Material Handling and Storage

In a deep grain silo, bulk density is $\rho = 800\text{ kg/m}^3$ ($g = 10\text{ m/s}^2$, so $\rho g = 8000\text{ N/m}^3$), hydraulic radius is $R = 1.0\text{ m}$, and coefficient of grain-wall friction is $\mu' = 0.40$. The asymptotic maximum horizontal wall pressure $p_{h,\infty} = \frac{\rho g R}{\mu'} = \frac{8000 \times 1.0}{0.40}$ in kPa is: