jeff Member

  • Member since Jul 5th 2014
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  • jeff

    Post
    (Quote from Curbina)

    As people have stated previously, stainless steel galls easily; it also has a tendency to work harden, making drilling difficult. Some vacuum hardware utilizes silver coated threads to avoid this problem. For example, the threads on…
  • jeff

    Post
    (Quote from Alan Smith)


    Rather than worry about oil contamination, I purchased a Pfeiffer MVP-202-3DC dry diaphragm pump. Pfeiffer Vacuum recommends this type of fore pump for their TMU-262 T/M pump. Based on Pfeiffer's data, it should be possible to…
  • jeff

    Post
    The turbomolecular pump arrived today. The power supply should be here in a few days. I have not decided yet whether to use an oil-based roughing pump with a foreline trap and valve or go with an oil-less diaphragm pump, such as is offered by Pfeiffer.…
  • jeff

    Post
    (Quote from magicsound)

    From where did you order the thermowell? Most of the ones I saw are designed for high pressure usage, entailing a wall thickness much greater than is necessary for our use.
  • jeff

    Post
    (Quote from Paradigmnoia)

    Here is a photo of what I was describing.
  • jeff

    Post
    (Quote from Paradigmnoia)

    When building a flow calorimeter I machined 1/2" plexiglass to accept the square hole pattern of the fan on one side and a 2" PVC pipe on the other side. Plexiglass can be bonded to PVC with the plumber's cement sold at…
  • jeff

    Post
    (Quote from Alan Smith)

    There is a local company: SRS that advertises a line of RGA QMAs starting at $3700 for a new unit.

    https://www.thinksrs.com/products/rga.html.

    I have not looked into all the details, but they may work for LENR needs. Pfeiffer…
  • jeff

    Post
    (Quote from Curbina)

    (Quote from JedRothwell)

    If one were to build a "reasonably priced" system that included <1e-7 mb vacuum system, a mass spectrometer, and a flow calorimeter, would it look like what is shown in the attachment? I am in the process of…
  • jeff

    Post
    (Quote from Alan Smith)

    Alan,

    Sigh...

    If there is sufficient interest in ordering another set of 20 let me know. I'll buy a set then.

    Jeff
  • jeff

    Post
    (Quote from JedRothwell)

    I found an interesting paper that details the reduction of NiO in H2 at different temperatures. The paper reports that both the percentage of NiO reduced, as well as the resulting surface morphology are strongly dependent on the…
  • jeff

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    (Quote from Alan Smith)

    Alan,

    Please put me down for one set of three meshes.

    Jeff
  • jeff

    Post
    A few comments regarding a fan-based flow calorimeter. The temperature delta between input and output will not be linear with respect to the power dissipated internally. As the air inside the calorimeter is heated it expands and produces a back…
  • jeff

    Post
    Regarding welding of SS: TIG welding is the preferred method. I had an exhaust system for a homebuilt aircraft fabricated of .040" wall thickness SS tube, and the results were really good. One word of caution: the welder stated that back purging is…
  • jeff

    Post
    (Quote from magicsound)

    Looks good and very well made. Several questions: What size Conflat flanges are those? Also, the Conflat nipple looks longer than the standard size. Did you have one custom fabricated? Is the sheath heater secured via a Swagelok…
  • jeff

    Like (Post)
    Prototype half-scale cell 40 x 300 mm. The heater is a 150 watt cartridge inserted in the thermowell. I'll initially assemble it without Ni mesh, for vacuum testing and bake out. The ports are both 3/8" Swagelok, welded to the end caps.



  • jeff

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    To all,

    Thanks for your inputs and suggestions.

    I found a vendor, Isowater, that sells D2O for $779 per kg. They state that the D2O is refined, so hopefully that means it is also de-ionized. Most hydrogen generators require DI water to work properly.…
  • jeff

    Post
    Wow! I have been away for only a few months and I see all this new discussion. Where to begin...
    I definitely plan on attempting a Mizuno replication, and already have most of the equipment from previous experiments. Here is a brief overview.
    1.…