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  1. flare9x

    ASME B31.3 - 304.2.1 Pipe Bends

    Not what im getting at.... Hoop stress acting on a bend stresses the ID, crown and OD etc... hence minimum wall thickness requirements and the differences in the calculations. If after bending it needs to be n thickness on the ID, crown and OD to adequately handle the hoop stress (governing...
  2. flare9x

    ASME B31.3 - 304.2.1 Pipe Bends

    @LittleInch ok but isnt hoop stress same in bend and an elbow ie we design to the stress and the the fabrications methods are independent of each other?
  3. flare9x

    ASME B31.3 - 304.2.1 Pipe Bends

    @racookpe1978 Approx ID = OD - 2Tnom
  4. flare9x

    ASME B31.3 - 304.2.1 Pipe Bends

    Ok In API 579 - the lorenz factor for pipe bends: NPS 12 * 1.5 = 18
  5. flare9x

    ASME B31.3 - 304.2.1 Pipe Bends

    right i get that.... 14" NPS = 14" OD... where NPS 4" = 4.5 OD So what do i use to work out the radius.... Long radius = 1.5 * pipe diameter... again which diameter to use? Or there are values stated: lets take 2".. If you do: 1.5 * NPS = 3 if you do 1.5 * OD = 3.5625 For B31.3...
  6. flare9x

    ASME B31.3 - 304.2.1 Pipe Bends

    outside or inside?
  7. flare9x

    ASME B31.3 - 304.2.1 Pipe Bends

    In calculating the radius, R1: Long radius = 1.5 * Pipe Diameter Is the diameter the outside diameter OR the values taken from ASME B16.9 which are the inside diameter.... or the stated nominal pipe size. Which diameter is used?
  8. flare9x

    Pipe Flange Bolt Stress - How does corrosion + reduced diameter affect original applied bolt stress?

    Yes thats the only way to mitigate the risk because the bolt inside the flanges you never know what the condition is.
  9. flare9x

    Pipe Flange Bolt Stress - How does corrosion + reduced diameter affect original applied bolt stress?

    i copied and pasted from excel
  10. flare9x

    Pipe Flange Bolt Stress - How does corrosion + reduced diameter affect original applied bolt stress?

    Perhaps: Corroded Diameter Stress = Original Force Applied / Corroded Reduced (Root or Tensile Area)
  11. flare9x

    Pipe Flange Bolt Stress - How does corrosion + reduced diameter affect original applied bolt stress?

    Ok so the corrosion and reduction in bolt diameter are not 100% even - so lets say we have full D, 1.5 at the tops and bottoms within the nuts. So in the middle, exposed area its reduced to 1.35 - so stress over an area at the 1.5 and 1.3 sections are different. So a static bolt stress, 63ksi...
  12. flare9x

    Pipe Flange Bolt Stress - How does corrosion + reduced diameter affect original applied bolt stress?

    Ok so lets say we have the following: B7 Bolt UNC 8, 105ksi yield Bolt Diameter = 1.5 (D) Lets say target bolt stress = 60% of yield, 63ksi. K = .16 Using ASME PCC-1 bolt root area - that gives Target Torque , T =(K D F / 12) ft-lbs = 1772.788205 ft-lbs So in theory - we apply the bolt...
  13. flare9x

    ASME 8 - MANDATORY APPENDIX 13 VESSELS OF NONCIRCULAR CROSS SECTION

    ok there is (eb) to account for in long plate membrane stress.
  14. flare9x

    ASME 8 - MANDATORY APPENDIX 13 VESSELS OF NONCIRCULAR CROSS SECTION

    I managed to track down original stress analysis report. This has evolved since I now found the construction drawings. It has a stay plate. So using the calculation for the Stay plate. I can replicate the outputs for the short plates. However the long plates I can not - this is because my c...
  15. flare9x

    ASME 8 - MANDATORY APPENDIX 13 VESSELS OF NONCIRCULAR CROSS SECTION

    Ha
  16. flare9x

    ASME 8 - MANDATORY APPENDIX 13 VESSELS OF NONCIRCULAR CROSS SECTION

    Ok thanks for the information so far. I should be good now - just one last clarification then I can get this going: In determination of the long and short side (L,S annotated) Do I need the orange or red?
  17. flare9x

    ASME 8 - MANDATORY APPENDIX 13 VESSELS OF NONCIRCULAR CROSS SECTION

    Ok got the manual here: ASME PTB-4-2013_Section VIII-Division 1 Example Problem Manual
  18. flare9x

    ASME 8 - MANDATORY APPENDIX 13 VESSELS OF NONCIRCULAR CROSS SECTION

    No example manual - wish i did at this point. I wrote all the equations using the R language. Ok then that helps clarify. To get the signs correct for c. The sign convention necessary to establish the proper algebraic sign of the stresses for combining membrane and bending stresses to obtain...
  19. flare9x

    ASME 8 - MANDATORY APPENDIX 13 VESSELS OF NONCIRCULAR CROSS SECTION

    Ok so in understanding the c term in relation to the neutral axis for: N, M and Q as below: The definition of neutral axis: c = distance from neutral axis of cross section to extreme fibers (see ci and co). The appropriate ci or co value shall be substituted for the c term in the stress...
  20. flare9x

    ASME 8 - MANDATORY APPENDIX 13 VESSELS OF NONCIRCULAR CROSS SECTION

    ...strength Sy of the material at the design temperature (see 13-5 for Sy) except.......... S is found in Section II, Part D, Subpart 1. Section II, Part D. S = 21,600 E = 1.0 Sy = 38,000 St = 70,000 S per (1) = 1.5 * 21,600 * 1.0 = 32400 That allowable S = 32400 / 38,000 = 85% of the...

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