Looks like your conductor is made from B grade steel plate which is
welded spirally into a pipe shape. Not sure that this is in compliance with API 5L would recommend that you check with the pipe supplier as to what steel has been used to make this pipe
The specification of B grade steel pipe is that it has a
minimum tensile strength of 50,000 psi (see ASTM Spec for grade B carbon steel).
Pipe has an OD of 30 and an ID of 29.25 so you have a high D/t ratio (large OD with thin wall) That gives you an D/t ratio of 80
Using the API 5C3 calculations50,000 psi yield strength with a D/t ratio of 80 gives you
burst pressure of 1090 psi
collapse pressure of 94 psi
Tensile strength of 1,744,000 lbsVery low collapse is a result of the large OD to wall thickness ratio.