hi folks,
I have to design a pipe carrying 4000 psi having an circular opening into another pipe covering/surrounding the internal pipe..
i referred Machine Design data book by K. Lingaiah and got this formula for thick cylinders subjected to internal and external pressure..
tangential stress : =F3=E8 =3D a + b/r2
radial stress : =F3r =3D a - b/r2
where,
a =3D ( pi * di^2 - po * do^2) / ( do^2 - di^2)
b =3D { di^2 * do^2( pi - po) }/ { 4r^2( do^2 - di^2)}
pi =3D internal pressure po =3D external pr. di =3D inner dia do =3D external dia. r =3D any radial distance
now, if external and internal pressure are equal.. tangential and radial stress will be equal to -ve pressure value..
is that ok? .. that i can have any inner dia and thickness (if material's permissible yield strength is more than applied pr.)
kindly help me with that..
regards, Pranav