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  1. rww88

    External Nozzle Loads TEMA Standards RGP-RCB-10.7

    The 9th edition of the Standards of the TEMA recommended good practice section of Section 5 Mechanical Standards TEMA Class RCB (RCB-10.7 Design of Large Diameter Ratio Shell Intersections Subjected to Pressure and External Loadings) offers stress equations based on the Pressure Vessel Research...
  2. rww88

    PVP 1279 confusion

    PVP2002-1279 "Stiffness Coefficients for Nozzles in API 650 Tanks" (published in 2002) makes the following statement regarding the FEA model for which it is based: "Nozzles were chosen to have reinforcing pads with equivalent dimensions of Table 3-6 column 5 of API 650." Older editions of API...
  3. rww88

    API Standard 650 material groups

    I thought I would try my luck here in the Metal and Metallurgy engineering forum on this one. It has been five days without a single response since I posted this same question in the Storage Tank engineering forum where I surmised it to be more appropriate: What is the underlying factor or...
  4. rww88

    API 650 material groups

    What is the underlying factor or factors that differentiate the API 650 material groups. This question was raised when I observed that a flush-type clean out fitting's maximum opening dimensions are dependent on material group number. I cannot find a simple definition of material group other...
  5. rww88

    Use of the term "vertical diameter"

    Would anyone care to comment on the meaning of the term "vertical diameter" in the following passage from API 650? "The minimum cross-sectional area of the required reinforcement shall not be less than the product of the vertical diameter of the hole cut in the shell and the nominal plate...
  6. rww88

    Flange design - economic hub thickness selection

    I have a single page from what appears to be a very old untitled source (book?) that refers to an exhibit (a graph) within the source that can be used to determine the initial selection of an economic hub thickness (g1) of a tapered-hub integral-type flange. Not having the graph, it appears from...
  7. rww88

    Thicker shell or add stiffener?

    Let me begin by stating that my query is a hypothetical one and very general in nature; consequently I cannot supply specifics like material specifications and exact dimensions. Who knows, maybe their exists no available general answer or rule-of-thumb. The situation is one in which an economic...
  8. rww88

    PTB-4-2013 Eample E4.3.7 mystery variables

    The ASME Code Section VIII Division 1 solution method presented in Example E4.3.7 of PTB-4-2003 provides and equation for the combined force factor f<sub>2 </sub> that consists of variables F<sub>S</sub> [axial force] and M<sub>S</sub> [net section bending moment] for which I am unable to locate...
  9. rww88

    Extruded opening in vessel shell

    Is the extruded opening shown in the attached drawing practically feasible, either through hot or cold forming? If so, what would be a sensible size (diameter) for the pre-hole? The material is low-allow carbon...
  10. rww88

    Category A or Category D attachment weld?

    Is the attachment weld shown in the figure actually a Category A weld?http://files.engineering.com/getfile.aspx?folder=8225eeb8-41a3-4ff3-a7eb-96359ed200c5&file=Cat_A.JPG
  11. rww88

    ASME Code Section VIII Division 2 Part 4 Category E weld

    Table 4.2.11 Details 1, 2, and 3 logically indicate that the primary sealing nozzle attachment welds are joint Type 7, Category D. Are the outer perimeter attachment fillet welds of the opening reinforcing elements (repads) shown in these details and labeled "tf1" considered Category E welds?
  12. rww88

    ASME Section VIII Division 2 Part 4 Category E weld

    Table 4.2.11 Details 1 and 3 logically indicate that the primary sealing nozzle attachment welds are joint Type 7, Category D. Is the outer perimeter attachment fillet welds of the opening reinforcing elements (repads) shown in these details considered Category E welds?
  13. rww88

    Fabrication techniques for openings

    I am conducting research on the fabrication methods of tanks and pressure vessels, and in particular the methods in which raw openings are created in shells and heads. I am hoping that individuals here that are fabricators will share their common practices. For instance, what are the preferred...
  14. rww88

    Figure UW-16.1 weld size

    In a particular nozzle, I am joining trn to t with a figure UW-16.1(a) type joint. At UW-16(b) it states that, tc = not less than the smaller of 1/4 inch or 0.7 tmin, and tmin = the smaller of 3/4 inch or the thickness of the thinner part to be joined. Does it not logically follow that in my...
  15. rww88

    Let's revisit the infamous F correction factor

    There has been much discussion in this forum regarding the F correction factor of UG-37 and Figure UG-37. Through these discussions I have garnered a complete explanation and consequently, understanding, of the theoretical aspects of this factor. I need no further explanations; what I do...
  16. rww88

    Oxidation specks on ss sheet metal

    We are using 24 gauge 304 stainless to flash (waterproof) windows of a masonry building located a mile inland from the Atlantic ocean. After several months, exposed areas of this flashing along the face of the building were observed to exhibit a pattern of some form of surface oxidation. Specks...
  17. rww88

    ASTM A312 wall thickness

    I do not have a specification readily available. Can someone inform me on the allowable mill tolerance on the wall thickness?
  18. rww88

    &quot;F&quot; factor Chart Fig. UG-37

    Is it just me, or is the little diagram in the upper right corner of Figure UG-37 somewhat confusing? As presented it appears that ? is indicating a relative radial location of a nozzle. Am I missing something here? Maybe I don’t understand the relationship of the “F” factor and the longitudinal...
  19. rww88

    Branch pipe required replacement area

    I am having difficulty understanding the factor (2–sin ?) in the area replacement calculation. By my way of thinking, the parallelogram cross section resulting from a “skewed” branch pipe has the same area as the rectangular cross section when ? = 90°. Why must the area be augmented by (2–sin ?)?
  20. rww88

    Illegal Plan Stamping?

    How many of you have seen the website whereon a Pennsylvania P.E. is blantanly advertising “plan stamping” services? If you have not, after reading this message, point your browser to www.engineerapprovals.com. This website's service flies in the face of every engineering licensing law that I...

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