Specifications

5
INTRODUCTION
8
General
The Chart Inc. Dura-Series cryogenic liquid cylinders
and the Cryo-Cyl Series cryogenic liquid cylinders (fig-
ure D) are double walled, vacuum and multi-layer
insulated cylinders designed for the transportation and
storage of liquefied gases. These liquid cylinders are
designed for the transportation and storage of cryo-
genic products which can be used as either gas or
liquid. All of the Dura-Cyl or Cryo-Cyl Series liquid
cylinders can be used for liquid argon, liquid
nitrogen, and liquid oxygen. The Dura-Cyl HP or
Cryo-Cyl HP can also be used for transporting liquid
carbon dioxide (CO
2
)
or liquid nitrous oxide (N
2
O).
The Cryo-Cyl Series liquid cylinders have model dis-
tinctions for low pressure liquid withdrawal (LP). For
Dura-Cyl series of liquid cylinders model distinctions
for medium pressure liquid and gas withdrawal (MP),
high pressure liquid and gas withdrawal (HP) and the
very high pressure liquid and gas withdrawal (VHP).
See section 6, Specifications, for more detail.
The Dura-Cyl/Cryo-Cyl series liquid cylinders also
have capacity distinctions; the number after their
name that designates net capacity in liters (the Dura-
Cyl 180 indicates 180 liters capacity). See section 6,
Specifications, for more detail.
The Dura-Cyl series of liquid cylinders have two styles
of pressure regulation, the LCCM pressure manifold
on the Dura-Cyl and the combination pressure regu-
lator on the Dura-Cyl MCR.
The portable liquid cylinders provide a reliable, con-
venient, and economical method for the transportation
and delivery of liquefied gas products. They are pri-
marily used as a self-contained gas supply. They can
be used with a variety of accessories such as the M-45
Manifold to provide larger gas storage capacities.
Refer to Section 17 for details on applications.
C
ylinder
D
esign
The Dura-Cyl/Cryo-Cyl Series liquid cylinders are de
-
signed, manufactured, and tested to the requirements
of the U.S. DOT and Transport Canada 4L specifica
-
tion. They are specifically authorized by the U.S.
Department of Transportation for the transporting of
liquid nitrogen, oxygen, argon, carbon dioxide, and
nitrous oxide. They are specifically authorized by
T
ransport Canada for the transporting of liquid nitro-
gen, oxygen, and argon. They are authorized by
T
ransport Canada for the transporting of carbon diox-
ide and nitrous oxide with an exemption.
The inner pressure vessel is constructed of stainless
steel and supported within an outer stainless steel
vacuum jacket. The support system is an all stainless
steel internal support, designed for low heat leak and
high strength.
The illustration in Figure E shows the major compo-
nents of the Dura-Cyl/Cryo-Cyl Series liquid cylinders.
The space between the inner and outer vessel makes
up the insulation system. Multiple-layer insulation and
high vacuum assures long holding time. The insulation
system is designed for long term vacuum retention
and is permanently sealed at the factory. The vacuum
space is protected from overpressurization by the
pump-out, based on the requirement of CGA 5-1.1-
2003. The pump-out also functions as the vacuum
port.
The outer vacuum jacket of the liquid cylinder contains
an internal vaporizer which converts the cold liquid to
gas. Refer to Section 6, figure I and J, for the gas with-
drawal curves. The internal pressure building system
allows for immediate use of the cylinder by automati-
cally building pressure to the preset operating
pressure and maintaining it there during gas with-
drawal. Refer to Section 6, figure H, for the pressure
builder's performance curves.
Each liquid cylinder is equipped with a stainless steel
ring to protect the plumbing components. The ring on
the Cryo-Cyl is connected to the cylinder with two han-
dling post; the Dura-Cyl uses four handling posts. The
posts have slots for ease in handling with a hand truck
or an overhead hoist. Hand trucks that can be supplied
by Chart are described in Section 17.
The Dura-Cyl/Cryo-Cyl Series cryogenic liquid cylinders
are constructed with all operating controls situated at
the top of the cylinder for ease in gas withdrawal and
liquid dispensing operations. In a stand-alone operating
environment it enables the user, through use of the vent,
liquid, pressure building, and pressure relief devices,
to completely control the liquid cylinder's operation.
To protect the inner pressure vessel from over pres
-
surization, the unit includes a safety pressure relief
valve. The liquid cylinders are further protected from