CNG Cylinder Inspection Labels

CNG cylinder inspection labels are applied to CNG cylinders to demonstrate the “Pass” or “Fail” result of a detailed CNG cylinder inspection. These inspections are required by the National Highway Transportation Safety Administration's (NHTSA) FMVSS 304 which states that a detailed visual inspection of all CNG cylinders must be conducted by qualified CNG fuel system inspectors every three years or 36,000 miles (whichever comes first) and after any fire or accident.  

During the inspection process, CNG fuel system inspectors must apply the appropriate inspection label to the CNG cylinder:

  • a blue “Passed Cylinder Inspection” label is used when cylinders exhibit Level 1 or no damage, and pass inspection
  • a “Failed Cylinder Inspection” label is used  when cylinders exhibit Level 2 or 3 damage, or  the manufacturers’ label is missing or obliterated such that positive identification is not possible

You can now order the CNG Cylinder Inspection labels online directly from our website for $2.50 per label. The labels are sold in packs of 20. 


Please contact us at 702-518-3415 or send an email to


Upcoming Training

Level 3: Heavy-Duty NGV
Maintenance and Diagnostics

December 4-5, 2017
Long Beach, CA

Level 2: CNG Fuel System
Inspector Training

December 6-7, 2017
Long Beach, CA

Level 1: NGV Essentials
and Safety Practices

January 30, 2018
Scottsdale, AZ

Level 2: CNG Fuel System
Inspector Training

January 31 - February 1, 2018
Scottsdale, AZ

Level 1: NGV Essentials
and Safety Practices

March 27, 2018
Bakersfield, CA

Level 2: CNG Fuel System
Inspector Training

March 28-29, 2018
Bakersfield, CA


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About NGVi

Natural Gas Vehicle Institute is North America’s leading provider of training and consulting on natural gas as a transportation fuel.

Our services address the full range of natural gas vehicle and fueling issues, including:

Technical consulting services – Sizing and designing compressed natural gas fueling stations, vehicle assessments and technical assistance for fleets, CNG fueling station troubleshooting, natural gas vehicle maintenance facilities upgrades, liquefied natural gas fleet and fueling management.

Technical training – NGV Essentials and Safety Practices, CNG Fuel System Inspector Training, Heavy-Duty NGV Maintenance and Diagnostics Training, Light-Duty NGV Maintenance and Diagnostics Training, CNG Fueling Station Operation and Maintenance Training, CNG Fueling Station Design Training and CNG/LNG Codes and Standards Training for Fire Marshals and Code Officials.


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