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Recent content by weldstan

  1. weldstan

    Minimum PWHT cycles for piping

    Agree with DekDee. This was always the case in my 40+ years involvement with B31.3 piping.
  2. weldstan

    Cathodic protection bare stainless steel 316

    The information was in-house only and never released to the public.
  3. weldstan

    is PWHT the "fabrication heat treatment" ?

    Agree with Ed, if you PWHT above 900F, you need to have the material tests performed to reflect the PWHT.
  4. weldstan

    Bend Test for Aluminum Bronze

    I've never hada problem bend testing wrought AL-bronze ASME IX weld procedure qualifictions. I've never had to test cast Al-bronze for PQR testing.
  5. weldstan

    Mechanical properties in heavy thick test coupons.....

    Can you not take multiple smaller test samples through surface. Not so many labs have tensile testers that are able to perform testing on such a full size specimen.
  6. weldstan

    Cathodic protection bare stainless steel 316

    Prior to my employment with a gas utility, 316 was specified for bare riser piping but had a 4" long PE sleeve at one section of the riser. Leakage was found in locations where high chloride content water was used. Crevise corrosion primarily under the sleeve and at locations where stones were...
  7. weldstan

    NDT performed after or before Hydrotest test

    We have had clients who specified additional NDT after hydrotest - not the same as required by Code prior to hydrotest. These requirements were only required for heavy wall PVs like hydrocrackers.
  8. weldstan

    Regarding requalification of procedure qualification required or not for when welding FCAW filler wire brand name change

    Not required per ASME IX, but may be by Buyer (Customer) specs.
  9. weldstan

    Welder Qualification

    The welder is qualified within the limits of the PQR but may not to the full limits of the WPS: e.g., position.
  10. weldstan

    10 years' experience mech designer. What is next?

    Get your degreee aand then search again in the Middle East, oil producing countries and include Turkey in your seach nations.
  11. weldstan

    Effect of microstructure on crevice corrosion for SDSS

    Directionality of microstructure may have something to do with it.
  12. weldstan

    PWHT MULTIPLE TIMES ON THE SAME JOINT OF SA335P91 MATERIAL

    There have been a number of reports/studies published by EPRI on this subject. I believe they are still free. There has been much research published with regard to P91 and its manufacture and heat treatment and welding thereof.
  13. weldstan

    PWHT MULTIPLE TIMES ON THE SAME JOINT OF SA335P91 MATERIAL

    I limited it to 2 and then required a full cut out and reweld. Excessive surface decarburization was the main reason plus over tempering. In one instance I required pipe spools to be cut out and reheat treated in vacuum furnaces after evaluating microstructure.
  14. weldstan

    PREHEAT

    I would require it for backgouging of welds in heavy wall thicknesses prior to making the opposite side weld. The existing weld is under stress even if intermediate stress relief or dehy heat treating has been performed.
  15. weldstan

    CVN test at Weld Metal with ER70S-6

    You are comparing apples to oranges. The manufacturers data is full size all weld metal tests performed to maximize grain refinement. Yours are subsize specmens with weld metal dilution with base material with probable lesser controlled heat inputs.
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