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To reduce the stress concentration at the sharp edges of the others shape like rec. sqr. trin. or any other shape. the Best shape is to use spherical shape but it seems not possible . In refineries the big spherical containers are used for storage , but for distribution purpose the cylindrical shape is the most suitable shape.

 

Regards,

Aftab

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Few points

Hemispherical ends are used to reduce the stress concentration

Cylindrical shape along its lenght is used to store more amount of gas or fuel.since for the same radius cylinders have more volume than spheres.

Easy to manufacture the cylindrical vessels

Ease in transportation

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High pressure cylinders are manufactured by using seamless tubes and hence cylindrical shape is  easy to manufacture by hot spinning.  This might be one of the reasons.

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The most efficient shape for withstanding high pressure is a sphere but that would be costly to manufacture. A cylinder with a domed top and a domed bottom (look underneath, the flat base is actually welded around the outside, the bottom of the gas container is actually domed) is a much cheaper shape to manufacture whilst still having good strength to resist the internal gas pressure.

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u all are partially corret but thing beyond ....think practically the reason is safety as in case of accident if the upper supply valve of cylinder breaks than the pressure or thrust exerted is in horizontal direction only in y - plane only which is observed by earth(ground) and cylinder does not move any where in standing position where as if u use sperical shape to store they moves in random direction and the pressure or thrust is enoungh high to produce huge casualties. any more question mail me on brovin.brovin@gmail.com

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The force acting on the area of the cylinder end is the same whether it is a flat surface or cylindrical, but there is more material surface area if the end is cylindrical and so tne material can be thinner as there is less stress per square inch 

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Several of the previous comments speak of "stress concentration" avoidance as the reason for the use of the cylindrical form. This is a misunderstanding of the term "stress concentration."

A stress concentration occurs when there is a sharp change in section area such as a hole, a notch, or a reenternant corner. This would not be the case with a pressure vessel with flat sides such as a rectangular box.

If a flat sided vessel is used, the problem that dominates is the bending stresses at the edges of the flat plate. These are required to sustain the required angle at the corner, and they can often be severe.

DrD

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gas cylinders are used b/c gas required seamless so it difficult to make seamless in rectangular, square for the sake of that cylindrical shape is easy for caulking process i think so 

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The most efficient shape for withstanding high pressure is a sphere but that would be costly to manufacture. A cylinder with a domed top and a domed bottom (look underneath, the flat base is actually welded around the outside, the bottom of the gas container is actually domed) is a much cheaper shape to manufacture whilst still having good strength to resist the internal gas pressure

 

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Usually we produce a container, all want to use the most provincial materials, to install a certain volume of liquid, or, with the same material, to make the largest container volume.
Like gasoline barrels, thermos, etc., are filled with liquid containers. Usually, you have not noticed, the container of liquid, often are cylindrical
. We learned in plane geometry how to calculate the area of a circle and the area or perimeter of some regular polygons. For example, a square with an area of 100 square centimeters has a circumference of 40 centimeters, an equilateral triangle with the same area has an equilateral circumference of about 45.6 centimeters, and a circle with the same area has a circumference of only 35.4 centimeters. This means that when the area is the same, the equilateral triangle has the largest circumference, the smaller the circumference of the square, and the smallest circumference of the circle in the figures such as circles, squares and equilateral triangles. Therefore, the same volume of liquid containers, containers, if the same height, then the side of the material required to cylindrical containers of the most provincial. Therefore, the cylinders filled with liquids, such as petrol drums, are mostly cylindrical.
Is there any more material-saving shape than a cylinder? some. According to the mathematical principle, in some containers made of the same material, the volume of a spherical container is larger than that of a cylinder, that is to say, a spherical container can save more material. However, the spherical container is very easy to roll, unstable, and its lid is not easy to make, so impractical.
Put solid containers, such as boxes, boxes, cabinets, etc., why not make a cylindrical it? Although cylindrical containers are more economical, it is not economical to load solid objects, so they are often cuboid.

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cylinders are used to avoid stress concentration and distribution of kinetic power of gas molecule exerting pressure at a time period and easy exit of gas material without residue.thats my idea

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Due to the lesser value of forces, lesser stresses are developed in the cylinder and it is much stronger. Theshape of the cylinder also plays an important role. The pressure is distributed evenly and there is no concentration of force. Hence, there is no weak or break down point in the body

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To lower the stress concentration at the very sharo edges of the various shape like sqr. trin.rec. or any various shape. The Best shape is to utilized spherical shape but it is not possible . In refineries the very big spherical containers are there for used of storage , but for distribution purpose the cylindrical shape is the very much suitable shape.

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