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  • What ASME section covers in-service repairs and alterations?
    The in-service repairs of pressure retaining items does NOT fall under ASME Boiler and Pressure Vessel (B PV) ASME B PV Code is a construction code, not an in-service inspection or repair code In -service inspection, repair and alteration activities are either governed by API (petrochemical) or by the National Board Inspection Code (NBIC) NB-23 You should first determine what the
  • Nubbins | Eng-Tips
    John- In my experience, "the only good nubbin is a machined off nubbin!" More seriously, most of the time I ran across nubbins on exchangers which were designed for double jacketed gaskets If we were not upgrading the gaskets, we did nothing If we were upgrading the gasket - usually to a kammprofile (GMGC) style - I would call for the nubbin to be machined off Never had a problem On the
  • Nubbin | Eng-Tips
    A nubbin is just a small tooth obtained by machining on the joint contact area of a flange This is a very detailed issue and is normally specified by joint manufacturers for use with specific types of joints
  • Effective Gasket Width in ASME VIII-1 App2 Calcs | Eng-Tips
    Hello there I am trying to do the calculations in ASME VIII-1 App 2, however, I do not understand how to calculate "N" (based upon the possible contact width of the gasket) On what aspect of the gasket do we base it : the sealing element of the gasket or the actual surface contact of the
  • Nubbin on a Body Flange | Eng-Tips
    What drives the requirement for a Nubbin on a Heat Exchanger Shell Flange?
  • Appendix 2 Flange Calculations with Nubbins | Eng-Tips
    Two existing girth flanges are mated together One flange has a nubbin 1 64” high and 1 8” wide The gasket used between the flanges is DJAF iron, that is 1 2” wide Question: When considering the facing on the flanges as Type 2 (per Table 2-5 2, from Sec VIII, Div 1, Appendix 2), the joint
  • ASME B16. 5 Class 600 Flange Face - Min Raised Face? | Eng-Tips
    I've been asked to design a flanged joint using a pure copper gasket to seal Fluorine gas at 1000 PSI I looked at ASME b16 5 and thought that a class 600 raised face design would work, but couldn't understand what the minimum thickness (width) of the raised face could be I wanted to I use
  • Specify tongue and groove gasket seating width | Eng-Tips
    What the Code calls a nubbin, a narrow raised area on the flange gasket seating face, is often used with flat solid metal gaskets to reduce the seating load and required bolting The Nmin calculation is not part of the Code, but some handbooks, specifications, and software perform it and select the N based on that
  • Tema Type R, confined gaskets, and nubbins | Eng-Tips
    TEMA allows the use of any desired facing, including the described nubbin I generally avoid them except with flat metal gaskets, but that's personal preference
  • Flange Finish for Spiral Wound Gasket | Eng-Tips
    Flange face finish The ASME B16 5 code requires that the flange face (raised face and flat face) has a specific roughness to ensure that this surface be compatible with the gasket and provide a high quality seal `A serrated finish, either concentric or spiral, is required with 30 to 55 grooves per inch and a resultant roughness between 125 and 500 micro inches This allows for various grades





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