Cylinder requalification

Your cylinder needs to be requalified once every five years via a visual inspection by an approved requalifier. The information below will help you and your requalifier ensure that the process goes smoothly and as required by law.

Are you requalifying your cylinder?

We like to keep track of when and where our cylinders are being requalified. Please fill out this form and let us know where you requalified yours.

United States

The approval process is slightly different depending on the facility’s status with the DOT. In both cases, however, the inspection procedure is the same.

DOT approval procedure: for facilities with an existing RIN

Complete this application to visually requalify composite cylinders and submit it to the DOT (approvals@dot.gov). You may then proceed with inspecting composite cylinders.

Note: The DOT will contact you only if there is an issue or question regarding your application.

DOT approval procedure: for facilities without a RIN

Complete this application to obtain a RIN and submit it to the DOT (approvals@dot.gov). It will take two to four weeks for your application to be processed and a RIN to be issued. At that time, you may begin inspecting composite cylinders.

Inspection procedure

Use the instructions in the inspection document to inspect the cylinder. After inspection, a recertification sticker must be applied to the fiberglass dome, not the plastic casing.

Click here to download an example of a recertification sticker.

The DOT requires that you apply the recertification sticker using epoxy, which is available at any auto parts store. Place the sticker on the fiberglass dome, then coat it with the epoxy.

Note: There is no need to replace the valve or to pressure-test the cylinder. Viking Cylinders products may be requalified via visual inspection.

Canada

Our Transport Canada equivalency permit number is SU5931—you will see that number embossed on the top ring of our cylinders. This permit requires that our cylinders be requalified using section Q of the equivalency permit document. Use these instructions to visually inspect the cylinder and casing for damage.

After inspection, a recertification sticker must be applied to the fiberglass dome, not the plastic casing.  Apply the recertification sticker using epoxy, which is available at any auto parts store. Place the sticker on the fiberglass dome, then coat it with the epoxy.

The recertification sticker must include the month and year of inspection, as well as your facility number and the letter “E” (to indicate a visual inspection). It must also state that the inspection is good for five years.

Click here to download an example of a recertification sticker.

Note: There is no need to replace the valve or to pressure-test the cylinder. Viking Cylinders products may be requalified via visual inspection.