The width of the steel core is based on the size of the tank, which uses PVC tubing inner diameter with 580 mm, because the design has been designed to be stackable, so the transformer should be used which has a thick PVC pipe 8.5 + 1.3 25.4 mm to achieve a mechanical force that can be supported due to overlap. In this case it defines the width 490 mm steel axis so that it can be packed into a steel cylinder axis.
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