Cylinder Markings - Europe 

Aluminum Cylinders for CO₂:

Row 1 

• Thread specification
• Country of manufacture
• Cylinder manufacturer
• Cylinder type number and serial number
• Alloy used in construction

Row 2 

• Design’s minimum wall thickness
• Empty weight of cylinder only (kg)
• Minimum internal capacity of cylinder
• Test/working pressure
• Empty weight of cylinder and valve (kg)
• Maximum charge weight

Row 3 

• Mark of conformance to TPED 1999/36/EC and reference number of TPED notified body
• Pattern approval number
• Country of TPED approval
• Authorized stamp of TPED notified body
• Year/month of initial test

Aluminum Cylinders for Air:

Row 1 

• Thread specification
• Country of manufacture
• Cylinder manufacturer
• Cylinder type number and serial number
• Alloy used in construction

Row 2 

• Design’s minimum wall thickness
• Empty weight of cylinder only (kg)
• Minimum internal capacity of cylinder
• Test/working pressure
• Empty weight of cylinder and valve (kg)
• Maximum charge weight

Row 3 

• Mark of conformance to TPED 1999/36/EC and reference number of TPED notified body
• Pattern approval number
• Country of TPED approval
• Authorized stamp of TPED notified body
• Year/month of initial test

Composite Cylinders :

(The markings of carbon-composite cylinders appear on the cylinder’s label)

Line 1

• Thread specification
• Country of manufacture
• Cylinder manufacturer
• Serial number (can also appear on cylinder neck)
• United Nations identification number for gas (e.g., 1002 is compressed air)

Line 2

• Empty weight of cylinder
• Minimum internal capacity (liters)
• Working pressure (PW) and test pressure (PH)
• Aluminum alloy used for liner construction

Line 3

• Design specification
• ADR approval number
• Country of approval (e.g., Germany )
• Mark of conformity for TPED and notified body reference number (e.g., 0035 is TUEV)
• Stamp of TPED notified body (e.g., TUEV)
• Year/month of initial test
• Manufacturer’s mark
• Year of retest

Line 4

• Design life of the cylinder

Cylinder Markings - United States

Composite Cylinders for Compressed Air:

(The markings of carbon-composite cylinders appear on the cylinder’s label)

Line 1

• Transport Canada
• Canadian exemption number (design specification)
• Charge pressure (bar)

Line 2

• DOT exemption number (US design specification)
• Charge pressure (psi)

Line 3

• Serial number
• Manufacturer

Line 4

• Month and year of initial pressure test and mark of independent inspection body (e.g., Arrowhead Industrial Services Ltd.)
• Reference to type of fiber used in composite wrap

Aluminum Cylinders for Both Air and CO₂:

Line 1

• Transport Canada and Canadian design specification
• Charge pressure (bar)

Line 2

• Department of Transportation and US design specification
• Charge pressure (psi)
• Serial number
• Manufacturer
• Month and year of initial pressure test and mark of independent inspection body (e.g., Arrowhead Industrial Services Ltd.)