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  1. DekDee

    ASME section 9 PQR's

    Yes
  2. DekDee

    NDT performed after or before Hydrotest test

    Please advise which API standards mandate NDT after hydro ?
  3. DekDee

    ASME section 9 PQR's

    Refer Table QW-451.1 Tensile & Bends
  4. DekDee

    is PWHT the "fabrication heat treatment" ?

    YuJie - I am not an engineer. Nor am I greatly experienced with pressure vessels - I am heavily involved with piping. I was just giving suggestions as to your question of what is "fabrication heat treatment" ?
  5. DekDee

    is PWHT the "fabrication heat treatment" ?

    Cold formed heads may be stress relieved separately to the vessel (prior to installation) if the completed vessel does not require PWHT. Would this then be classed as fabrication heat treatment ?
  6. DekDee

    WPS experation date

    A PQR never expires. If WPS requirements are superceded by a new edition you rewrite your WPS. If testing requirements are changed and become additional you perform those tests and add to your PQR.
  7. DekDee

    is PWHT the "fabrication heat treatment" ?

    Hot forming during fabrication at temperatures exceeding 900 F (480 C) will require mechanical testing. ???
  8. DekDee

    NDT performed after or before Hydrotest test

    Maybe this was a little bit harsh. - Another Client without a clue. :) As the Client is paying they can basically ask for anything they like that is additional to code requirements. I just try to point out to the Client the actual code requirements may be totally different to a 30 year old...
  9. DekDee

    NDT performed after or before Hydrotest test

    Hi Christine, Another Client without a clue. :) I had similar requirements on my last project with specifications that were about 30 years old from a major US O&G company. Did not take long to get the requirements waived with a bit of information provided. Just out of personal interest - how...
  10. DekDee

    NDT performed after or before Hydrotest test

    I have blocked him - the forum is much more enjoyable for me now.
  11. DekDee

    Minimum PWHT cycles for piping

    Hi Hub, Where is this requirement noted in Para 331 ? My response to the OP was going to be two cycles is a Client requirement to cover initial PWHT and a possible second cycle if a repair is performed.
  12. DekDee

    NDT performed after or before Hydrotest test

    IdanPV has given you two examples. Here is B31.3 345.1 Required Leak Test Prior to initial operation, and after completion of the examinations required by para. 341, each piping system shall be tested to ensure tightness. The test shall be a hydrostatic leak test in accordance with para. 345.4...
  13. DekDee

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

    LI has probably nailed it. Here is my suggestion - not an engineer so please do not shoot me down. One flanged joint only - extend the pipe connected to the Exchanger. Install the 10" (or 8") stub on the extended Exchanger pipe
  14. DekDee

    Welding of duplex SS pipe 30 "

    " and there is no fully equipped welding shop..." - not a good way to start !!!
  15. DekDee

    Tangential Radiography of 16" pipe

    Thank you for the response Steve - learn something new every day. Cheers
  16. DekDee

    Tangential Radiography of 16" pipe

    We did this many years ago. Took a sample ( exact thickness and diameter) boiler tube and machined multiple slots at increasing depths on the internal surface. Radiographed that tube as a reference graph. After radiography of suspect tubes the density of any internal corrosion was compared with...
  17. DekDee

    Tangential Radiography of 16" pipe

    Steve - where does the 115 mm penetrated thickness come from ? OP has stated WT as 9-12 mm so penetrated thickness would be 18-24 mm (DWSI) ??? Or am I missing something here ?
  18. DekDee

    Question of scope of ASME BPVC SECTION IX

    FOREWORD The Committee does not rule on whether a component shall or shall not be constructed to the provisions of the Code. The scope of each Section has been established to identify the components and parameters considered by the Committee in formulating the Code rules. Which section are you...
  19. DekDee

    ASME SEC.IX WPS filler designation

    Have a look at QW 404. You must list all essential and non-essential variables on the WPS. QW 404.12 is the only one that concerns you.
  20. DekDee

    ASME SEC.IX WPS filler designation

    Without even going into the technical side of it ask yourself - " Why do we have WPS's" ? To provide guidelines for the welders. Does the welder carry a copy of ASME IX in their back pocket ? - No. How does the welder know if an alternative filler is acceptable if it is not noted ?

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