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Recent content by GD2

  1. GD2

    Pump discharge supports

    Have you done a Seismic Analysis for piping before? If not, it could be the tough part.
  2. GD2

    How to determine valve Trim material/ numbers (other than googling it)

    API 600, 602 provide some direction on Trim/CNs.
  3. GD2

    Flange Joint Live Tightening

    Appendix S gives an open and general statement. It is not clear under what conditions the bolts should be re-tightened - reduce pressure by 50%, 25% or re-tighten at the 100% operating condition?? Yes, it's a practice most Owners does. More than blindly following Appendix S, I would suggest...
  4. GD2

    Flange Joint Live Tightening

    There is no rule in any Code or RP that recommends bolt tightening in operating condition. All is done in atmospheric condition. If the Owner still wants to perform at the operating condition, they should better do a "Risk Analysis", and get it approved by the Management. There are many Owners...
  5. GD2

    Technical Opinion on SS304 Potable Water Line Leakage

    OP, You got two problems here: 1. Welding of SS, if proper precautions and Welding Procedure not maintained. 2. Chlorine environment that gives rise to ClSCC. Chlorine might even come from the hydrotest if it was not checked/controlled. Did you say it has cracked longitudinally? It can do so...
  6. GD2

    hydraulic grade line

    It essentially shows the water surface elevation. It's open to atmosphere, hence there will be no pressure head. The bold line HGL is surely for the conduit flow, i.e through the pipeline.
  7. GD2

    Pumps with VFDs

    IMHO, best you call the KSB vendor to give you a presentation and take a training with a Third Party training provider. From your question, I feel, you will mess up this project if you are a novice and without a knowledgeable Supervisor. There is too much to learn and know about pump before you...
  8. GD2

    ASME B31.3 302.2.4 Temperature Variation and piping flexibility

    Typically, Power Outage is considered in a PHA during the design stage. Can you provide what is the current (designed) design condition and the new operating conditions?
  9. GD2

    Closed Loop Piping-Vacuum Issue

    OP, Looks like the schematic is not complete. I am wondering where is the purge valve and how it will be controlled/commanded? As Doug has pointed out there will be air in the system from various sources ( I would add leak to it) and you must have a design in place to automatically test the...
  10. GD2

    Tie-In Issue: 10”x10S SS316L to 24”x10S SS316L – Weld Clearance & Flange Type

    Concept 02 looks fine to me. Although there is no explicit statement on distance between weld joints by any Code, it is generally be recommended to follow the 4x rule, i.e The minimum distance between welds should be at least four times the thickness of the thinner part joined, but not less than...
  11. GD2

    Practical Implications of Impact Testing

    I don't think you got it right. When you order materials, you should ask for impact test, if the material is not impact tested by default.
  12. GD2

    Practical Implications of Impact Testing

    I don't think it is mandatory to have killed steel for low temp service, but preferred as killed steel improves the toughness.
  13. GD2

    Practical Implications of Impact Testing

    Why historical? You know with modern steel mills, steel manufacturing process have changed, and also it's quality. You need to make sure that you test the material you are going to install. It goes by Heat No. You might get away without impact testing, if you follow the rules of Para 323.2.2. It...
  14. GD2

    Deflection of plastic pipe

    You need to evaluate what implication it will have by the process fluid on the piping. Where isolation and draining/ventings are required for maintenance and repair work, will it be safe to work? Think about a toxic material the piping is carrying. You may also encounter issues with gravity flow...
  15. GD2

    Practical Implications of Impact Testing

    Ok. Let me try my best to explain this. Doing an impact test doesn't change the material property, rather it provides the confidence that the material will have enough toughness at the tested temperature (typically this will be the Test MDMT). This is built on the premise that some CS and low...
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