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  1. scott1971

    Origins of "FPM" and "FFPM" for fluoroelastomer and perfluoroelastomer?

    Hi Friends, I'm trying to determine the origins of the terms "FPM" and "FFPM." It's not uncommon to see "FKM/FPM" or "FFKM/FFPM" (or variations) when generically specifying fluoroelastomers and perfluoroelastomers respectively—or fluorocarbon and perfluorocarbon rubber if you will. From both...
  2. scott1971

    Ethanol storage for hand sanitizer/mouthwash processing

    Consider ASME BPE (Bioprocessing Equipment Standard). Section SD-4.7 in the 2009 edition would be a starting point. Since the contents will be used in "pharmaceutical" products, it follows that ancillary systems that convey raw materials to be used in those products must meet the same...
  3. scott1971

    Repainting 100-year-old galvanized steel

    I have it on good authority that the siding is galvanized steel and the base metal has the spangle patterning typical of galvanization. We definitely don't want to replace the siding itself. I've read that alkyd paints are not suitable for direct application to galvanized steel (i.e., must use...
  4. scott1971

    Repainting 100-year-old galvanized steel

    The area to be painted is quite large. It is an 8-story building and the siding is under and between windows on each floor on three sides of the building. I estimate about 4000 sq.ft. Click here for a pic of the building. Everything that's gray needs to be painted. You can see that it's not...
  5. scott1971

    Repainting 100-year-old galvanized steel

    Hello fellow engineers! I live in a 100-year-old building with painted galvanized steel siding. The paint is severely damaged and is flaking off (please see pics). There are areas of surface rust, but nothing I would consider serious. I do not know if this is the original paint or if/when...
  6. scott1971

    ASME ôU Stampö for Acrylic Pressure Vessels?

    Thanks Charles, I'm involved in that very industry and discussed this further with Guy R and John D at the recent BPE meeting in Dublin (John and I work for the same company). I appreciate your comments and they will certainly add value to the thread. I was just looking for third-party...
  7. scott1971

    ASME ôU Stampö for Acrylic Pressure Vessels?

    CodeJackal, Thank you very much for your valuable input! I don't have access to PVHO at the moment, and the information you provided definitely put things into perspective. Scott Scott ====================================== "You can marry more money in five minutes than you can make in a...
  8. scott1971

    ASME ôU Stampö for Acrylic Pressure Vessels?

    Hi friends, According to this web page, pressure vessels conforming to Section VIII may incorporate acrylic cylinders and be U-stamped. The page goes on to say "The American Society of Mechanical Engineers (ASME) has now approved the use of acrylic in the construction of pressure vessels under...
  9. scott1971

    Thrust Chamber Test Bench

    BoomerSooner7: You said... Unless I'm missing something, I disagree with that statement. The motor also "sees" the torque required to rotate the impellers that pump the fluid. As you increase the flow rate and/or TDH, the required BHP also increases. I'm guessing that the purpose of your...
  10. scott1971

    Must a chromatography column comply with BPVC?

    Metengr, Thanks for your reply. Of course, if the customer is willing to pay for it, we're willing to build it. Your statement that is what really caught my attention. If, indeed, the code does not consider operational scenarios, then from a technical fabrication perspective—which is my...
  11. scott1971

    Must a chromatography column comply with BPVC?

    Hi friends, I work for a company that manufactures liquid chromatography columns for biopharmaceutical purification. On most customer specifications that I receive for these columns, a U-stamp is requested or, at least, "conformance to Section VIII." I am also involved with the authoring of a...
  12. scott1971

    Typical control valve actuator design - help with basics

    Thank you everyone for the responses thus far. To be clear, I am trying to understand the design origins of the typical control valve actuator (or "top works"). For a diaphragm actuated assembly, the diaphrgam is usually 8 to 12 inches in diameter and sits on the very "top." It is either...
  13. scott1971

    Typical control valve actuator design - help with basics

    I am confused by all of the features normally found on a "typical" control valve actuator. To keep this post simple, I am referring to the traditional diaphragm actuator type represented in the link. The purposes of the diphragm, spring, and actuator shaft are obvious. However, if all I'm...
  14. scott1971

    conversion list for stainless steel identification

    Check Outokumpu. Look at this PDF: http://www.outokumpu.com/33342.epibrw
  15. scott1971

    Slag in autogenous orbital welds 316L tubing?

    Thank you to everyone for your input. As an update, it turns out there never was any slag or other imperfections. We inspected the welds optically with sight tubes and they were clean. Lens and lighting effects from the borescope created the illusion of imperfections. A good experience for...
  16. scott1971

    Slag in autogenous orbital welds 316L tubing?

    A borescope video log of the welds in a 316L sanitary tubing system was sent to a third-party inspector and they have rejected 17 welds due to "slag." Based on my limited understanding of common welding practices, I thought slag was the result of using a filler material or welding dissimilar...
  17. scott1971

    Motor direction for VFD powered motor

    Hi all: I have a piece of equipment with two (2) 480 VAC 3-phase motors on it. One of these motors is controlled by a VFD, the other is branched directly from the main feeder. When my customer has the equipment located in Room "A" both motors rotate in the correct direction. When the...
  18. scott1971

    RTD lead extensions, can I use terminal blocks?

    Thank you all... I believe the RTD being used was 3-wire, but I'll need to check with the technician. The RTD and controller are on the same skid, so even a small distance if it is two-wire won't be critical for my application. I love this site.
  19. scott1971

    RTD lead extensions, can I use terminal blocks?

    Hi, all: I've read a few posts and think I might have the answer, but thought I would run this for any experts who can confirm. I have an RTD whose leads are not long enough to reach my controller input (an Opto 22 RTD "puck"). My initial thought was to terminate the leads at a...
  20. scott1971

    conduit practices in class 1, div 2 areas

    Mike: I know I'm a Chem.E, but I've done a number of Class I, Div. 2 installations in my work. If I understand you correctly, your "field" components are all equipped with XP enclosures. So long as these components have no arcing contacts AND none of your wiring has...

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