Crown Markings of a CO2 Cylinder

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Technical Support Document

Crown Markings of a Standard CO₂ Cylinder

July 12, 2008

The Department of Transportation (DOT)and Transport Canada (TC) require that cylinders made in compliance to their specifications be marked on the crown with certain information. Over the years the format used by Catalina Cylinders and Cliff Impact Division of Catalina Cylinders to display these markings has changed a few times. Shown below is an example of the current crown marking stamped on the standard 20 # CO₂ cylinders manufactured at Catalina Cylinders, Garden Grove, CA. Under the example of the crown marking is a list of each of the specific crown markings, followed by a brief explanation of that marking. The descriptions of the markings are the same regardless of the different stamping formats used over the years.

Example of crown markings on a 20 # CO₂ Cylinder:

DOT-3AL1800FXXXXXXX M4002 07C08 B20 U18 T25.2LB TC-3ALM124 T11.5KG CATALINA

Marking		Description
DOT-3AL		The U.S. regulatory authority, the Department of Transportation (DOT), and specification, 3AL, to which the cylinder is manufactured in compliance(required mark).
1800		The service pressure, in pounds per square inch (psi), of the cylinder (required mark).
FXXXXXXX		The serial number of the cylinder. For Catalina Cylinders, the serial number prefix of "F" is specific to the 20# CO₂ cylinders followed by a seven digit number.
M4002		The M-number or Manufacturers Number issued by the DOT to the manufacturer, Catalina Cylinders.
07C08		The original hydrostatic test date of the cylinder, month followed by year, performed at the time of manufacture of the cylinder. The C represents the symbol of the Independent Inspection Agency (IIA) performing the inspection of and certifying the acceptance of the cylinder at the time of manufacture (required mark).
B20		The cylinder identifier (product name). It identifies the market, "B" for beverage, and capacity "20" for a capacity of 20# of CO₂ charge, of the cylinder.
U18		The cylinder outlet thread designation as specified in CGA TB-16.
T25.2LB or TW25.0LBS		The tare weight (in lbs.) of the empty cylinder package. The empty cylinder package includes the cylinder, the valve, the carrying handle and the snap ring (required mark).
TC-3ALM		The Canadian regulatory authority, Transport Canada (TC), and specification, 3ALM, to which the cylinder is manufactured in compliance (required mark).
124		The service pressure of the cylinder expressed in metric units, bars (required mark).
CATALINA		The name of the manufacturer of the cylinder.
T11.5KG		The metric tare weight (in kgs) of the empty cylinder package. The empty cylinder package includes the cylinder, the valve, the carrying handle and the snap ring.

Catalina Cylinders - West
Corporate Headquarters
7300 Anaconda Avenue
Garden Grove, California 92841 USA
Phone: (714) 890-0999
Fax: (714) 890-1744

Catalina Cylinders - East
Cliff Impact Division
2400 Aluminum Avenue
Hampton, Virginia 23661 USA
Phone: (757) 896-9100
Fax: (757) 896-9143

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