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Technical Support Document

Crown Markings of a Standard SCUBA 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 S80 (80 cu ft, 3000 psi) SCUBA 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 S80 (80 cu ft, 3000 psi) SCUBA Cylinder:

TC-3ALM207BAR CATALINA
DOT-3AL3000ASXXXXXXM4002 05*98 S80

Marking Description
TC-3ALM The Canadian regulatory authority, Transport Canada (TC), and specification, 3ALM, to which the cylinder is manufactured in compliance.
207BAR The metric service pressure, 207, and units of measure, BAR, of the cylinder.
CATALINA The name of the manufacturer of the cylinder.
DOT-3AL The U.S. regulatory authority, the Department of Transportation (DOT), and specification, 3AL, to which the cylinder is manufactured in compliance.
3000 The service pressure, in pounds per square inch (psi), of the cylinder.
ASXXXXXX The serial number of the cylinder. For Catalina Cylinders, the serial number prefix of "AS" is specific to the S80 (80 cu ft, 3000 psi) SCUBA 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.
S80 The cylinder identifier. The "S" denotes the cylinder is designed and intended for SCUBA service and the "80" denotes the cubic foot capacity of air of the cylinder.


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