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Recent content by pipeline058

  1. pipeline058

    DnV RP-E305 Soil data

    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...
  2. pipeline058

    Shore approach trenching/backfilling

    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...
  3. pipeline058

    Seabed Soil Stiffness in Elastic Region

    No, Actually it is just in elastic region. the real resistance comprises of this element plus much more passive resistance due to pipe penetration in soil.
  4. pipeline058

    Cable On-Bottom Stability

    BigInch, I think 1/2 wavelength is correct. but it will be applied to both pipeline and cable or any other structure. I mean no matter the case is pipe or cable, the method seems to be the same. in addition, my case is in shallow water (less than 50m). Interesting is that there are some other...
  5. pipeline058

    Cable On-Bottom Stability

    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...
  6. pipeline058

    Pipelay Barge Stinger

    So, BigInch...they named you as MASTER OF TIPS truely! Again I do agree with you that the problem is already solved. but in my case, the nominate laybarge are not equipped with articulated stinger. with articulated stinger, you have actually two options for stinger length...but what if the...
  7. pipeline058

    Pipelay Barge Stinger

    Yes Atedionyahoo, The tensioner is the best and first option... but my question was pointing another problem if you are going to start from shore approach, and the stinger is set up for laying in 100m water depth, then the stinger tip will be somewhere 15m under water. so, you should continue...
  8. pipeline058

    Pipelay Barge Stinger

    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...
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