Green does not mean acetylene. From my supplier, it is orange and oxygen,
nitrogen, argon are all green as are some others.
I could not find a definitive color for industrial gas chart, but did find
this from Air Products
. Virtually all steel cylinder bodies are painted
uniformly dark blue and covered with a
protective plastic diamond mesh.
. A cylinder neck ring is permanently fixed
below the base of the valve. Each cylinder
neck ring is color-coded to help identify
cylinder contents and gas category (e.g.,
yellow for corrosive, red for flammables).
. A color-coded shoulder label indicates the
product's shipping name and identification
number. On pure products, a grade label is
also applied to the cylinder shoulder. The
color-coded label border correlates with
neck ring color for product identification.
The shoulder label also specifies gas grade
. Some cylinders are painted with a vertical
stencil identifying cylinder contents
Medical cylinders will be color coded
Table 1 - Standard names and identifying container colors for medical gases
Medical Carbon Dioxide
Medical Nitrous Oxide
Mixture or blend of medical gases
Standard colors for each component
Outside of medical, there is no standard color code for gas cylinders.
Different companies use different colors and even the same company uses
different colors. I've had Argon cylinders in teal, maroon, brown and
black all the same size and all from the same company.
They deal with safety by the connection into the valves. There are
well over a dozen CGA standards for the connection to cylinders, each
for a classes of gasses. It is pretty hard to connect up the wrong
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