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  1. Vikoll

    Deviation from ASME B31.3 Hydrotest Requirements

    Thank you, LittleInch, with your reference to the Code, I think we are getting closer to the answer. Actually, in my mind, the initial question was not of a technical matter, but rather about order of precedence, division of authorities and what governing body or document shall prevail. I quite...
  2. Vikoll

    Deviation from ASME B31.3 Hydrotest Requirements

    My bad, Gents, if I have missed important information. I sincerely thought, if I say that HDPE headers convey "ground water from water wells to the pond" that will provide some indication of fluid temperature. I did not want to make my post over-complicated with many numbers. Also, it is...
  3. Vikoll

    Deviation from ASME B31.3 Hydrotest Requirements

    TGS4, I truly appreciate your concern, but water at 20°C is not an expansible fluid, and as such, does not require registration with ABSA. Going back to initial question and putting all other matters aside: if anyone else can provide the expert opinion on whether owner can deviate from B31.3...
  4. Vikoll

    Deviation from ASME B31.3 Hydrotest Requirements

    TGS4, I believe these lines do not fall under any of listed jurisdictions Thanks, Vikoll
  5. Vikoll

    Deviation from ASME B31.3 Hydrotest Requirements

    LittleInch, As I mentioned, the design pressure is above 150psi, but only because pumps can create that high dead head pressure if someone closes valve without shutting down pumps. Normal operating pressure is just about 100psi that makes this service category D under normal operating...
  6. Vikoll

    Deviation from ASME B31.3 Hydrotest Requirements

    Dear Colleagues, Could you please provide your expert opinion of whether deviations from the ASME Codes, particularly from hydrotest requirements in B31.3, are allowed at owner’s discretion? My understanding always was that companies can deviate only from their own Standards and Specifications...
  7. Vikoll

    System Design Factor f2 For SUS, OPE and HYDRO Cases in UKOOA

    What system design factor f2 should be used for SUS, OPE and HYDRO cases in analysis of buried FRP pipeline as per UKOOA? I remember previously it was recommendation to run 3 separate cases with values as per attachment (0.67 for SUS, 0.83 for OPE and 0.89 for HYDRO) Now I cannot find same in...
  8. Vikoll

    Design of High Pressure Steam Line on pipe rack

    Thank you all for such great exchange of opinions. This line was designed and DWG singed and sealed by PE who took personal professional responsibility for it. Second PE who was involved agree that even design is not perfect, it still does not require modification. The dilemma now is that in my...
  9. Vikoll

    Design of High Pressure Steam Line on pipe rack

    Thank you, DSB123, for your opinion. The question remains: does this absolutely need to be fixed considering the fact that line is installed and modification will cause start-up delay not to mention huge cost? Additional info to consider: straight runs without line stops between loops in one...
  10. Vikoll

    Design of High Pressure Steam Line on pipe rack

    Dear Colleagues, in a course of review of stress analysis in oil treatment plant I came across of NPS 24” Sch.100 high pressure steam line at 320 deg.C and 11000 kPag. Line is on a pipe rack about 220m long and has 7 expansion loops. The issue is that there are only 4 line stops. Two pairs of...
  11. Vikoll

    Acceptable External Nozzle Loads calculation for Pressure Vessels and Tanks

    Let me thank all participants for provided guidance and opinions. I downloaded a copy Norsok R-001 but still have a spread +/- 100% for loads recommended by various company standards. My personal opinion Norsok R-001 allowable loads are very conservative and may be difficult to comply with by...
  12. Vikoll

    Acceptable External Nozzle Loads calculation for Pressure Vessels and Tanks

    Let me thank every responder for provided expertise. In an engineering field one can learn even from different opinions if a good engineering judgement is applied. At the same time I would ask again a question about acceptable “benchmark” allowable nozzle loads for PV, heat exchangers and...
  13. Vikoll

    Acceptable External Nozzle Loads calculation for Pressure Vessels and Tanks

    I am a piping stress engineer currently developing a company procedure Acceptable Nozzle Loads for Process Equipment. We need this procedure because in the past we have seen equipment such as tanks and vessels supplied without any allowable external nozzle loads, with unreasonably low allowable...
  14. Vikoll

    Variable vs. Constant Springs and PTFE Low Friction Plates Application

    Dear Colleagues Please kindly share your expert opinion on application of Variable vs. Constant Springs and low friction TSP (PTFE) plates in combination with springs: 1. What variability/vertical travel of variable spring support is generally acceptable in front of static equipment (tanks...
  15. Vikoll

    Stress Analysis of Offshore Oil Platform Piping Restrained by U-Bolts

    Thank you All for sharing you valuable expertise. Now I have more confidence to proceed the right way. Vikoll
  16. Vikoll

    Stress Analysis of Offshore Oil Platform Piping Restrained by U-Bolts

    Dear colleagues: Thank you very much for your valuable responses. I totally agree with above expressed opinions. My only concern is that “Telling Truth...” will be just my word against their word. It is my understanding, that being an engineer and before advising someone to stop construction and...
  17. Vikoll

    Stress Analysis of Offshore Oil Platform Piping Restrained by U-Bolts

    BigInch: This is one of my primary concerns. Being “tight” during start-up, when pipe is already hot and moved from installed position, U-bolts can still be at lower temperature thus may become “over tighten”, overstressed and eventually fail due to considerably large shear force. What would...
  18. Vikoll

    Stress Analysis of Offshore Oil Platform Piping Restrained by U-Bolts

    Pennpiper: Thank you for your questions. You are right: 1) I am a third party consultant doing selective quality control (piping flexibility and stress) for a client 2) I am looking at pipe sizes from 3” to 16” and all of them, even insulated (???), are restrained by tight U-bolts Please...
  19. Vikoll

    Stress Analysis of Offshore Oil Platform Piping Restrained by U-Bolts

    Thank you DSB123 for your valuable feedback. I totally agree with your opinion. Although almost every engineering company have their own design and pipe support standard, let me ask you what type of support have to be preferably used in offshore oil operations to allow to control thermal growth...
  20. Vikoll

    Stress Analysis of Offshore Oil Platform Piping Restrained by U-Bolts

    Dear Pipers I am performing flexibility analysis of piping on offshore oil platforms designed by European company for Asian market. Installation T=+30 deg.C, Design T varies from -40 deg.C to +120 deg.C for different lines. Design group uses tight U-Bolts (without lugs) with spacing every 3-8...

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