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Recent content by QC7

  1. QC7

    Changes to the WPS

    Hi, “Changes may be made in the non-essential variables of a WPS to suit production requirements without requalification provided such changes are documented with respect to the essential, nonessential, and, when required, supplementary essential variables for each process. This may be by...
  2. QC7

    structural attachment by welding after the hydro test on pipeline

    Hi 1503-44, I also do not agree with any welding on the outer surface of the hydro tested system. However, if the fabrication team wants to add non-pressure components (saddle support, xxxx, etc.) to the hydro tested system by welding due to incorrect production fabrication planning, then I...
  3. QC7

    structural attachment by welding after the hydro test on pipeline

    Hi 1503-44 , Noted your comments. But my query is here, after adding the non-pressure component weld to the outer periphery of the hydrotested system, it is not indicated that the system is to be retested under this code B31.4. Similar like UG99 of Section VIII of the ASME, B31.4 is not...
  4. QC7

    structural attachment by welding after the hydro test on pipeline

    Hi LittleInch, I agreed clause 437.1.4 (a) & 2 and there is no doubt that all pressure welds belong to systems that are subjected to hydro-static after construction. But my question here, after adding the non-pressure component weld to the outer periphery of the hydrotested system, it is not...
  5. QC7

    structural attachment by welding after the hydro test on pipeline

    Hello gentlemen, Are we permitted to attach some clips or structural attachment by welding after the hydro-static or leak test on the pipeline in accordance with code B 31.4 I cannot find anything in B 31.4 that definitively states that a re-hydrotest must be performed after the addition of...
  6. QC7

    Dissimilar thickness.

    thread292-370252 Can I get ASME SEC IX interpretation number of below subject,which was discussed and closed in previous thread 292-370252. DonRoss (Mechanical) (OP) 1 Dec 14 13:53 Gents, I wanted to follow-up with my response from ASME. It hasn't been given an Interpretation number yet...
  7. QC7

    PWHT

    Hi, I have some query related with Local PWHT of piping spool as per B31.3. 1)Throught out heat tratment cyclce (resticted range) the temperature differential bewteen thermocouples registering peak temperatures shall be within limit of + or - 40degree celsius as per ASME Sec VIII , However...
  8. QC7

    Pipe line welding

    Thanks to all.... QC7
  9. QC7

    Pipe line welding

    Hi Team, Can you just explain me about technical reasons for below clause during pipeline fit up. 1 When a pipe with one longitudinal seam is used, this seam shall be within the top 120 degree of the circumference. 2 The longitudinal seams of consecutive pipes shall be offset by at least...
  10. QC7

    IQI Material

    Dear ndeguy, Pls go through SE-747 for "MATERIAL GROUPING CLASSIFICATION OF WIRE IMAGE QUALITY INDICATORS (IQI) USED FOR RADIOLOGY" As per SE-747,Materials have been designated in eight groups based on their radiographic absorption characteristics:groups 03, 02, and 01 for light metals and...
  11. QC7

    IQI Material

    Dear Team, what is the difference between wire IQI "6 FE EN" and "6 SS EN"? .Why two different IQI materials are available even-though both are in same group ? Is there any purpose for "6 SS EN" compare to " 6 FE EN" ?
  12. QC7

    IQI Material

    Hi Team, I would like to clear one of my doubt regarding improtance of IQI material? Whether is there any difference between "FE" ans "SS" IQI wire? Why some time client asking "SS" IQI wire for RT ? QC7
  13. QC7

    FBE coating inside the pipe spools

    TomDOT, Thanks. We instructed to do the same way ,Close all open ends with proper hard board. But i would like to know that what type of defect will appear ,if abrasive slag hit on internal FBE..like crack or any pin hole ???
  14. QC7

    FBE coating inside the pipe spools

    Hi Team, Could you explain ,Whether internal FBE Coating is necessary to protect from abrasive blasting like copper slag during the time of external painting on piping spools? Piping spools have two open flages at both side, and internal FBE (like TK 210 ) has carried out before the...
  15. QC7

    IQI Material

    Ok, now i understood the concept. Apart from above,Can you just explain more about approximate radiographic equivalence factor for steel,stainless steel and Inconel by using X ray as well as Cobalt 60.Whether its will same as like Ir192 ?
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