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  1. KiddT

    A668 above 400F per Code Case N-71

    I was looking at using a forging support that would fall under the jurisdiction of ASME III subsection NF. One of forging materials available was A-668 which is mentioned as an acceptable material for NF in code case N-71. When I was looking up the allowable temperature for this material, I...
  2. KiddT

    Stress Classification at Cutwater of Sect III Class 3 Pump

    My understanding is also that Class 3 components are similar in nature to the design basis of VIII Div. 1 and I also believe from going through the codes that secondary stress are not considered for those codes. I'm a little curious how it can be asserted that except at a flat plate or face...
  3. KiddT

    Stress Classification at Cutwater of Sect III Class 3 Pump

    I sort of figured linearization may not be ideal for this case based on the geometry. Thanks for the quote that sums it up fairly well. I do still have a question though. You're mentioning a plastic analysis following NB-3228 but if I'm not mistaken for a Class 3 Component following Subsection...
  4. KiddT

    Stress Classification at Cutwater of Sect III Class 3 Pump

    I'll lay out the useful information as best I can. The code that must be followed for this is Sect III, Div. 1, Subsection ND (Class 3). This is for a single volute casing pump (similar in theory to Fig. ND-3423-1). Let me also start by saying the functionality of these pumps isn't really in...
  5. KiddT

    Section III NF Bolting Stress Limits

    So if you're making a non Flange (a standard support per NF-1214 in this case), you use the Su/2 as the maximum allowable? I was just surprised because if you were to use a SA - 307 Gr.A Carbon Steel bolt (per code case N-249) then Su/2 is 30 ksi which is pretty close to the yield value (36 ksi...
  6. KiddT

    Section III NF Bolting Stress Limits

    I'm a little thrown by what I'm reading in Section III, Division 1, subsection NF for supports in regards to bolting stresses. I was originally under the impression that the limiting stress for all parts/bolts etc would come from Section II Part D Tables, but it seems like that may not be the...
  7. KiddT

    Odd Bolting ASME Code Jurisdiction Question

    Ok that is definitely helpful for the vacuum part of the consideration because of the way the question is worded. But for bolts that only see stress due to gasket preload, do the requirements apply? I only ask because in the wording of this interpretation its asking about clamping bars and...
  8. KiddT

    Odd Bolting ASME Code Jurisdiction Question

    I'm looking at an elliptical manway application in a pressurized tank, which is IAW Section VIII, Div. 1, and as part of the assembly there are bolts that are used to tighten the manway cover to the ring and seat it on the gasket. My question is whether the bolts, which are outside of the...

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