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  1. engrdon

    Duplex (UNS S31803) welding fittings for ASME Section VIII, Div. 2 Service

    We have a Sect VIII, Div 2. vessel that requires S31803 duplex material for the fittings (elbows, reducers). Our supplier wants to provide SA-815 for Div. 2 service. We have scoured the Code, Interpretations, and Code Cases for any hint that SA-815 material is permitted in Div. 2 construction...
  2. engrdon

    Creep Rupture Strength Data for A335 P22

    ASME Section III, Division 1, Subsection NH, Class 1 Components in Elevated Temperature Service, Table I-14.6D shows the expected minimum stress-to-rupture values for 2.25Cr-1Mo material. The values are given in customary units as well as SI units. Hope this helps.
  3. engrdon

    Triaxial Stresses

    "The formula indicates that failure can occur for any condition of loading where the combined principal stresses equal or exceed the yield stress of the material." In the formula, the sum of the principal stresses must be less than 4 x Sm. If one uses SA-105 (when dealing with pipe), at...
  4. engrdon

    Triaxial Stresses

    Paragraph 4-137 of ASME Section VIII, Division 2, Appendix 4 states that "the algebraic sum of the the three primary principal stresses (sigma1+sigma2+sigma3) shall not exceed four times the tabulated value of Sm." I have searched the internet extensively and found papers and aticles on the...
  5. engrdon

    Rational basis for the R value used in seismic calculations

    I think this is the correct forum to address this subject. If not, please reply with the right one. I need a little help with the background on the developement of the R value used in seismic calculations. Has the R-value ever had a rational basis? That is, has it be quantified and validated...
  6. engrdon

    Pressure Vessel Standards

    swertel, There is no required duration of the hydrotest given in the ASME Code. The duration is something agreed upon by the client and the fabricator. However, we have used a duration of one hour for the hydrotest. We have used this approach for many years. If the vessel is going to leak...
  7. engrdon

    How to Determine Fracture Propogation in Pipe?

    Your first stop is to a bookstore or library to find a good text on fracture mechanics. I have found "Fracture Mechanics: Fundamentals and Applications" by T.L Anderson to be quite helpful.It also has a number of good examples. The K factor is a stress intensity factor associated...
  8. engrdon

    ASME EXTERNAL PRESSURE CALCS

    Due to the elevated temperature, a creep-buckling analysis must be performed based upon an agreed upon life expectancy. A rough outline of the steps are as follows. 1. Construct a finite element model of the item. (In this case a piping manifold). 2. The material properties used in the...

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