“…Pipelines may have internal corrosion protection layers (Vedeld et al, 2012a(Vedeld et al, , 2012b, external weight coatings (Ness and Verley, 1996), thermal insulation coatings (Choqueuse et al, 2002;Guan et al, 2005; or combinations thereof. Hence, the total structural mass includes the weight of the steel wall plus all other layers, and the added mass must be calculated based on the outer hydrodynamic diameter of the pipe.…”