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Technical Support Document

Crown Markings of a Standard CO2 Cylinder

October 4, 2001

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 to display these markings has changed. Shown below is a diagram of the current crown markings being stamped on the standard 20 # CO2 cylinders manufactured at Catalina Cylinders, Garden Grove, CA. The descriptions and the markings are the same regardless of the different stamping formats used over the years.

Crown Marking on a 20 # CO2 Cylinder:

TC-3ALM124BAR CATALINA T11.7KG
DOT-3AL1800FXXXXXXM4002 05*98 20#CO2 TW25.7LBS

Marking Description
TC-3ALM The Canadian regulatory authority, Transport Canada (TC), and specification, 3ALM, to which the cylinder is manufactured in compliance.
124BAR The metric service pressure, 124, and units of measure, BAR, of the cylinder.
CATALINA The name of the manufacturer of the cylinder.
T11.7KG The metric tare weight (in kgs) of the empty cylinder package. The empty cylinder package includes the cylinder, valve, the carrying handle and the snap ring.
DOT-3AL The U.S. regulatory authority, the Department of Transportation (DOT), and specification, 3AL, to which the cylinder is manufactured in compliance.
1800 The service pressure, in pounds per square inch (psi), of the cylinder.
FXXXXXX 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 six digit number.
M4002 The M-number or Manufacturers Number issued by the DOT to the manufacturer, Catalina Cylinders.
05*98 The original hydrostatic test date of the cylinder, month followed by year, performed at the time of manufacture of the cylinder. The "*" 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.
20#CO2 The cylinder identifier. The "CO2" denotes the cylinder is designed and intended for CO2 service and the "20#" denotes the maximum weight capacity of CO2 charge of this cylinder.
TW25.7LBS 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.


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