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Formula of Pressure Calculating

1. Thickness *thickness **5*length/thickness*8 for example:
                          thickness 6mm, length 2.5m
                          Pressure=6*6**5*2.5/6*8=**1.**5 ton
The above formula is suitable for mild steel, if the material is stainless steel, then the formula should be:

2. Thickness*2*thickness*2**5*length/thickness*2*8, that means double strength of stainless steel, for example:
                         stainless steel thickness 6mm, length 2.5m
                         Pressure=6*2*6*2**5*2.5/6*2*8=**3.*5 ton