Compressed natural gas is an alternative fuel source that is growing in popularity throughout the United States. Many companies have shifted their fleet’s fuel to this source because of CNG’s benefits, and more and more vehicle manufacturers are adding CNG as an option to their models. If you have a vehicle that uses compressed natural gas, you need to have the vessel inspected to ensure optimal performance. However, because CNG is relatively new, many vehicle owners are unsure of the inspection guidelines and process.

To help you become more informed, we’ve answered some of the most frequently asked questions regarding CNG vessel inspections.

What is a CNG vessel?

A CNG vessel is the place where the CNG is stored on a vehicle. Sometimes referred to as a tank or a cylinder, vessels are made of high-strength materials and must meet rigorous safety standards. Depending on the manufacturer, a vessel can last 15, 20, or 25 years before needing to be replaced.

When should I get my vessel inspected?

Once in service, a CNG vessel should be inspected every three years or 36,000 miles, whichever comes first. It should also be inspected after any collision that occurs over 5 mph, as any type of damage done to the vessel can cause leaking or other serious issues.

How long does an inspection take?

The length of the inspection will vary based on the make and model of the vehicle as well as the type, age, and condition of the vessel itself. In most cases, though, a full inspection can be completed in about two to three hours.

Who can perform an inspection?

Your vessel should always be inspected by a qualified CNG inspector. Ozinga has multiple CSA-certified inspectors who can perform your inspection for you at any of our facilities.

What are inspectors looking for?

During the inspection, the inspector will take the vessel out of your vehicle. He/she will look for any signs of defect, such as dents, cracks, holes, heat marks, gouging, or glazing. In addition, he/she will also inspect the PRD, perform a leak check, inspect the lines to and from the vessel, and also change or drain your filter.

What happens after the inspection?

After the inspection, your vessel will be labeled one of three levels: pass, in need of repair, or condemned. If your vessel passes the inspection, you will not need to come back for another inspection for three years, 36,000 miles, or in the event of a collision. If it’s in need of repair, you can discuss the options with your inspector. If it’s condemned, it will need to be taken out of service until proper repairs can be made.

What causes a vessel to be condemned?

There are multiple reasons why a vessel may be condemned, but the most common include major defects or that the vessel has reached its end of life.

How can I prove my vessel was inspected?

During every inspection, a sticker is placed on your vessel to prove that it has been inspected. The inspector will fill out these stickers with the appropriate information, and new stickers will be placed on your vessel for every inspection thereafter.

Since the stickers cannot be seen without removing the vessel, it’s important that vehicle owners keep a record of the most recent inspection and when the next one is due.

Ozinga has the CSA-certified inspectors and proper facilities to perform your CNG vessel inspection. Contact us today to schedule your appointment.