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All LPG tanks are pressure vessels.
They have to be designed to withstand the pressure held within. That means no corners, and, consequently no square or rectangular tanks. To understand why this is so, consider any type of Hot Water tank or Boiler. As pressure inside a square or rectangular shape is increased it will try and reform itself into a rounded shape, just like a Balloon does. This would result in failure at any corner. The design solution is to have no corners.

LPG Tanker life
Although static LPG storage tanks and proprietory gas cylinders ('bottles') have manadatory test periods (Ten years and Fifteen years respectively), Automotive LPG tanks are not subject to these checks. It has been assumed that any Automotive LPG tank will be scrapped along with the vehicle at the end its life, which is Ten years on average. .

All LPG tanks fitted by Go LPG! are made of 3/8" thick (8mm) steel and are far stronger than any Petrol or Diesel tank. The welded seams and joints are X ray tested early in the quality control process. Tanks are then tested to many times their ordinary working pressure, certified individually and must conform to EEC Directive R67/01.
Tank Shape

LPG tanks are only supplied as Cylinders or Toroidals (Polo Mint Shaped).