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  1. WDSeng

    B31.1/B31.3 Nominal Material Thickness for Slip-On Flanges

    SntMan, Thank you for your insight. Dhurjati Sen, Thank you for your reply. A slip-on flange requires fillet welds (as shown in my screenshot above) and no that doesn't provide any clue. david339933, Thank you for your reply. Para 331.1.3(a) defines the term control thickness and per...
  2. WDSeng

    B31.1/B31.3 Nominal Material Thickness for Slip-On Flanges

    Hello, I have searched and read past posts but did not find any related to the specifics of my following topic. ASME B31.1 and B31.3 PWHT exemptions reference nominal material thicknesses when determining if PWHT is mandatory. Their definitions of nominal material thickness are listed below...
  3. WDSeng

    Define an Examination Lot per ASME B31.3

    Thanks everyone, I appreciate your feedback. I will touch base with the supplier and let you know the outcome.
  4. WDSeng

    Define an Examination Lot per ASME B31.3

    metengr, Contract specifications are still being developed. When minimum required examination was not listed then questioned we were told those requirements would be met by overall manufacturer not per this single contract. This raised a red flag with me. Let's say we have contracts A, B and...
  5. WDSeng

    Define an Examination Lot per ASME B31.3

    Hello Everyone, I am working with an ASME code fab shop that is fabricating and testing a few small piping systems (8 butt welds each) per ASME B31.3. The pipe fab shop and I have a difference in opinions on what defines a lot. Per ASME B31.3-2014 para 341.4.1(b)(1), "not less than 5% of...
  6. WDSeng

    Using B16.5 Flange Bolting to Secure a Bracket

    Thanks for providing input everyone it is appreciated. LittleInch, the longer bolt and second nut provides the ability to adjust or remove the bracket without unloading the flange (just as jgKRI thought). I don't see this needing to happen but just in case. Thank for you for mentioning flange...
  7. WDSeng

    Using B16.5 Flange Bolting to Secure a Bracket

    Hello, I would like to secure a bracket to a stud bolt on a B16.5 pipe flange. The bracket will be sandwiched between two hex nuts as shown in the attachment. I would like feedback on whether this approach is acceptable per ASME standard or code. I was unsuccessful finding anything in ASME...
  8. WDSeng

    B16.5 Flange Modified with Dual NPT Threaded Holes

    For future reference here is an update to this topic. Original Post: Step 1: Calculate the required thickness of the flange per ASME BPVC Section VIII Div. 1 UG-34(c)(2) equation (2) for bolted blind flanges. Step 2: Calculate the reinforcement required for the openings in the flange per ASME...
  9. WDSeng

    B16.5 Flange Modified with Dual NPT Threaded Holes

    Thanks XL83NL for the feedback and the topic link. I am familiar with that topic but it does have recent additions that I was unaware of and will need a more thorough review. I have done a somewhat exhaustive search on this forum but was never able to narrow down a definitive approach for this...
  10. WDSeng

    B16.5 Flange Modified with Dual NPT Threaded Holes

    Hello Everyone, I have a request from a customer for a various B16.5 flanges with dual NPT threaded openings. One example is an 8” 150# B16.5 A182 F316/F316L flange modified with dual 1-1/2” NPT threaded openings that are 4.50” apart (each are offset 2.5” from center, see attached). The...

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