Calculation of the pipe wall thickness for strength

initial data Liquid Water Estimatedwall temperature +5оС material: AISI 304 Subsea pipeline An increase to the wall thickness Operating gain pipe outer diameter of 133 mm or more C21 =3 mm. The estimated thickness of the pipe wall tc = p0Da/(2σφ) +c1+c2= 0,913·133/(2·173.73·1)+0.45=0,8 mm where
p0 – design pressure in the conduit, MPa,
p0 = (pi – pg min) + Δ p=1,0-0,087=0,913 MPa,