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  • Users: SDRME
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  1. SDRME

    surge pressure calculation necessity

    I am involved in an oil field proccessing project.the pipeline discipline has asked me before to calculate the surge pressure which may be happened during operation to acount it as an alternative design condition to select the appropriate class for pipeline.the pipeline material is GRP.Since the...
  2. SDRME

    Restrains for Nonlinear Spring or Axial / Lateral Friction

    To model subsea pipeline on seabed, I use restrain type +Y with given friction coefficient (Mu) (to model pipe and soil friction) and static soil stiffness (Stif) (to model pipe settlement in the seabed.) Any comment on this type of modeling is welcomed. However, to near the model to reality for...
  3. SDRME

    shell and tube heat exchanger head type selection

    i have designed a shell and tube heat exchanger (AES type).I have choosed the secondary head type of heat exchanger based on a tempeature defference criateria.the source (reference) of this criteria is unknown for me.so i want to know if there is an applicable criteria such this or not?
  4. SDRME

    Hydrotest on flanged vessel

    I have recently designed some vessels with body flanges. In fact, each vessel can be divided into some parts. The question is that “Is it allowed to perform hydrotest on each section separately (using blind flanges) and then assemble the whole system or the whole system shall be tested at once?“
  5. SDRME

    Examination Groups in Div. 2

    According to ASME sec 8 div 2 paragraph 7.4.2.2.b.1, an examination group shall be applied for all welds within a section. Now, with reference to table 7.2 it is seen that some examinations are N/A for some welds (for example circumferential joint on a nozzle with weld type 2 or 3, d>150 & t>16...
  6. SDRME

    APDL: Command to Define Line Number between 2 Keypoints

    APDL: what is the command to define line with individual number between 2 key points. In other words, I know the commend (LSTR,P1,P2) to define line between 2 key points (P1,P2), but in this command I do not have control on the created line number, and hence I need a command which defines a line...
  7. SDRME

    Detail Fatigue AnalysisûSubsea Pipeline Free Span Analysis

    I want to perform free span detail fatigue analysis in line with DNV-RP-F105 (Feb 2006) (all the below sec references are made to F105). I understand that for each wave state (Hs,Tp, Teta) the design life should be calculated for Response Model and Force Model. To apply current scatter for each...
  8. SDRME

    Subsea Pipeline Free Span Survey (As Laid & As Built Surveys)

    DNV-OS-F101, Oct 2007 sec 10 calls for As-Laid survey during pipelaying and As-Built survey after all the works and final test (however before operation phase). During subsea pipeline engineering design, bottom roughness analysis for various phases (i.e. as laid, flooding, hydrotest, opeartion)...

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