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  1. atedionyahoo

    Allowable Lateral Distance between Pipelaying Barge and Platform

    Thanks for replies, Based on RAO of the moored barge the maximum lateral movement is about 1.5 m.
  2. atedionyahoo

    Fourier Transform

    How should I solve a heat transfer equation in elliptic region by Fourier Transform method?
  3. atedionyahoo

    Allowable Lateral Distance between Pipelaying Barge and Platform

    Thanks for replies, However to justify the MWS and Client, is there any reference to explain on the allowable distance, or it is only based on experience?
  4. atedionyahoo

    Subsea Pipeline Detail Fatigue Analysis - Force Model

    Case: Subsea Pipeline Detail Fatigue Analysis by Force Model (Direct Wave) Ref.: DNV-RP-F105 (Feb 2006), sec. 5.3.2 Question: To calculate the in line stress range (due to drag and inertia loads) I do not know what boundary conditions to be considered? (e.g. pin-pin or fix-fix, or etc)
  5. atedionyahoo

    Spill back control valve for capacity control

    Dear DLITE30 If I Size control valve for 25% of flow which is maximum flow passing controlvalve during operation,how can I ensure that the valve con serve suitable for 100% of compressor capacity during shutdown case? on the other hand, we need to achive to settle out condition after compressor...
  6. atedionyahoo

    Spill back control valve for capacity control

    thank you for your response to the questions .let me to describe the problem more detail. we have 6 stages of compression from 2bara to 240 bara. as you know,any stage have its own air cooler and the recycle btranch is located down stream of air cooler and return the compressed gas before K.O...
  7. atedionyahoo

    capacity control

    Refer to API 618 capacity of reciprocating compressors could be controlled by unloading device, clearance pocket and spillback control valve. If five steps unloading (i.e. 0, 25, 50, 75 and 100% of full flow) are used in combination of spillback control valve, it is kindly requested to inform us...
  8. atedionyahoo

    Spill back control valve for capacity control

    Refer to API 618 capacity of reciprocating compressors could be controlled by unloading device, clearance pocket and spillback control valve. If five steps unloading (i.e. 0, 25, 50, 75 and 100% of full flow) are used in combination of spillback control valve, it is kindly requested to inform us...
  9. atedionyahoo

    Allowable Lateral Distance between Pipelaying Barge and Platform

    Case: Pipelaying by Barge Near an Existing Platform (the barge is anchor handling type) Question: what is allowable lateral distance between pipelaying barge and existing platform? Many thanks in advance.
  10. atedionyahoo

    Subsea Pipeline Free Span Detail Fatigue Analysis

    Thanks for replies. Re Question 1) I know that wave and current effects in fatigue should be considered. My matter is mathematical as I do not know how to calculate dF(Uc) in Sec 4.2.1 or 4.2.2. (F(Uc) is cumulative weibull distribution of current) (d is differential) However, I think...
  11. atedionyahoo

    Subsea Pipeline Free Span Detail Fatigue Analysis

    Ref.: DNV-RP-F105 (Feb 2006) •Question 1 Sec.: 4.2.1 & 4.2.2: Could somebody literally explain the meaning of “integration over the long term distribution for current velocity represented by a Weibull distribution or histogram”. (If possible to provide a simple example, please) •Question 2...
  12. atedionyahoo

    RISER - Narrow Band Fatigue Damage Assessment

    Thanks for reply, In general fatigue is due to two effects, VIV and Direct Wave. VIV effect is named as Response Model and Direct Wave as Force Model (ref. DNV-RP-F105). Stress Spectral Density in F105, Sec. 5.2.6 is for Force Model (i.e. Direct Wave fatigue), and based on your advice I...
  13. atedionyahoo

    Pipeline Load Reduction Due to Trenching

    Ref.: DNV-RP-F109 (Oct 2007), sec 3.4.5 (EQs 3.21 & 3.22) My case: modeling of subsea pipeline in a trench Question: I understand in case distance of pipeline from either trench sides/walls is more than 3D (D is pipe outside diameter) the load reduction due to trenching is not considered. Is...
  14. atedionyahoo

    RISER - Narrow Band Fatigue Damage Assessment

    Thanks, Ref. DNV-RP-F204 You mean that EQ. A.3 is unit time fatigue damage for a sea state and based on wave probability and each sea state duration the cumulative damage fatigue should be calculated. To extend my matter, to use EQ A.3 it is required the coefficients (i.e. m and sigma) are...
  15. atedionyahoo

    How to run a Subroutine

    Again error, Do I need Fortran on my PC to run subroutine?
  16. atedionyahoo

    Lift Force in ABAQUS / AQUA

    ABAQUS/ AQUA: How can i model Lift Force on a pipeline in ABAQUS/AQUA? (NB, i know how to model drag and inertia forces)
  17. atedionyahoo

    Extracting Flow Velocity / Acceleration in Output

    Regarding ABAQUS / AQUA, I am doing static analysis for a subsea pipeline, Question: how can I get flow velocity / acceleration on the pipeline in the output (*.dat)?
  18. atedionyahoo

    How to run a Subroutine

    Thanks for reply, Just as an exercise I wanted to run ABAQUS example (ABAQUS Verification Manual , Sec. 4.1.4, ufricxxx.inp and its subroutine ufricxxx.f as attached) with the following command Abaqus job=ufricxxx user=ufricxxx.f But it gave error command saying “the following files could...
  19. atedionyahoo

    How to run a Subroutine

    To run a T.INP file in ABAQUS/Standard I use the following command: Abaqus job=T datacheck interactive Then Abaqus job=T continue interactive Can somebody advise how to run a INP file which has subroutine FRIC (when I use the above commands it errors)
  20. atedionyahoo

    Riser Wave Induced Vortex Shedding

    Clarification A) With respect to the replies, it sounds there is a little discrepancy on interpretation of DNV-RP-C205 (Apr 2007). Considering guideline as DNV still I interpret the VIV due to current and wave are assessed separately not simultaneously, if it is otherwise (i.e. combined current...

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