What Type Of Steel Are Propane Tanks Made From?

A propane tank approved by the American Society of Mechanical Engineers (ASME) or a DOT propane gas cylinder can be used to store propane.

Welded steel or aluminum are used to construct portable tanks. These cylinders are usually small and portable and can be seen mounted to a BBQ or in an RV. Cylinders are used and replaced, or they can be refilled at refilling establishments or by qualified refillers with the proper equipment.

Welded steel is used to construct large propane tanks. These tanks are larger, heavier, and thicker than propane gas cylinders. These can be found at gas stations, businesses, and other isolated locations. Tank refilling is done on-site for ASME tanks, which are immovable.

What is the composition of propane tanks?

Did you realize that a propane tank and a propane cylinder are two different things?

Propane tanks are designed to hold large amounts of liquid propane (typically ranging from250 gallons up to 60,000 gallons). These steel storage tanks are approved by the American Society of Mechanical Engineers to meet the criteria needed to safely endure the temperatures, pressures, and environmental conditions required for propane storage in the United States. They can be installed horizontally or vertically, however the most frequent configuration is horizontal. Propane tanks are meant to be filled and delivered empty by propane bobtail delivery trucks or propane transports. As long as the system components (valves and gauges) are within their service period and the tank shell integrity is not jeopardized, ASME propane tanks can be utilized for storage (by rust, fire or physical damage).

Propane cylinders are used to store liquid propane in lesser volumes (usually between 1/4 gallon and 100 gallons). The most common material for these cylinders is steel, but they can also be built of aluminum or composite materials. Propane cylinders are certified by the US Department of Transportation because they are meant to be carried with propane inside of them (DOT). DOT cylinders are the most frequent name for them. Because cylinders are frequently transported on public roads without any hazardous materials certification, DOT certification criteria are required. The 20-pound propane cylinder is the most common, and it’s used for propane gas grills and patio heaters. DOT cylinders have a 12-year certification period and are stamped with their in-service date at the time of manufacture. They must be re-certified or retired from service after 12 years.

What is the steel thickness of a propane tank?

The internal diameter of a steel propane tank for a barbecue grill is 12 inches, and the wall thickness is 1/8 inch. The tank is pressured to 200 pounds per square inch.

Is it more common for propane tanks to be made of aluminum or steel?

You may have pondered if steel or aluminum tanks are the better option while looking for propane. Then composite fiberglass propane cylinders appeared on the market, and you may be unsure which is the best purchase. This breakdown will show you all of the distinctions between different propane tank alternatives, allowing you to choose the one that is best for you.

Propane Cowboy offers Composite See-Through LPG Propane Gas Cylinders!

Aluminum propane tanks are lighter than steel tanks and are less likely to rust or spark. Composite fiberglass propane cylinders are even lighter than metal tanks. They are also safer and more cost-effective.

BBQ Gas Bottle What is a Propane Tank?

A BBQ gas bottle, also known as a propane tank, is a steel receptacle used to store the common LPG gases, propane or butane. The smaller 45kg gas bottles, as well as the bigger 90kg and 210kg LPG gas bottles, are commonly used in homes and small enterprises.

BBQ gas bottles (propane tanks) are available in 9kg and 4kg sizes. Larger LPG tank sizes are available for high-volume consumers.

How LPG Cylinders are Made? How Propane Tanks Are Made?

The most popular gas cylinder material for an LPG cylinder or propane tank is welded steel, but aluminum, stainless steel, hot dipped galvanized steel, or composite materials can also be used.

To make a single steel cylinder, two half cylinder shapes are welded together and foot and neck rings are attached.

Composites are made up of a polyethylene (HDPE) inner liner, wrapped glass fibers and resin, and a polyethylene (HDPE) exterior casing.

Gas Cylinder Material What are LPG Tanks Made Of Propane Tank Material

LPG tanks are commonly made of steel, aluminum, galvanized steel, stainless steel, or composite materials, with the gas cylinder material (propane tank material) being steel, aluminum, galvanized steel, stainless steel, or composite materials.

The majority of LPG tanks are constructed of welded steel gas cylinder material (propane tank material). Steel is by far the most popular gas cylinder material used in LPG tanks, as it is both easy to build and inexpensive. LPG tanks, on the other hand, are built of two other gas cylinder materials: aluminum and composites.

Aluminum gas cylinder material is used in some LPG tanks (propane tank material). This is a regular occurrence with forklift cylinders when it comes to safe lifting. LPG tanks made of aluminum gas cylinder material are lighter, allowing for more gas while maintaining below safe lifting weight limitations.

Some LPG tanks (LPG cylinders) are manufactured of composite gas cylinder material, which is the most recent invention (propane tank material). Typically, these are made of fiberglass with an exterior shell made of high-impact plastic. Some have an HDPE inner lining, while others have a thin steel lining.

Starting with the Cylinder Body

The sheet is put through a powerful punch press, which produces circular blanks with a diameter of roughly 48cm (19 inches) (image below).

The circular blanks are next passed through a powerful hydraulic press, as seen below, which bends the steel disc into a half-cylinder shape.

It gets a crisp edge from an automated trimmer so the two parts may be welded together evenly and without gaps.

Cylinder Add-Ons

A threaded valve flange is fitted through a hole bored in the top of the cylinder, as shown.

The flange is welded to the top of the tank using an automated welding station, as seen in the following image.

Another automated welding machine is used to fuse the foot rings (below) to the bottom of the tank.

The neck ring is punched and produced from another strip of steel gas cylinder material, then welded to the top half of the tank in a similar manner.

The secondary bending that is done to make the gas bottle handle is the difference.

About the Valve

Because brass is deemed “non-sparking,” there is less risk of accidental ignition.

It’s built into the main valve and appears as a protrusion on the opposite side of the main connection.

Overfilling or exposure to high heat or fire can cause excess pressure, which can be relieved using pressure relief valves.

A PRV’s purpose is to prevent a cylinder from bursting in the unlikely event of severe pressure build-up.

The pressure relief valves are kept closed by a robust spring inside.

The valve will remain closed as long as the pressure is less than that of the spring.

Stamped On Information

A lot of critical information is stamped onto the steel of the neck ring.

  • The date of manufacturing is significant for referencing the tank re-testing date.

This information is stamped into the steel of the neck ring with a hydraulic stamp.

Additional date stamps will be necessary when the cylinder is retested in the future, therefore there is still room on the neck ring for them.

Final Assembly

The two tank parts are joined and welded together in a rotary welding station (shown below).

The entire tank gas cylinder material is then heat tempered in a furnace (as illustrated below) to ensure that it has the proper hardness for the expansion and contraction that occurs during pressurization.

Tanks are painted with electrostatically charged powdered paint on an automated electrostatic paint line, as shown in this image:


The weld seams are tested to ensure they are as robust as the adjacent steel.

To check for expansion, a water pressurisation test is performed.

This ensures that the heat tempering procedure was followed correctly.

Before the valve is installed, the tank is inspected internally with a small video camera to check for contamination or corrosion.

The last test involves pressurizing the tanks while they are submerged to check for leaks (see below).

Gas cylinders are constructed of what metal?

A cooking gas cylinder is 15-16 kg in weight and is composed of mild steel. The weight of a stainless steel cylinder will be half that, lowering shipping expenses.

Why are propane tanks so difficult to come by?

LOS ANGELES, Calif. (NewsNation Now) Due to the coronavirus epidemic, outside dining prohibitions have become a factor tied to propane cylinder shortages and a large increase in demand.

Is there a distinction between propane tanks?

Tanks, correct installation standards, legislation and procedures governing the repair of tanks and systems are all taught in the propane sector. It is critical that unlicensed individuals do not attempt to repair or modify their own tanks for the sake of safety and continued serviceability. Because the rules and safety standards in the propane business fluctuate, tank installation and maintenance should only be done by those who are aware with the LP Gas tank codes and regulations. This is something that cannot be overstated. NO PART OF AN LP GAS TANK OR THE GAS PIPING SYTEM SHOULD BE MOVED, REPAIRED, OR MODIFIED.

The material in this area is offered solely for consumer education reasons, with the goal of better familiarizing consumers with propane tanks and their components. For gas grills and forklifts, portable tanks, also known as bottles or cylinders, are utilized as a fuel supply. Stationary propane tanks are commonly found behind homes or businesses, providing all propane-fueled appliances. At bottle manufacturers, stationary tanks are also utilized to replenish cylinders and mobile containers.

Regardless of size, propane tanks contain propane liquid until it is used as a liquid or vapor. All tanks are subject to restrictions aimed at ensuring the safety of users, service technicians, and the general public, and can only be filled to around 80% of their capacity, which is considered a “full” tank. Many people mistakenly believe that propane and butane tanks are the same, but propane has a far higher pressure than butane. This means that, despite their similar appearances and linked connections, propane tanks are subjected to higher pressures, and the two types of tanks are in fact extremely different, and cannot be filled with either LP Gas. Propane tanks are only used to store propane. This section includes information on topics such as:

What to do with old propane tanks?

You may repurpose them and use them again. You can also receive new ones by exchanging them. Here’s a quick video showing how to make a fire pit out of a propane tank.

Can you weld on a propane tank?

Yes, you can weld a gas tank as long as you clean it thoroughly before getting started. Ensure that all of the gas has been removed from the tank and that the cylinder has been thoroughly cleansed with water several times. Even if you’ve performed the required cleaning procedure, use protective safety equipment to avoid injury if residual gas remains and sparks fly.

How thick is the metal on a propane tank?

The walls of most propane tanks are about a quarter of an inch thick. However, some tanks have a wall thickness of 3/8 inch or greater in some circumstances.

How to clean a propane tank from outside?

To clean the tank from the outside, simply use a garden hose and a brush. It is the most secure method of cleaning the cylinder. If you have one, you can also use a pressure washer.