No$.110,$ please modify as follows:

Determine the allowable internal pipe pressure by comparing the tangential normal stress to $80\%$ of the material's tensile yield strength. Please note that the tangential stress is typically the greatest of the $3$ principle normal stresses $($namely tangential$,$ longitudinal, and radial$).$ The material is AISI $1040$ Cold Drawn steel, and you may find the mechanical properties in your Shigley text's appendix. Once you have determined the allowable internal pipe pressure, find the values of the tangential$,$ longitudinal and radial stresses in this thick wall pipe.