Everywhere in world shape of LPG cylinder is mostly cylindrical due to the fact that corners are
considered weak points for a holding such high pressure, ( 6 to 8
Cylinder are designed and manufactured by having less weld joint
(again a weak point) and also the pressure inside will be
equally(almost) spread through out the cylinder having no single weak
Another best design can also be obtained by using *spheres* but
construction of sphere is very complicated and not cost effective at
all for such huge quantities. Hence such shape is accepted worldwide.