Gas Cylinder Manufacturing: From Snelling to ABB Robots

Gas cylinder manufacturing turns flat steel sheet into pressure vessels that must hold liquefied petroleum gas through years of refills. Every cylinder needs sound welds, a tested wall and a valve that seals, so the work is repeated by the million and checked one unit at a time. This post follows the cylinder from the first propane bottles of the 1910s to welding lines and robots, covers a September 2026 US ruling that touches cylinder design, and asks where ABB robots fit. We found no ABB customer welding LPG cylinder bodies, so that part is a possibility.

Caged LPG cylinders beside a red CO2 extinguisher. Photo: Kullatan Kin / Wikimedia Commons (CC0)

When propane first went into steel bottles

In 1910 Walter Snelling of the US Bureau of Mines pointed to propane as a volatile part of gasoline, and the American propane industry grew from that finding. Early reports described storing the liquefied gas in steel bottles, with one bottle carrying enough gas to light an ordinary home for three weeks. Snelling, Frank Peterson and the Kerr brothers formed American Gasol Co., described as the first commercial propane marketer, and Snelling's process patent was issued in 1913. The partners sold the company that year for 50,000 dollars to the Consolidated Gas Company of New York, because early profits were weak.

A gas cylinder filling room full of pipework and machinery, in a pre-1914 photograph from the RAE collection. Photo: Unknown author via Wikimedia Commons (public domain)

Steel bottles were already in use for other gases. A pre-1914 photograph in the RAE collection shows a gas cylinder filling room full of pipework and machinery, and a second shows men gathered around a cylinder at a test. Nothing in the sources we found says who first welded LPG cylinders by machine, so we leave that date open. What the photographs show is the routine that has not changed: fill, test and check every vessel before it goes out.

Men gather around a gas cylinder test, in a pre-1914 photograph from the RAE collection. Photo: Unknown author via Wikimedia Commons (public domain)

By the 1930s the propane supply chain had taken shape, with railroad tank cars, odorized gas so leaks could be smelled, and local bottle-filling plants. A mid-century postcard from Nationwide Specialty Co. of a butane gas service in Lebanon, Tennessee, shows what that looked like from the road, with pumps for fuel and a sign for bottled gas. Each filling plant needed a steady supply of empty bottles, which is the demand cylinder makers grew to serve.

A butane gas service station in Lebanon, Tennessee, on a mid-century postcard. Photo: Nationwide Specialty Co. via Wikimedia Commons (public domain)

How a cylinder line works today

The newest news is regulatory. In September 2026 the US Pipeline and Hazardous Materials Safety Administration ruled that federal law preempts California's rule on reusable propane cylinders. California's SB 1280 would have banned selling most non-refillable, generally one pound propane cylinders from 1 January 2028. Cylinder maker Worthington Enterprises had asked for the ruling, and California's attorney general opposed it. The agency said local design and manufacturing requirements for a container create a fragmented patchwork. CBS News reported the ruling on 11 September.

A pierceable butane and propane camping cartridge, a single-use gas container. Photo: Dmitry G / Wikimedia Commons (CC BY-SA 3.0)

Vendors describe a typical LPG line in stages: blanking and body forming, welding with heat treatment and hydrostatic testing, valve guard and foot ring, valve neck, coating, and a final pneumatic test. Wuxi Longterm Machinery sells it turnkey, with a fully automatic welding line and automatic hydrostatic testing, though these are vendor claims. A thesis from Indonesia argues that manual welding of 3 kg cylinder bodies is slow and inconsistent. At ALUGAS in Germany, two Yaskawa Motoman robots weld about 1,000 valve sockets a day onto aluminium LPG cylinders, so robots already do this work, though not ABB's.

Two LPG cylinders with regulators beside a wall in Korea. Photo: Mykim5902 / Wikimedia Commons (CC BY-SA 4.0)

Where does ABB fit? We found no ABB robot welding LPG cylinder bodies. The nearest link is valves: ABB delivered its 20th robot to Müller Gas Equipment in Sønderborg, Denmark, a cylinder valve maker, and says the robots lifted output by 25 percent over about a decade. For bodies, an arc welding robot such as the IRB 1600ID, with its cables routed inside the arm, could weld seams or foot rings on a positioner that turns the cylinder. Related welding work is covered in our posts on fire extinguisher manufacturing and hydraulic cylinders.

An ABB IRB 1600ID robot welding a hoist mast section on a positioner at STROS in the Czech Republic. Photo: ABB

What comes next for cylinder lines

A cylinder holds gas under pressure, so a bad seam is a safety problem more than a cosmetic one. That raises the value of repeatable welds, and a positioner lets the robot keep the torch angle the same around a round part. ABB sells positioners that turn heavy parts under an arc welding robot, as the workshop picture shows. Programs for a family of cylinder sizes can be built and tested offline in RobotStudio before the line is stopped for a changeover. The same software can check torch reach and path while the cylinder turns on the positioner, long before a real part is welded.

An ABB arc welding robot with a positioner that turns heavy parts. Photo: Ana 2016 / Wikimedia Commons (CC BY-SA 4.0)

People stay in the loop on many ABB welding cells. At Katcon in Warsaw an operator loads parts into a fixture at an ABB FlexArc cell, a layout used for exhaust systems, and the same split could suit cylinder fittings such as valve guards and foot rings. Heavy finished cylinders also have to be stacked and shipped, and ABB palletizing robots do that work in other plants. Hydrostatic tests and valve fitting remain separate stations that need handling, weighing and traceability.

An operator loads parts into a fixture at an ABB FlexArc cell at Katcon in Warsaw. Photo: ABB

The open problems are cost, product mix and rules. A line built for one cylinder size is hard to change, and the California case shows that design rules can shift between single-use and refillable formats. The PHMSA ruling removes one pressure for now, but whether other states try similar rules is not settled. Smaller makers also need people who can program and maintain a welding cell. Watch for a named ABB cylinder body line, a published weld inspection result or a state that tries a new rule.

Two propane cylinders fitted with regulators at a house in Japan. Photo: takami torao / Wikimedia Commons (public domain)

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