How do we Design for a deep foundations. Given the data: Diameter $14"($wall thickness $0\mathrm{.}375")$ closed$-$end steel pipe piles; pile length$=70\text{'}$; allowable downward load strength $140$k$,$ allowable upward load strength $40$k; The allowable downward stress and upward stress calculates to be $0\mathrm{.}91$ksi and $0\mathrm{.}26$ksi respectively