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Recent content by rocketscientist

  1. rocketscientist

    Safe zone around purged vessel

    TiCl4: good point. Measure first before bothering with the $ for safeguards. That's my plan. Step 1: test the O2 during the production run; keep a 5-ft distance until the maiden product run. Step 2: implement safety requirements. From worst to best: a) SCBA with room, personal monitors, and an...
  2. rocketscientist

    Safe zone around purged vessel

    shvet: Yes, by law in vent systems, a certified measured velocity of 50 fpm (min.) is acceptable at the "shash" of the vent (Lab vents have a gap below the window.). This rule applies to all hoods and vent intakes. Generally, engineers design for about 100 fpm to be safe. Oh, and that is a good...
  3. rocketscientist

    Safe zone around purged vessel

    TiCl4: Yea, I've used SCBA. It's difficult but doable. Latexman: (We've met before online.) Pharma doesn't like to spend money on safety and they tend to be so ignorant of safety rules. They are too driven by quality. When I did a stint at one of their plants to clean up HAZOP safety...
  4. rocketscientist

    Safe zone around purged vessel

    I know it's hard to believe nobody in pharma heard of the Valero N2 purge accident covered by the CSB. https://www.csb.gov/valero-delaware-city-refinery-asphyxiation-incident/#:~:text=Two%20contract%20employees%20were%20overcome,the%20workers%20died%20attempting%20rescue. Unfortunately, I am...
  5. rocketscientist

    Safe zone around purged vessel

    I work as a consultant for a pharmaceutical company that regularly allows their operators to access purged vessels. I was wondering if someone had come across an estimate for establishing a rough zone around an open manway. I am thinking of requiring SCBAs for this type of work but they do it so...
  6. rocketscientist

    Filter static electric discharge

    Recently, an operator saw an arch jump between a top bolt and the filter housing, a distance of about 2 inches. The filter is of spirally-wound cotton; it does not contact the wall of the filter housing. A long bolt runs axially through the middle of the filter housing holding the top head and...
  7. rocketscientist

    Wetted area, Pool Fire Scenario, Packed Column, Bed, Chromatography Column

    I have an interesting problem for you. I am reviewing a rupture disc sizing of a chromatography column. Typically, these are packed beds with media or beads. There is a mobile phase that contains a solvent and a stationary phase. Solvents used in this column include ethanol and amyl acetate. By...
  8. rocketscientist

    Vibrating thin-wall SS pipe

    I have a 6" schedule 5 pipe running about 92' to the top of an absorption column. It carries cooling tower water to coils running the length of the column shell. Unfortunately, it vibrates about 1/8," so much so that I couldn't get a reading with a portable ultrasonic flow meter. Someone has...
  9. rocketscientist

    Acquiring ASME stamp for European-stamped vessels

    RE: stamp A stamp from the country of origin. It may not have been intentionally built to American (ASME) standards but the calculations by an engineering firm show that it meets, or should I say, met, ASME standards when built. I am hoping I can find an inspector who will say: hydrotest it...
  10. rocketscientist

    Acquiring ASME stamp for European-stamped vessels

    I don't think you understand: these vessels were built in Europe in the 1970s and have been in service here, in the US, for decades. An American engineer did calculations showing that the vessels meet code, as far as I can see, but there is nothing to say that the vessels are adequate for...
  11. rocketscientist

    Acquiring ASME stamp for European-stamped vessels

    I have several vessels that were built in Europe and installed in our plant. We have calculations and the European stamps (on the vessel) but we are missing mill test reports. Are there any ASME Code VIII Div. 1 inspectors who can advise how we can certify these vessels. Our alternative is to...
  12. rocketscientist

    Hysys rental

    I just got a request for some design work. I have Pipe-Flo Pro, a hydraulic program but I need Hysys or ChemCAD because the process involves natural gas/lights liquefaction, compression, and separator design and specification. Hysys, as we all know doesn't offer short term leases. ChemCAD does...
  13. rocketscientist

    Minimum section cut of a pipe

    I'm specifying a probe for larger horizontal tanks. Unfortunately, none of tank nozzles have the same length. The client wants the same probe for each tank to reduce the number of probes of different lengths. My current plan is to specify long so that I can have the piper specify the section of...
  14. rocketscientist

    HYSYS column with trace water won't converge

    I am developing a complex de-ethanizer column to simulate what Henry Kister described in his book, (Case study 2.10) "Distillation Troubleshooting." I set up the column initially with Peng-Robinson with feed at 80 F, pressure at 350 psig. Initially, I disconnected the side-streams going back to...
  15. rocketscientist

    threaded joints for pipes and valves

    Where I've worked in the past, socket-welds have replaced threading for pipe less than 2" in size. Another accepted approach is bent tubing but these often have the same problem as threaded. As for larger threaded pipe (>3"), I can't see it. Like ball and globe valves larger than 3" they are...
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