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RE: Why are tankers that haul liquid cylindrical? Can't it be, say, rectangular?
Well, i think i should add this.
To make a rectangular shape, the tanker would need to be joined (welded) in 12 (or more) distinct places but in the case of a circular one, just 3 places is possible. Thus, lesser work is done in production and lesser weak points.
The more the number of joints, the greater the weak point of a device.