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Recent content by Knife44

  1. Knife44

    High corrosive fluid service, material selection

    still, "Highly corrosive fluid" is too general of a statement. To break it down to the original question on "How would a piping engineer approach this?". The answer is, really what LI mentioned above. Go talk to a materials or corrosion engineer, or reference the acceptable codes and standards...
  2. Knife44

    Non destructive testing selection for different damage mechanisms

    I do this frequently. You also have to have some experience with ndt techniques and their limitations. Some techniques don't find certain types of damage well so we would use something else, let me know if you have not solved this issue. API510,API570,API653,API577,API571, API580, NBIC AI. A.S...
  3. Knife44

    1985 Allowable Stress Values

    It's 17500 up to 650 degrees. API510,API570,API653,API577,API571, API580, NBIC AI. A.S. Eng, BSME
  4. Knife44

    maximum under tolerance for plate 1/2 inch

    Does anyone read the dang books anymore? API510,API570,API653,API577,API571, API580, NBIC AI. A.S. Eng, BSME
  5. Knife44

    TENSILE TESTING

    Think of it this way. The purpose of a procedure qualification is to prove that your welding procedures essential variables are established and will guide a welder to make sound welds. The purpose of a welder qualification is to prove the welder a ability to deposit sound weld metal. If either...
  6. Knife44

    Corrosion Rate

    Chicopee, I mean no disrespect by this, but I would be careful about throwing out "rules of thumb". People in the power piping and steam/boiler world have made some really bad choices by going off of what someone said instead of referencing the industry accepted standards. Most states accept...
  7. Knife44

    High corrosive fluid service, material selection

    This is everyday stuff in the refining world. Give me the process fluid I'll give you the info from my corrosion books. API510,API570,API653,API577,API571, API580, NBIC AI. A.S. Eng, BSME
  8. Knife44

    PUP PIECES

    Review material grouping p numbers in section 9. 350lf2 is a forging with lower impact temps API510,API570,API653,API577,API571, API580, NBIC AI. A.S. Eng, BSME
  9. Knife44

    High corrosive fluid service, material selection

    For crying out loud. What is the specific fluid ?? Water is corrosive to bare Ayer technically. Salt water is highly corrosive in the right conditions. Corrosion comes down to process fluid and operating variables pressure temp velocity etc. api 571 covers damage mechanisms and Nace provides...
  10. Knife44

    O2 Pressurized Container, Device

    FYI. Low pressure Gaseous Oxygen is very combustible. It will react with and burn any petroleum based products including rubber, oils, thread sealant etc. You can literally have a fire inside the part and not know it until it starts changing colors. Carbon steel above 15psi is combustible in...
  11. Knife44

    Difference between ASTM A/B and ASME SA/SB Materials

    metengr nailed it. ASTM produces new material specifications. When the ASME Committee for materials accepts a new material for use in PV construction, they add it to the registry designated SA. They also strike old materials from registry such as SA7 SA212 etc...
  12. Knife44

    Corrosion Rate

    Why would you need to perform a FFS? If the vessel still has enough useable corrosion allowance, then operate it until you reach the minimum thickness. Fitness for service assessment is for after you have reached T-min or if you have single or isolated corrosion issues. You are literally...
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