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OT Fire on the USS bonhomme Richard

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  • #31
    Originally posted by PStechPaul View Post
    I had a friend who, IIRC, was on a research vessel which had lots of microwave wave guide tubing, and they were filled with grain alcohol. So they would use the drain taps to spike their drinks.
    what was the purpose of filling the tubes with grain alcohol??

    JL....

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    • #32
      This was from about 45 years ago, so I don't know the details or even the veracity of the statement. The guy who told me this had worked as an engineer at NASA during the 1960s, so it seems reasonable that he would have had some experience with waveguides. And I know he had a lot of experience with alcohol and perhaps other substances that could have "flavored" his stories. It's quite possible that the waveguides were no longer in use, and were just a convenient place to store and access grain alcohol, which may have been forbidden. Also, waveguides can be subject to moisture build-up, and are sometimes pressurized or filled with something to avoid that and prevent rusting. There are "dielectric waveguides" that are filled with insulating material, and perhaps alcohol was appropriate. And perhaps it was used as a coolant.

      https://en.wikipedia.org/wiki/Wavegu...dio_frequency)
      .
      Last edited by PStechPaul; 07-22-2020, 06:36 PM.
      http://pauleschoen.com/pix/PM08_P76_P54.png
      Paul , P S Technology, Inc. and MrTibbs
      USA Maryland 21030

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      • #33
        Ethyl alcohol is somewhat polar (so it dissolves well in water), and would be a horrible lossy dielectric material I'd think. Sounds like a scam, liquor is not generally allowed.
        2730

        Keep eye on ball.
        Hashim Khan

        Everything not impossible is compulsory

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        • #34
          Originally posted by Ringo View Post
          ...and do all that while underway in a bad sea tossing you around......no thanks !
          It's the tossing around that makes it fun.
          The shortest distance between two points is a circle of infinite diameter.

          Bluewater Model Engineering Society at https://sites.google.com/site/bluewatermes/

          Southwestern Ontario. Canada

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          • #35
            As for whether or not the Bonhomme Richard is worth repairing (economically), recall the nuclear submarine USS Miami which was heavily damaged by fire (deliberately set) in 2012, and ultimately scrapped in lieu of a $700 million repair bill:

            https://www.navytimes.com/news/your-...o-be-scrapped/


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            • #36
              I have worked with a heck of a lot of wave guide but never even heard of filling it with any kind of alcohol. Dry air and nitrogen were frequently used, but never any liquids of any kind.
              Paul A.
              SE Texas

              And if you look REAL close at an analog signal,
              You will find that it has discrete steps.

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              • #37
                {Reactivating old thread}

                The Bonhomme Richard will be scrapped:

                https://www.navytimes.com/news/your-...homme-richard/

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                • #38
                  Paul, now you know where the US Navy which is supposed to be dry were keeping their illicit hooch.

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                  • #39
                    Originally posted by Paul Alciatore View Post
                    I have worked with a heck of a lot of wave guide but never even heard of filling it with any kind of alcohol. Dry air and nitrogen were frequently used, but never any liquids of any kind.
                    We used sulfur hexafluoride. Fine stuff unless you accidentally get some arcing and sparking. JR

                    The system we used it with was about 1.5Mw @10.---Ghz. Very small waveguide at high power.

                    The gas was used for cooling and spark prevention. I think it was the instructors scare tactic to get us to reassemble the WG correctly and carefully as to not create a potential arc point and possible hurt the klystron in the process (yes, there were other protections in place for large standing wave. I for get what they are call but a type of metallic window that would blow out.

                    If there were arcing and sparking the decomp of the hex gas would create other gases. Florine was one.

                    So yeah, it worked, never had any issues LOL.. JR

                    https://www.epa.gov/sites/production...byproducts.pdf

                    Good article
                    https://srmsc.org/msr5220.html
                    Last edited by JRouche; 12-02-2020, 08:46 PM.

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                    • #40
                      Originally posted by JRouche View Post

                      We used sulfur hexafluoride. Fine stuff unless you accidentally get some arcing and sparking. JR
                      Not quite so...

                      Sulfur hexafluoride (SF6) or sulphur hexafluoride (British spelling), is an extremely potent and persistent man-made greenhouse gas that is primarily utilized as an electrical insulator and arc suppressant.[7] It is inorganic, colorless, odorless, non-flammable, and non-toxic. SF6 has an octahedral geometry, consisting of six fluorine atoms attached to a central sulfur atom. It is a hypervalent molecule.

                      An excerpt from: https://en.wikipedia.org/wiki/Sulfur_hexafluoride

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                      • #41
                        Originally posted by reggie_obe View Post

                        Not quite so...

                        Sulfur hexafluoride (SF6) or sulphur hexafluoride (British spelling), is an extremely potent and persistent man-made greenhouse gas that is primarily utilized as an electrical insulator and arc suppressant.[7] It is inorganic, colorless, odorless, non-flammable, and non-toxic. SF6 has an octahedral geometry, consisting of six fluorine atoms attached to a central sulfur atom. It is a hypervalent molecule.

                        An excerpt from: https://en.wikipedia.org/wiki/Sulfur_hexafluoride
                        SF6 is used in line interrupters of power grid switches.
                        I used to work designing them.
                        Vacuum bottle interrupters have become more popular
                        for smaller Kv applications.

                        -D
                        DZER

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                        • #42
                          Reviving an old thread.

                          https://thehill.com/policy/defense/n...-destroyed-uss
                          Location: Saskatoon, Saskatchewan, Canada

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                          • #43
                            Originally posted by Arcane View Post
                            Why? I went to the link ( crappy links). Is it not the same stuff we know?

                            I didnt see anything new about that case. JR

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                            • #44
                              Originally posted by JRouche View Post

                              Why? I went to the link ( crappy links). Is it not the same stuff we know?

                              I didnt see anything new about that case. JR
                              Location: Saskatoon, Saskatchewan, Canada

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                              • #45
                                Hey JR. Focus on the headline and see if there is anything there that might be new...........................

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