder has a gas service relief valve and inner container bursting
disc with settings of 350 psig (24 bar/2413 kPa) and 525 psig (36 bar/3620 kPa) respec-
tively for the XL-65HP and 230 psig (16 bar/1586 kPa) and 380 psig (26 bar/2620 kPa)
respectively for the XL-65. A relief valve of 22 psig (1.5 bar/153 kPa) is available if low
pressure operation is desired. Alternate pressure building regulator and economizer set-
tings are required if medium-pressure relief valves are installed.
