Norms and attitude towards them
In world practice, it is generally accepted that the roar inertial for sifting bulk materials works satisfactorily if the amount of impurities of other fractions in the material obtained is 10% or less. In practice, they often allow an error up to 15-17%, due to unwillingness to bear unnecessary costs for frequent repair of worn equipment. This is allowed by construction standards, but the problem is that the actually used equipment has completely different characteristics.
