Compact in size.

Saving in Steel/Reduction in weight of transformer tanks.

Saving in oil. Additional reduction in oil volume because of more stability in corrugation  (no bulging of corrugation).

Saving Freight cost.

Improve heat dissipation.

Oil cleaning easier and less expensive.

Due to vertical oil channel greater stability is achieved in comparison with the old system. It means tanks can withstand a higher degree of pressure than before.