The section on Moorings in Chakrabati's Handbook of Offshore Engineering Vol2 can help with general overview. Also, try to see API PR 2SK on Stationkeeping of Floating Structures.
Codes are silent on this issue. However, as a designer you should design putting weldability into consideration. I used to consider (2*D) for line 4inches and below for bigger lines I use the (1*D).
It depends on what you mean, if you are speaking of defining a spectrum to represent the sea state then you are right there are some spectrum that are one parameter spectrum e.g. ITTC and ISSC.
However, from the understanding of significant wave height which is often assumed to be equal to...
It’s in order to capture all possible extremities of the sea state. Generally 3hrs is statistically sufficient to achieve this, using more than this is waste of project time frame.
However for some analysis (e.g. Fatigue analysis), if you can prove that a time duration less than 3hrs will give...
