Umbilical

A method for arranging an umbilical between a sea surface offshore construction and a seabed installation, comprising:

• arranging an umbilical between a sea surface offshore construction and a seabed installation at a seabed, the umbilical comprising:
• one or more longitudinal umbilical elements, including one or more of a filler element, a signal cable, a fiber optic, an electrical power cable, or a load carrying element;
• and
• a fluid pipe arranged within the umbilical, the fluid pipe extending a length from a first end of the fluid pipe to a second end of the fluid pipe, the fluid pipe including:
• a first portion including a seamless pipe, wherein the first portion extends a first portion of the length;
• and
• a second portion including a seam-welded pipe, wherein the second portion extends a second portion of the length, wherein the first portion of the length and the second portion of the length do not overlap, wherein the first portion of the fluid pipe is spliced to the second portion of the fluid pipe at a predetermined location along the length of the fluid pipe, and wherein the one or more longitudinal umbilical elements and the fluid pipe are laid in a continuous helix within the umbilical;
• arranging the first portion of the length in a dynamic area of the umbilical positioned between the sea surface offshore construction and the seabed;
• and
• arranging the second portion of the length in a static area on the seabed between the sea surface offshore construction and the seabed installation.