“Minimum After Forming” (M.A.F.). This describes the amount by which the head thickness is reduced at the knuckle area, where the largest deformation occurs when forming the head from a flat plate.
A common rule of thumb is that M.A.F. is approximately 15% of the nominal thickness. This is not the same as corrosion allowance or tolerance, so it requires a separate entry.
When performing strength calculations, this value should be added to corrosion allowance and tolerance. However, it should be excluded from weight calculations, which should not take M.A.F. into account.
“Minimum After Forming” (M.A.F.). This describes the amount by which the head thickness is reduced at the knuckle area, where the largest deformation occurs when forming the head from a flat plate.
A common rule of thumb is that M.A.F. is approximately 15% of the nominal thickness. This is not the same as corrosion allowance or tolerance, so it requires a separate entry.
When performing strength calculations, this value should be added to corrosion allowance and tolerance. However, it should be excluded from weight calculations, which should not take M.A.F. into account.