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  1. akvtech

    Pressure Vessel Fabricator

    As the fabricator of a vessel(Drum).We finished it and the data report is signed by our AI...now comes the engineer wanting to add an attachment clip. Its still in our shop. Is this a routine repair that requires an R stamp? Secondly, Is it reasonable to wave the re-hydro after welding on the...
  2. akvtech

    Pressure Vessel 2-1/4 Cr 1 Mo Clad w/ 321ss welding issues

    Thanks Duwe6...they have to use gas manifolds when using SAW on large vessels. My guess is they don't want the headache of strict pre-heat controls
  3. akvtech

    Pressure Vessel 2-1/4 Cr 1 Mo Clad w/ 321ss welding issues

    A vendor declined to bid on 2-1/4 Cr vessel because they say they've had too many cracking issues in the past. Does anyone have experience with this material 1" to 3" thick? Issues such as weldability, cracking, HIC, delayed HIC, Pre-heat sensitivity, PWHT issues etc... If so what...
  4. akvtech

    PWHT Mutiple Times on Chrome P11 and P22

    To clarify; by weld-in I meant they are cutting a hole in the pipe and welding SS thermowells straight into the P11 & P22 pipe.
  5. akvtech

    PWHT Mutiple Times on Chrome P11 and P22

    Thanks Metengr. I just want to be sure footed and not create a worse problem by over working the metal. BTW We are at a crossroads with these thermowells and need to decide to either continue with the weld-in type or switch to flanged type we have had some cracks in the welds in the Hydrogen...
  6. akvtech

    PWHT Mutiple Times on Chrome P11 and P22

    Appreciate the response Mike. These spools are installed and not likely going to be disected for destructive testing. That being said...if the historical evidence of this situation indicate failure of "Some Kind" is likely, then replacement of all the spools affected may be in order. Due to...
  7. akvtech

    PWHT Mutiple Times on Chrome P11 and P22

    Are you refering to Replications on the actual parts or some other metalurgical testing?
  8. akvtech

    PWHT Mutiple Times on Chrome P11 and P22

    The vendor is fabricating P11 and P22 piping. Spools are placed in an oven for PWHT so the whole part. Afterwards they installed weld-in type thermowells so a second local PWHT was done. Now I find the welds on the thermowells in this B-31.3 piping were installed as a fillet welds and not full...
  9. akvtech

    DMW

    Yes DMW is Dissimilar Metal Welding. GTAW and SMAW Like Metengr said technique is likely as much the culprit as anything. Does anyone know when the temp limitations on DMW with 309 came about?
  10. akvtech

    DMW

    Other threads have approached the subject and in my case a client used 309 filler metal to weld about 25 different 316ss Thermowells in crude and reformer sections of their refinery. Some lines are CS and others are 1-1/4cr and 2-1/4cr. They have lots of cracking issues after startup and first...
  11. akvtech

    Hardness after PWHT

    Brimstoner...Vickers or other hardness tests are ok as results can convert to BHN. I choose to sample a cross section of base metal away from the haz, in the haz and of the weld. Its a preference thing that gives me an snap shot of the entire cross section. And taken on the side that is in the...
  12. akvtech

    Hardness after PWHT

    Thanks to all for your replies...I am affecting the change in our standard so it will be part of future RFQ and POs.
  13. akvtech

    Hardness after PWHT

    Do you think it reasonable to ask the vendor to prove up the PWHT effectiveness with brinells (I prefer from the process side) on these 2-1/2" to 3-1/2" thk reactor vesels (SA-387-11 CL2) Otherwise all I have is a chart.
  14. akvtech

    Hardness after PWHT

    Where can I find the requirements for hardness testing of vessels after PWHT and/or the maximum hardness values of various metals typical to pressure vessel fabrication (P4, P5 etc..)
  15. akvtech

    RT after Stress in P4 Vessel

    Thanks for the input guys...I'm good to go
  16. akvtech

    RT after Stress in P4 Vessel

    can someone tell me where in Sect VIII RT is required after stress for P4 material (Vessel over 1.25" thk)
  17. akvtech

    Compressed Gas Cylinder Fabrication

    Petrochemical industry
  18. akvtech

    Compressed Gas Cylinder Fabrication

    Thanks...but I'm looking for standards that govern the fabrication of custom sized compressed gas cylinders not so much to purchase them
  19. akvtech

    Compressed Gas Cylinder Fabrication

    Can someone tell me the aplicable code for fabricating compressed gas cylinders, with internal coating. >6" and up to 40' long
  20. akvtech

    PWHT Exemptions on A335 P9 attachment welds

    Appreciate the feedback, however I am loosing on this one because our engineering dept agrees with the vendor that the exception is allowed...in part based on the attachment being P8 material and welded with 309. I still don't get that warm fuzzy because the code isn't specific enough in the...

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