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  1. nietzche

    Galloping response of Piggy back pipeline systems

    DNV-RP-105 suggests that galloping has to be properly taken into account for piggy back solutions, however it doesn't give any clear guideline for doing this. Is a CFD analysis/experimental test the only option? Could anyone advise on how to consider it? Heard it is more of an issue with...
  2. nietzche

    Subsea Pipeline Free Span Detail Fatigue Analysis

    Regarding Question 2 Sec 4.2.3 explains this. The idea is to estimate the damage separately for IL and cross flow induced IL with different frequencies as defined and 4.2.3 and then compare and take the conservative among the two for Inline damage. Eq in 4.2.2 should be read together with the...
  3. nietzche

    RISER - Narrow Band Fatigue Damage Assessment

    Regarding eq A.3, now i feel your interpretation is right. Please refer to Sec 5.2.6 of DNV-RP-F105, 2006 for stress response spectral density. (Note that this is applicable for pipelines and not risers and hence need to be interpreted with care).
  4. nietzche

    RISER - Narrow Band Fatigue Damage Assessment

    Eq A.3 is for a single sea state (one needs to use the wave probability while estimating the cumulative damage for a long term distribution of stress cycles); whereas Eq 2.8, if used for short term fatigue damage in stationary environmental conditions (characterized by unchanging Hs,Tp and...
  5. nietzche

    Riser Wave Induced Vortex Shedding

    My opinion is that we need to consider both wave and current together in the VIV fatigue assessment, and for any particular sea state described by Hs and Tp for waves and current velocity, fatigue damage needs to be computed based on response models (for inline, crossflow and crossflow induced...
  6. nietzche

    Axial Resistance of buried pipeline in Clay backfill

    How do we estimate the axial resistance of a buried pipeline with clay as the backfill material? Thanks in advance
  7. nietzche

    Thermoplastic Liner Design

    Hi, Could anyone advise on the guidelines/criteria for Thermoplastic liner design, wall thickness selection, for a typical thermoplastic liner used for water injection pipeline application. Thanks in advance

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