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  1. PipelineEgr

    Hoop stress design factor for offshore flanges?

    My thoughts exactly guys. I've looked into all the relevant codes and there is no mentioned on hoop stress for a flange design. As what you all have said, they're designed based on the pressure-temperature ratings. Thank you both LittleInch and GBTorpenhow for confirming and the extra knowledge...
  2. PipelineEgr

    Hoop stress design factor for offshore flanges?

    Hi everyone, I was wondering if flanges follows the same hoop stress design factors for offshore pipeline used in, say ASME B31.8? For example location class 2 uses 0.5 factor whereas 0.72 applies along the location class 1. But what if, the demarcation point between location class 1 and 2 are...
  3. PipelineEgr

    Temperature de-rating for flanges

    Hi everyone. can anyone explain if flanges have any temperature de-rating factors used for design/material? i am aware of the pressure-temperature rating factor when choosing the flange # class. However, I would like to know if there are any temperature de-rating used maybe in ASME VIII Div. 1...
  4. PipelineEgr

    Differences between Table 1, 2, 3 and 4 in ASME Section II Part D

    iangineer, ouh wow that sounds like a good news.
  5. PipelineEgr

    Differences between Table 1, 2, 3 and 4 in ASME Section II Part D

    r6155, it is an M64, bolt will be tighten using a hydraulic bolt tensioning equipment.
  6. PipelineEgr

    Differences between Table 1, 2, 3 and 4 in ASME Section II Part D

    iangineer, 70% seems high, that is probably equivalent to 2/3xSMTS. Will that really be okay?
  7. PipelineEgr

    Differences between Table 1, 2, 3 and 4 in ASME Section II Part D

    SnTMan, I am working out the optimal bolt tensioning required based on the pipeline and flange parameters (e.g. forces, moments, no. of bolts etc), using ASME VIII Div. 1. However, my analysis found that the required tensioning exceeds the allowable tensile stress, in which it is greater than...
  8. PipelineEgr

    Differences between Table 1, 2, 3 and 4 in ASME Section II Part D

    Thank SnTMan, I note that the differences lies between each classes specified in Section III. However, I was wondering if i can tweak that allowable to suit my analysis. I have an issue with the bolt tensioning required for a flange design exceeds the allowable bolt sress. The current allowable...
  9. PipelineEgr

    Differences between Table 1, 2, 3 and 4 in ASME Section II Part D

    Hi, Does anyone knows the differences between table 1, 2, 3 and 4 and ASME Section II Part D? They seems to have different allowable tensile stress ratio (e.g. 1/4xSMTS, 1/3xSMTS, 1/3.5xSMTS). What table is applicable for a bolted flange design? My guess would be either 3 and 4 since the table...

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