As per DNV-PR-E305, the soil is divided to "Sand" and "Clay", and for sand, friction factor of 0.7 is advised.
So, what about Silt, or even more mixed conditions like "Silty Sand"?
AGA suggests for decreasing the friction angle with 5 degree if there is "find sand" or silt in the soil exceeding...
It seems DnV do not have any recommended practice for calculation of shore approach trench depth and the thickness and type of backfill.
I found a common value of 1m for covering the pipeline (1m backfilling over top of pipeline).
Does anyone have a good reference for:
What shall be checked...
Guys,
I was involved in a on-bottom stability evaluation of a subsea cable using common recommended approach of DNV-RP-E305.
While I found the cable unstable based on this RP, I realized that some people evaluate Cable stability with a very simple method, ignoring Wave action. this approach...
I know that the rollers on the stinger of a laybarge will be fixed in a determined position before laying.
But is the stinger itself is fixed either?
If the water depth changes a lot along the route (e.g. form shore approach to 100m water depth), do they pull stinger a bit upward/downward...
