Propane Tank Recertification: How & Where To Get Recertified

What Are DOT Cylinders?

Let’s talk about keeping your RV propane tanks legal and safe, because nobody wants to deal with expired tanks when you’re trying to hit the road.

Those 20 and 30-pound tanks mounted on your travel trailer or hooked up to your grill are officially called DOT cylinders. The Department of Transportation regulates them because highly pressurized flammable gas traveling down the highway needs some oversight.

That’s why these portable tanks need periodic recertification. It’s the DOT’s way of making sure the tank strapped to your rig isn’t a rolling hazard.

Motorhomes are a different story. Their built-in tanks can’t just be swapped out, so they follow different rules. I’ll cover those ASME tank requirements below.

What exactly is propane tank recertification?

Think of it as a health checkup for your tank. You take it to a certified inspector who gives it a thorough examination, looking for anything that could spell trouble:

• Damage to the cylinder body like dents, cracks, rust, pitting, or signs of fire damage.
• Missing or damaged components like the foot ring, collar, or valve cover.
• Valve issues, including leaks or faulty pressure releases.
• Compromised welds or structural problems.

Pass the inspection, and your tank gets stamped with a new certification date. Depending on the inspection method used, you’ll be good for 5 to 10 years before the next checkup.

RV Life Hack: How To Check How Much Propane You Have Left

Table of Contents click to show What Are DOT Cylinders? What exactly is propane tank recertification? How To Recertify A Propane Tank Find A Propane Provider Swap Your Propane Tank Finding Propane Tank Certification Near Me How To Tell If A Propane Tank Needs To Be Recertified Manufacturing Date Propane Tank Recertification Stamp How Much Does Propane Tank Recertification Cost? New Propane Tanks vs Recertified Propane Tanks Propane Tank Inspection Volumetric Expansion Method Proof-Pressure Method External Visual Method Propane Tank Recertification Sticker What Are the Different Kinds of Propane Tanks? ASME Propane Tanks Getting A New Valve On A Propane Tank

How To Recertify A Propane Tank

Find A Propane Provider

The hardest part about getting a propane tank recertified is finding a place that will do it.

Your local hardware store or gas station that refills bottles probably can not recertify a propane tank. But many propane providers who install tanks and deliver propane often have the means to recertify.

Companies like AmeriGas are all over the US and are easy to find. Just make sure you call the local office to set up a time with them since propane tank recertification can take a while.

Swap Your Propane Tank

Another way you can get your old propane tank recertified that I actually recommend over trying to find a provider that can get it done is a propane tank swap. When you swap a propane tank, you get one that’s new or has been recertified recently.

There are propane tank swaps all over the place, even at small businesses and grocery stores. Most swaps that you see outside of stores are for smaller 20 lb grill tanks, but there are places that trade even larger 30 lb propane tanks.

I’ve been able to swap a 30 lb propane tank at local hardware stores and propane providers.

In fact, when calling to get a tank recertified, they recommended just swapping it with one that they had recently certified. I didn’t need to make an appointment, and the swap took only a few minutes.

See Also: What Does Oil In An RV Propane Regulator Mean? + How To Fix

Finding Propane Tank Certification Near Me

Sine not all businesses that sell propane can do propane tank certification. You will to need to find a propane company that specializes in propane. You can do a quick google search or check the local yellow pages to find propane services near you.

Make sure you call first to make sure they actually do recertification or to see if they can swap out your old propane tanks with recently recertified ones.

How To Tell If A Propane Tank Needs To Be Recertified

Safety is the most important thing with portable propane tanks. Checking your tanks regularly to make sure they are in good shape is the first thing you should be doing.

A DOT propane tank that has lost the ring on the bottom or the collar on the top will need to be fixed and recertified. Also, if there are any dents or damage to the body of the tank, have it checked just in case.

If the tank is in good condition, the easiest way to tell if certification is about to expire is to check the numbers stamped onto the outside of the collar. (The ring that protects the valve on top.)

Manufacturing Date

There will be a lot of numbers on the collar. Each means something different, but the first thing you should look for is the manufacturing date, which is normally 4 numbers. It’s just a month followed by the last two numbers in the year.

For example, a propane tank made a few years ago might have 0318 stamped on it. That means it was made in March 2018.

Since the cylinder isn’t old enough to have needed recertification, you won’t have to worry about it until 10 years from that date, which would be March 2028.

See Also: Best Small Portable Propane Heater For Indoor & RV Use

Propane Tank Recertification Stamp

If the tank has been recertified, there will be a requalification marking on the collar as well.

There are 3 certified ways to stamp recertification depending on how the recertification was done and by who.

In the graphic above, there are examples of two of the three different recertification codes that comprise numbers and letters.

The first two numbers represent the month the recertification took place. Here it was March. The next part, A 1 2 3 is an example of a RIN (Requalifier Identification Number). It’s the number the certified professional was given, and it’s how they can be identified if needed.

The next two numbers show the year. Here it was 2018.

If there are no markings after the code, the propane tank recertification type was a Volumetric Expansion test and the tank is good for another 10 years past the recertification date.

If there is an “E” or an “S” after the year code, like in example 2, then a different test was performed. The “E” shows an “External Visual Test” which means the propane tank certification is only good for 5 years. An “S” shows a “Proof-Pressure Test” which means the tank will be certified for another 10 years.

In Example 2, the test done was external, which means the propane tank was only certified for another 5 years.

The next graphic shows the 3rd type of recertification code you will find on a propane tank.

This code is used for external visual inspections, which are only good for 5 years.

The V followed by 6 numbers is the “Visual Identification Number” of the person who inspected the tank. The next four numbers are the month and year the inspection was done.

In this example, the inspection was done in March 2018. The “E” at the end means “External Visual Method.” That about sums up how to tell if a propane tank needs to be recertified.

You can read more in depth about what the different methods are later in this article, but the most important things to find are the date the propane tank recertification was done, and the method used.

If there’s an “E” at the end of either style of marking, you know your tank is only good for 5 years from the date.

See Also: Best Portable Propane Tabletop Grills & BBQs For Camping

How Much Does Propane Tank Recertification Cost?

DOT propane tank recertification usually costs around $40 – $60 depending the method used. External visual inspections are normally cheaper. If the valve on the propane tank was replaced, this may increase the price.

New Propane Tanks vs Recertified Propane Tanks

A new portable or DOT propane tank is normally certified for 10-12 years. They’re nice because there’s no rust or dings to worry about yet, but they aren’t very budget friendly.

You can get new propane tanks in stores or online (click here to view 20 lb tank on Amazon) or (click here to view 30 lb tank on Amazon).

Recertified propane tanks have been inspected and are just as safe as new propane tanks. They can be good for 5-10 years and often have new valves.

Swapping your old propane tank for a recertified one is the recommended way to go or you can get your old propane tank recertified by a certified inspector.

See Also: Our Review Of The Outland Firebowl Propane Fire Pit

Propane Tank Inspection

I talked about the different stamps on propane tanks that show the different methods used when inspecting propane tanks for recertification.

Here are the 3 different methods with an explanation for what they are and how long the certification is good for.

Volumetric Expansion Method

The Volumetric Expansion test is the most rigorous test a portable propane tank can go through.

The test is done using a “water jacket” for “hydrostatic testing.” A hydrostatic test will test the strength of the propane tank and check for any leaks or weak points.

The test is done by filling the propane tank with water that is pressurized 2x the normal amount. The tank is then put in a water tank to displace the pressure and make it easier to see if there are any leaks.

If a volumetric test is done when recertifying a propane tank, the certification will last for 10 years.

Proof-Pressure Method

The proof-pressure test is like the volumetric expansion test. Instead of water, air is being used to pressurize the tank to check for any weak points or leaks.

For this test, the propane tank will be filled with air to a level that is 2X the normal pressure amount. If the cylinder can handle the double pressure and there are no leaks, the recertification will be good for 10 years.

External Visual Method

Finally, the simplest test that can be done to recertify a propane tank is the external visual test. This is normally only done on propane tanks that appear to be in excellent condition and have no rust or scratches on the cylinder.

During an external visual test, a certified inspector will look for any damage, including bulges, rust, cracks, damage to welds, heat damage, or fire marks. They will also pay close attention to any kind of corrosion like rust or pitting. They will even look at the areas around the foot ring and collar.

Any DOT approved propane tank must have a foot ring, a collar, and a valve cover. The valve will also be checked for any defects or issues with the pressure relief valve. If the valve is an issue, the company doing the recertification can normally replace it for a fee.

An external visual test will only certify the tank for 5 years.

For a full explanation by the DOT about propane tank recertification check out this article on their website here.

Propane Tank Recertification Sticker

When certain recertification methods are done, like an External Visual Test, the certified inspector won’t always have the ability to stamp the metal on the collar. In this case, a sticker is used instead of a stamp.

A propane tank recertification sticker will have the license number of the inspector, followed by the month and year the certification was done. The date is normally followed by an “E” which is the code used to show an external visual inspection.

If your propane tank has one of these stickers, the certification is only good for 5 years after the inspection date. Do not remove any stickers on propane tanks, as they often show recertification.

See Also: How To Change An Automatic 2-Stage Dual RV Propane Regulator

What Are the Different Kinds of Propane Tanks?

There are lots of different propane tanks out there. You have the great big ones that sit outside of homes or businesses that are used for heating and gas stoves.

Or you have the kind that can be transported around. The portable kinds are what we have mostly focused on in this article.

For campers, there are two main kinds. You have the DOT propane tanks that we’ve covered pretty well already. They’re your 20 and 30 lb tanks you can carry around.

ASME Propane Tanks

The second type of propane tank you will find on a camper is the built in kind. These are normally found on motorhomes and vans.

A built in propane tank on a vehicle must be ASME (American Society Of Mechanical Engineers) certified. Because of the certification, permanent install RV propane tanks are commonly referred to as ASME tanks.

An ASME propane tank (click to view on Amazon) has the same purpose as a DOT tank, but there are a few key differences.

An ASME propane tank is built with thicker steel and welds. They are heavier than DOT tanks and they aren’t made to be carried around.

The biggest difference and benefit of an ASME propane tank is there is no recertification required after the initial manufacturing certification.

You should still do a visual inspection often and check for any damage to the tank to make sure it’s in safe working condition with no leaks. Otherwise, there is no need to take it to a propane supplier to be recertified.

The reason for this is the thicker materials used and the fact that the propane tank is never being carried or moved around by anything other than the vehicle it’s mounted to.

It seems a little strange since permanently mounted propane tanks on motorhomes are often exposed under the vehicle. They take their fair share of rocks, water, and road salt, but there is no law requiring them to be recertified.

See Also: Can RV Propane Lines Or Propane Regulators Freeze?

Getting A New Valve On A Propane Tank

A big part of propane tank recertification is checking the valve, and these valves aren’t as simple as they might seem. In addition to the knob you turn to turn on or off the propane, there is also a pressure relief valve on the back.

It’s there to release pressure in case the tank is overfilled and the gas inside expands past safe pressure levels.

There’s also an emergency shut off inside the valve that will stop the flow of propane from the tank if it detects an unregulated pressure release. This safety feature is the reason you can’t just open a propane tank to release the gas without a regulator or hose attached.

If this ever happens to you, the emergency valve can be reset by turning off the main valve and waiting for a few minutes. The emergency shut off can sometimes be accidentally engaged if the propane tank is opened too quickly.

That’s why it’s recommended to open a propane tank slowly, even when it’s connected to something like a grill or RV.

See Also: Is It Ok To Leave The RV Fridge On Propane While Driving?

Because of the complicated nature of propane tank valves and the need for them to be installed properly to withstand high pressure and be leak free, I don’t recommend replacing the valve yourself.

Luckily, most propane companies will replace propane valves and even recertify the tank at the same time. It normally costs around $50. The cost usually covers a new valve, installation, and sometimes even a propane refill.

It’s the safest way to go, and most towns have a propane provider that has this as part of their services.