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  • Users: FoxRox
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  1. FoxRox

    Water Softener Regeneration Qestion

    I am trying to figure out if it is possible to "tune" a water softener to produce less brine when it regenerates by sacrificing some of the effectiveness. When a water softener regenerates, what is target "completion" for backwashing out all the calcium and magnesium ions? 100%? 99%? 90%? Do...
  2. FoxRox

    ASME BPVC VIII-1 UG-22(g) Submarine testing vessel

    A submarine is to be enclosed inside a larger pressure vessel. The space inside the vessel and outside the submarine is filled with water, and a hydrotest is performed to test the sub. If the submarine implodes, what loads affect outer vessel? I am thinking of something occurring like in the...
  3. FoxRox

    Thread repair in studding outlet ASME BPVC VIII-1

    Female threads in studding outlet got cross-threaded. Original threads are not salvageable. It is a very large flange. Replacing is possible but only as a last resort. Repair would be preferred. Does code have rules for how this can be repaired? NBIC Part 3 has a section (S2.13.14.1) for...
  4. FoxRox

    PIP VESBI002

    PIP VESBI002: Design and Fabrication of Bulk Solids Product Containers Is anyone familiar with this standard? The description says "Containers... shall generally be designed in accordance with the philosophy and requirements of the ASME Boiler and Pressure Vessel Code, Section VIII, Division...
  5. FoxRox

    API 620 roof joint tension / bending stress

    I am working my way through a cone roof design for a 12' diameter silo rated to 14.9 psi. I am using API 620 as a design basis, although the silo will not be stamped / monogrammed to any standard. The rest of it is designed per ASME Section VIII, but I've been asked to explore a shallow cone...
  6. FoxRox

    UL 142 Section 43 hydrotest

    I searched the forum and only came across this one old thread with no replies: https://www.eng-tips.com/viewthread.cfm?qid=49668 A client has specified horizontal UL 142 tanks to store a liquid with a specific gravity over 1.0. Attempts to push them to a more suitable design standard have...
  7. FoxRox

    SA-455 Material

    Trying to redesign an old vessel to latest code version. The old design had SA-455 shells and heads. Is this material no longer common or readily available for some reason? ASME BPVC Section VIII Div 1 Table UCS-23 allows the material, but our purchasing team is getting no-bids from all our...
  8. FoxRox

    Tying celestial mechanics to Earth’s ice ages

    As part of her professional organization membership, my wife receives this magazine. The cover caught my eye the other day, and I ended up learning something. Very interesting stuff here. It ties the multiple ways Earth's orbit changes cyclically over time to the cycle of ice ages as well as...
  9. FoxRox

    ASME Section VIII Division 1 Corrosion Allowance on Internal Projection of Nozzle

    I'm using COMPRESS for calculations and getting the following deficiency: I understand what this means (A3 from Figure UG-37.1 is non-existent), but I'm unable to find why this should be a deficiency, because the internal projection and internal weld are not required at all. The joint is per...
  10. FoxRox

    Interpretation VIII-1-89-264

    From Interpretation VIII-1-89-264: The reply here seems contradictory to me. It first says UW-33 is an alignment tolerance only. It then says UW-33 is also a design requirement. UW-33 is in the fabrication portion of UW, not the design portion, so the second sentence in the reply seems...
  11. FoxRox

    ASME Section VIII Div 1 UG-16(e) & UW-21

    I found some other topics about this, but I just want to make sure the answer is explicit and specific. On an ASME pressure vessel (not a pipe), when determining the required fillet weld size on the external leg of an B16.5 slip-on flange, can you subtract the corrosion allowance from the...
  12. FoxRox

    Cycling pressure to vacuum

    I have a new project for a vessel that cycles between 150 psi and full vacuum every 15 minutes during normal operation. This is new to me, and it's making alarms go off in my head about fatigue. If using ASME BPVC Sec VIII Div 1, shall I just design it for the pressure and/or the vacuum (worst...
  13. FoxRox

    How to get the info I want from phone interview

    I will be conducting a series of phone interviews for an engineering position. I would prefer to stay rather vague about the position. My employer is based in the middle of nowhere. Good engineers that will come here and stay here are hard to find. Consequently, we cannot be overly picky about...
  14. FoxRox

    ASME BPVC Sec VIII Div 2 Part 5 Training

    Is anyone aware of any seminars/classes in the coming months? A general class would be good. Better yet would be one revolving specifically around Creo Simulate. Thanks!
  15. FoxRox

    UG-36(g) vs. B16.9 - Eccentric Reducer Section

    I want to use a 48" X 36" eccentric reducer as part of a pressure vessel. The reducer conforms to ASME B16.9 (according to vendor; I don't have it), but it does not appear to be in compliance with Section VIII Div 1 UG-36(g)(2). The α on this reducer is well over 30 degrees. I attached a...
  16. FoxRox

    BPVC Code PDF files

    Anyone willing to share, please describe the process by which you or your company acquires pdf files of BPVC. I ask because I am curious if there are different ways or if it is generally consistent. I am new to being part of this process. Thanks!
  17. FoxRox

    Is U-stamp applicable?

    We are an oil field service pressure vessel manufacturer with a U-stamp. We mostly make heater treaters, gas separators, etc. We are developing a new product that could be called a "steam boiler". It will be a vessel containing a water-glycol solution with a large heat exchanger mounted in a...
  18. FoxRox

    Appendix 13-11 Reinforced Obround Vessel

    I'm trying to design a reinforced obround vessel per appendix 13-11. I'm stuck on trying to calculate 'I11' (moment of inertia of combined reinforcing member and effective width of plate w of thickness 't1'). The vessel will be designed just like figure 13-2(b)(2). I have 'w'. I have 'p'. I...
  19. FoxRox

    Sight Glass Check Valve

    I'm not sure if this is the best forum to put this in, but the sight glasses in question are going on pressure vessels, so here goes... This is concerning sight glasses on two-phase and three-phase separators for use in the oil field (up to 250 psi). Standard gauge cocks used for mounting sight...
  20. FoxRox

    Latent Heat of Vaporization

    I'm trying to size a safety relief valve for a 2-phase separator. Per the Crosby Pressure Relief Valve Engineering Handbook: W = Q/Hvap Where: W = Mass flow, lbs/hr Q = Total heat absorption to the wetted surface, BTU/hr Hvap = Latent heat of vaporization, BTU/lb My problem is Hvap. It's...

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