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  1. NATIVES

    Removal of 3 Layer Polyethylene on pipeline under water

    What is the ramification of removing 3 Layer Polyethylene on pipeline under water (offshore) to accommodate AUT inspection? Is it a common practice? Must the coating be removed to perform AUT inspection?
  2. NATIVES

    ASME B31.8 TABLE 841.1.18-1 Temperature Derating Factor

    ASME B31.8 TABLE 841.1.18-1 has temperature derating factor for temperatures ranging from 250F to 450F with 50F increment. GENERAL NOTE below the table says : For intermediate temperatures, interpolate for derating factor. I noticed a graph of Temperature vs derating factor make a straight...
  3. NATIVES

    Finite Element Analysis to compute MAOP of corroded pipeline

    EdStainless/ MarriolaV: Code is Barlows: 30 cfr 250.1002 Corrosion is non-uniform metengr: i will check with ASME FFS-1 brimmer: ABAQUS/Standard version 6.14.1
  4. NATIVES

    Finite Element Analysis to compute MAOP of corroded pipeline

    A pipeline has lost approx 50% of all thickness. Original wall thickness was 0.625-inch. Barlow's or B31G gives MAOP much lower than desired MAOP. [Desire MAOP 5,000 psi, computed MAOP based upon Barlow's 3200 psi]. Company hired a high flying engineering consulting company with top brain to...
  5. NATIVES

    CP Design for sub sea pipeline with bare welded joints

    Client does not want to coat welded joints (12-inch width) , but wishes to add extra anode weight and/or reduce spacing based upon higher coating breakdown factor. Is it acceptable practice. I like to know your thoughts. Which coating breakdown factor should be followed? DNV or ISO?
  6. NATIVES

    Derating MAOP of a corroded subsea pipeline or offshore platform pipes

    Thanks for the response!
  7. NATIVES

    Derating subsea pipeline (pipelines on offshore structures) using B31G

    Thanks both for your response! I will post this question in Corrosion engineering also.
  8. NATIVES

    Derating MAOP of a corroded subsea pipeline or offshore platform pipes

    Can anyone please state your experience to derate MAOP of a corroded pipeline using ASME 31G? Is the result obtained by using B31G reliable? Any good or bad experience? What is the difference bwteen B31G, B31G modified, and RSTRNG method? Any advantage o using one method over the other one? How...
  9. NATIVES

    Derating subsea pipeline (pipelines on offshore structures) using B31G

    Can anyone please state your experience to derate MAOP of a corroded pipeline using ASME 31G? Is the result obtained by using B31G reliable? Any good or bad experience? What is the difference bwteen B31G, B31G modified, and RSTRNG method? Any advantage o using one method over the other one...
  10. NATIVES

    Specific Gravity of Subsea pipeline

    What should be minimum specific gravity of a subsea pipeline so it won't float in water? I know it has to be higher than 1, but is there any recommended number by API, ASME, DNV, or by any Standard Specification? Any reference will be greatly appreciated.
  11. NATIVES

    Minimum pipeline wall thickness

    When a pipe is corroded or dented, frequently a clamp (PLIDCO clamp appears to be popular) is placed around pin hole leak or pipe Thermo warp is placed around the damaged section. Is there any guideline for what should be the minimum wall thickness (after corrosion pr dent) which is considered...
  12. NATIVES

    Can Pipeline Inline Inspection replace hydrotest?

    i have a company wishing to perform Pipeline Inline Inspection (ILI) utilizing Mechanical Feeler Defect Sensing (MFDS) to replace hydrotest requirement. Is inline inspection to detect defects as good as hydrotest?
  13. NATIVES

    Hydrotesting 100 foot long offshore pipeline at onshore shop

    Big Inch: First all, I have not forgotten K-12 physics. 14.7 psi is too small number to play with in this calculation. So I ignored this number to make things simple. I have a few questions, though. The well is flowing into the pipeline with a pressure of 5000 psi at a water depth of 8000...
  14. NATIVES

    Hydrotesting 100 foot long offshore pipeline at onshore shop

    A 100 foot long pipe is going to be installed at a water depth of 8000 feet. External hydrostatic pressure is 3550 psi. Pipeline MAOP is 5,000 psi and hence hydrotest pressure is 6,250 psi. Pipeline is going to be hydrotested onshore prior to installation. 1. Some of us think pipeline should be...
  15. NATIVES

    HYDROTEST ON SUBSEA PIPELINE

    BIGINCH: Thanks for your response. I guess my question was what should be the test pressure reading on the pressure gauge when the "test pressure" is 10,000 psig? Should not it be 14444 psi since 4444 psi was the starting gauge reading ? Should not 4444 psig be treated as "0" psi for pressure...
  16. NATIVES

    HYDROTEST ON SUBSEA PIPELINE

    Pipeline is sitting at 10,000 feet water depth (approx. 4444 psi hydrostatic pressure). Pipeline needs to be hydrotested subsea. By that means, the testing equipment, pressure gauge, etc will be all located subsea at a water depath of 10000 feet. MAOP of the pipeline is 8000 psi, so the...

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