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Recent content by twjag

  1. twjag

    Flange materials - B16.5

    I assume by "round bars" you are referring to rings, or cylinders. The answer is no, except for forged rings, & pipe. You did not provide sufficient data to make a specific recommendaton. The general options for a flange are: 1. A forged ring for you to finish machine. 2. A finished...
  2. twjag

    Does anyone has a definition of wha

    For your case, the compressor housing would be exempt per U-1(c)(2)(c). The air/oil receiver would not be exempt per this paragraph. Though the receiver may be a "functional" part of the system, the receiver is not a "functional" part of the compressor. The compressor...
  3. twjag

    Fitting Alterations

    garnet1, You can address this question to Bonney Forge. Years ago, BonneyForge provided tables with full dimensions for WOL, TOL, etc., that gave you all the dimensions you needed for calculating reinforcement per the various ASME PV & piping codes. They no longer publish these dimensions...
  4. twjag

    Ovality of Nozzles

    BMOORTY, Per UG-80, permissible out-of-roundness for cylindrical shells is 1% of nomimal diameter at cross section. Pipe specifications also generally limit out-of-roundness to 1%, though some specs for fusion welded pipes allow 1.5%. Lacking other direction, I have used the 1% criteria of...
  5. twjag

    Calculations to be presented to ASME inspector

    Hi, A general add to previous posts is to identify all Code references in the calculation. These would include referecnces for all applicable Code paragraphs & formulas addressed in the calculation.
  6. twjag

    Pipe bend in Section VIII, Div 1

    deanc is correct. Minimum thichness after forming must equal or exceed the required calculated thickness. You must confirm this by final measurement, as would be required for any pressure part.
  7. twjag

    ASME code standars for lifting padeye design...

    chinus, The lift lug is a non-pressure attachment, & is not in use when vessel is operating. Therefore, the design parameters should consider safe load conditions. For design of the liftlug & attachment weld to vessel, we use the same factor of safety as for MSS Under the Hook Lifting device...
  8. twjag

    Code Violations

    esce, When you refer to rectangular flange, are referring to its cross section, or shape?
  9. twjag

    Max Size of Openings in Pressure Vessels

    deanc, You are correct. The design package must be accepted by the AIA. This includes design methods within the Code, & those offered based upon good engineering practice where the Code does not offer methods or formulas. Use of methods not contained in the Code must be adjusted to Code...
  10. twjag

    Max Size of Openings in Pressure Vessels

    spike, My previous post directed you to AWWA M11, which does provide rules for design & reinforcement for large opening approaching & equal to the shell diameter. It provides rules for "crotch plate" reinforcement.
  11. twjag

    Max Size of Openings in Pressure Vessels

    Per 1-7(c), "appropriate proof testing may be advisable in extreme cases of large openings approaching full vessel diameter, openings of unusual shape, etc." Per U-2(g, the Code acknowledges that it does not contain rules to cover all details of design & construction. Where details &...
  12. twjag

    DESIGN METHODS AND STANDARDS FOR RECTANGULAR STORAGE TANKS

    jamesh8448, Check out "Tubular Steel Structures, Theory & Design" The James F. Lincoln Arc Welding Foundation $15.00 US at http://www.jflf.org Chapter 7 "Bins & Bunkers" Provides design by large deflection theory
  13. twjag

    Thickness of ASME Section II - Part D Materials

    In general, the variation of allowable stress versus thickness in Section IID matches variaton in specified minimum tensile strength versus thickness in the material specification. The answer to your second question is no, there is no difference in allowable stresses in new and corroded vessels.
  14. twjag

    Reliefs on pressels - Need clarification

    For ASME VIII, 1 the requirements are laid out in UG-125 thru UG-137. UG-133 addresses capacity requirements including operating loads, fire protection, systems of interconnected vessels, internal failure for HX's, etc.
  15. twjag

    Design standard for flues and ducts?

    The flues & ducts external to the boiler, on both inlet & flue gas sides are beyond the scope of ASME Section I. The design pressures & temperatures for these flues & ducts are as specified by the boiler manufacturer. For inlet ducts on forced draft (FD) boilers, the minimum design pressure will...
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