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  • Users: nuche1973
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  1. nuche1973

    Stainless Steel at high temperatures

    Greeting every body. I recently conducted a search on 304L and 304 stainless steel at high temperatues and was rewarded with an older post that was similar to my question. I was able to use the information in that post to answer my question. However, someone was also nice enough to include in...
  2. nuche1973

    Location of Older US Steel studies

    Greetings all. I am looking for the following: "Applied Research Laboratory, United States Steel, Theoretical and Experimental Study of Steel Panels in Which Membrane Tension is Developed, Project #57.019-905" Any information/leads would be greatly appreciated. Thanks. "I drank what?!" Socrates?
  3. nuche1973

    Flanges - angle ring vs ANSI

    Greetings all: It has been several months since I logged on. I am familiar with ANSI 150 flanges and bolt patterns. But, not to knowledgeable of Angle flanges and bolt patterns. My question is who is the governing body over the design of Angle Rings "flanges" and where can I find a list of...
  4. nuche1973

    Baja Mexico Seismic data

    I am looking for a map of the Long-Period Transition Data for the Baja Peninsula, similar to Figure 22-15 of ASCE7-05. It's ok if it is in spanish. Thanks. "I drank what?!" Socrates?
  5. nuche1973

    Pipe sized tubing

    Got into a discussion about piping and fatigue. The terms that were thrown around were "Piping", "Tubing" and "Pipe Sized Tubing". We have a blow pipe (I use pipe because I am not sure what is installed) that snapped due to fatigue. The pipe spans 9 ft, with blow holes every 9". Compressed air...
  6. nuche1973

    ASME Bolted Covers Rectangular.

    Greetings: I am working with ASME Section VIII Div 1 2007 with 09 addenda. I have been asked to design a flat entryway cover for a round dust collector. The design positive pressure will be 40 psi. The cover will be a rectangular plate. I am calculating the minimum thickness in accordance to...
  7. nuche1973

    PRV - personal question

    Greetings all: I have a question...I am purchasing a house and the incomming water pressure is 51psi. I had a to hire a plumber to pressure check my lines and he suggested that I install a PRV (pressure reducing valve). He claimed that it would increase the water pressue in my lines. This...
  8. nuche1973

    NCH433

    Does anybody know where I can get a free copy of this in pdf format? All of my searches are for paid sites or I can download a copy, but cannot print it. Thanks There are days when I wake up feeling like the dumbest man on the planet, then there are days when I confirm it.
  9. nuche1973

    Shock Resistant Equipment

    I have an unusual question: Yesterday a co-worker gave me a hard copy of an email it read: “Explosion Shock Resistant (ESR) = 12,000 psi per sec explosion shock resistant equipment rating” We’ve had equipment rated for shock resistance before, but the units were in psi or pressure. I conducted...
  10. nuche1973

    Roark's - possible error in tabulated values

    I am looking at Table 11.4 "Fomulas for flat plates with straight boundries and constant thickness", case 7a, tabulated values for Beta 2, of Roark's Formulas for Stress and Strain, 7 edition, 2002: The values seem to be parabolic and not linear, whereas, the values for similar tables appear to...
  11. nuche1973

    Rolled Plate analysis.

    If you take a cylinder, capped at both ends, made from .25in 304SS, and cut it in half. Does ASME Section VIII criteria for external pressure still apply? The half cylinder would be fully welded to a flat plate. How does one analyze the stresses in the rolled plate? The plate is rolled to a...
  12. nuche1973

    Would you go back?

    Several months ago, me and my cad-tech were laid off. Call this person my cad tech because he and I worked together for nearly 4 years. The company's stance on training was that if a person, cad techs in particular, wanted additional training, they would have to accquire it on their own. I...
  13. nuche1973

    Domed plates

    I am working on a panel that will withstand 27" of water (1psig). The client wants to use 304L stainless steel, the panel itself will be of varying dimensions and also a circular version, both of various thicknesses. I have a spreadsheet set up to evaluate the panels vs thickness at 1 psig. My...
  14. nuche1973

    NFPA 68

    NFPA 68 gives a maximum mass for vent panels as 40 kg/m^2. I am not sure if this is meant to be 40 kg(force)/m^2 or if I need to multiply the number by the acceleration due to gravity. I am designing a vent panel and am having trouble deciphering what is required by the code. I am working in...
  15. nuche1973

    ASME Section VIII Appendix Y

    Greetings all: Can any one clarify the definition of Ab in appendix y? I am calculating the stresses in a loose flange (Class 1 Category 2 type flange). My vessel is operating at 14.5 psi (304L) material. My hang up is the Operating Bolt stress (eqn 11) is extremely high (230 ksi) for a 1/2"...
  16. nuche1973

    PE-Exam question

    Ok this one is for fun: I am studying for the new combined 16 hour structural exam. While reading the introductory chapter to one of my review books, I found the following under the heading “Prepare for the Worst”: “Imagine the distraction of someone crying…” At first I burst out laughing...
  17. nuche1973

    Plate stress - vacuum pressures

    Greetings all, I have a particularly interesting problem. For several months I have been checking the design of dust collectors. This involved verifying the housing thickness with respect to the vacuum and deflagration pressure, for both round and rectangular collectors. As you may be aware...
  18. nuche1973

    Effective width using AISC 13th edition

    I am using Table B4.1 to determine my effective width. I have a 12guage steel plate, 120”x120”. The plate is stiffened with 3”x 1/4” bars at 24”on center. The final section will resemble the example detail in the table for cases 7 and 8. However, my question is: do I double the b value when...
  19. nuche1973

    ASME 2007 Section II part D look up

    Ok, I'm in a pinch. I am with-out the ASME Section II. I need the allowable stress values for SA516-70 steel at 120 deg F. Most of my work involving the B&PV code has involved stainless steel (like 316L). I keep copies of the data in the submitted calculations, for stainless steel. However, due...
  20. nuche1973

    NFPA-pressure at deflagration

    When determining the maximum internal pressure of a dust collector: is it correct to assume that the hopper will be empty at deflagration? NFPA 68 doesn't clearly define this. Also, is it correct to assume that wether or not the hopper is full at deflagration is a product to product...

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