The American codes that apply, ASME B13.8 for gas lines, and B31.4 for liquid lines, along with API 1111 will give you a good summary of what is required for pipeline design.
Also I find that when I am training new engineers the book "Pipeline Rules of Thumb" edited by E.W. McAllister is still...
Nothing major, just a technical correction to a vaule given by Tahmasbi. The density used for seawater should be 1025 kg/m3 to 1030 kg/m3, not 1000 kg/m3 which is fresh water.
