Crown Markings of a Medical Oxygen Cylinder

The Department of Transportation (DOT) and Transport Canada (TC) require that a cylinder made in compliance with 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 a few times. Shown below is an example of the current crown marking stamped on the standard medical “E” cylinders (24 cuft 2015 psi) manufactured by 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 information provided by the markings is the same, regardless of the different stamping formats used by Catalina Cylinders over the years.

 

Example of crown marking of an “ME” cylinder manufactured at Catalina Cylinders:

 


DOT-3AL2015..MMXXXXXXX M4002 07C08 CATALINA M24 U12 Oxygen Symbol TC-3ALM139

 

Marking Explanation of Marking
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).
2015 The service pressure “2015“, in pounds per square inch (psi), of the cylinder (required mark).
MMXXXXXXX The cylinder serial number. The serial number prefix of “MM” is specific to the 24 cuft 2015 psi medical oxygen cylinder, manufactured at Catalina Cylinders, Garden Grove, California facility, followed by a seven-digit number (required mark).
M4002 The DOT Manufacturers Number (M-Number) “M4002” issued to Catalina Cylinders, Garden Grove, California facility (required mark).
07C08 The original hydrostatic test date of the cylinder, month “07” followed by the year “08“, 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).
CATALINA The name of the manufacturer of the cylinder.
M24 The cylinder identifier. Identifies the cylinder is designed for medical service “M” with a capacity of 24 cu ft “24” of oxygen, hence M24.
U12 The cylinder outlet thread designation as specified in CGA TB-16.
Oxygen Symbol Actually an “O” with a “2” inside the “O” signifies that the cylinder is for oxygen service and the lot of cylinders was subjected to residual hydrocarbon testing.
TC-3ALM The Canadian regulatory authority, Transport Canada “TC” and specification “3ALM” to which the cylinder is manufactured in compliance (required mark).
139 The service pressure “139” (in bars) of the cylinder (required mark).

 

 

 

Crown Marking Diagram Catalina East Division (Hampton, Virginia)Medical “E” Cylinder

DOT-3AL 2015 ASXXXXXXX O2 M1039 07C08 TC-3ALM139

 

Marking Explanation of Marking
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).
2015 The service pressure “2015“, in pounds per square inch (psi), of the cylinder (required mark).
ASXXXXXXX The cylinder serial number. The serial number prefix of “AS” is specific to the 24 cuft 2015 psi medical oxygen cylinder, manufactured at the Catalina East Division, Hampton, Virginia facility, followed by a seven-digit number (required mark).
O2 The “O2” signifies that the cylinder is for oxygen service and the lot of cylinders was subjected to residual hydrocarbon testing (required mark).
M1039 The DOT recognized Manufacturer’s Symbol “M1039“, an acceptable alternative to the DOT M-Number issued to Catalina East Division, Hampton, Virginia facility (required mark).
07C08 The original hydrostatic test date of the cylinder, month “07“, followed by the year “08“, 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).
TC-3ALM The Canadian regulatory authority, Transport Canada “TC” and specification “3ALM” to which the cylinder is manufactured in compliance (required mark).
139 The service pressure “139” (in bars) of the cylinder (required mark).

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