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Recent content by salmon2

  1. salmon2

    Yield strength vs tensile strength for grade number

    Hi, hope all is well. I am interested to know why the grade number sometime refers to yield strength; but sometime tensile strength. Such as ASTM A516 Gr70, its TS is 70ksi and YS is only min 38ksi. On the other hand, ASTM A572 Gr65 means the min YS is 65ksi. I have to say, from where I have...
  2. salmon2

    safe or minimum distance

    From a offshore installation and maintenance stand points, what is recommended distance between umbilical and flowline/pipeline in subsea production system? Thank you.
  3. salmon2

    Fluid Flow Rate

    Sompe production profile I have seen, say: oil flow rate: 100,000 bopd water flow rate: 50,000 bopd Total fluid flow rate: 140,000 bopd Why the total fluid flow rate is less than the sum of oil and water? Water injection is excluded here. Thanks.
  4. salmon2

    Elastic-plastic (EP) analysis

    TGS4 - I took me a while to check the references and understand. Thank you so much and obviously you are the man for ASME. A huge star for you. Several followingup questions: 1) about true stress and strain curve, I read annex 3.d as that after necking, perfect-plastic shall be assumed, right...
  5. salmon2

    Elastic-plastic (EP) analysis

    Thank you - TGS4. 1) can you please elaborate more on this "Did it collapse (and by collapse, I mean did the finite element analysis solution converge to a statically-permissible solution) prior to the required factored load"? I guess I am still confused with definition of "collapse". Maybe you...
  6. salmon2

    Elastic-plastic (EP) analysis

    All, I understand and am quite familiar with stress linearization and categorization with linear-elastic analysis. Only did couple nonlinear/EP analysises before. I like stress linearization as it allows me to interpret linear FEA results in a reasonable way. I am wondering what is the...
  7. salmon2

    Supplier recommendation needed

    I am looking to talk to some small or medium sized LWD/MWD companies,rather than big ones like Schlumberger or Weatherford. Any recommendation or contact will be appreciated. Prefer TX or LA subsidiaries if possible.
  8. salmon2

    Subsea valves with welding end

    Ok, littleinch, that is another way, thank you again. But the hydro test at pipe mill is usually low pressure, not the maop, I think. My specific case is 15ksi for fat, which is very high to me for a pressed seal method.
  9. salmon2

    Subsea valves with welding end

    Excellent! Littleinch, that has answered my concern perfectly.
  10. salmon2

    Subsea valves with welding end

    I am in process of writing subsea valve Spec with welding ends for manifold fabrication. So there probably are two contractors involved: valve manufacturer and manifold fabricator. Then how should I specify the FAT test in the valve Spec (no blind flange can be used for testing given the welding...
  11. salmon2

    Career path

    I would go with #1, as you mentioned potentially to be company man later. Also, you can switch to directional drilling, that is big $$$ usually. Field engineer for big 3, not too much potential over there.
  12. salmon2

    Perforating Gun Material

    If you use 4130, then don't go beyond P110; otherwise, will be brittle. Why the length of perf gun matters, the dead weight? I think you want higher strength for performance purpose. To get 142ksi yield strength, you have to use other chemistry than 4130, may be 4340, 4330V, 8630, etc. But...
  13. salmon2

    API 6AF2 flange capacities

    I am trying to reproduce or verify the capacity chart in 6AF2, especially by leakage criteria. I verified couple sizes and several load cases for each size. The result I got was lower than 6AF2. Wondering if anyone did the same thing before? The leakage criteria in 6AF2 is: 1) fix the outer...
  14. salmon2

    API 6AF2 flange capacities by FEA

    I am trying to reproduce or verify the capacity chart in 6AF2, especially by leakage criteria. I verified couple sizes and several load cases for each size. The result I got was lower than 6AF2. Wondering if anyone did the same thing before? The leakage criteria in 6AF2 is: 1) fix the outer...
  15. salmon2

    Perforating Gun Material

    Best available material shall be 4130 and I would suggest to get P110 grade rather than 142ksi.
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