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Recent content by schlebb

  1. schlebb

    heat transfer for molten wax

    Thanks. This really helps. I hadn't thought about the possibility of freezing at the boudaries of the heat exchanger at lower temperatures. We are trying to cool the wax just before it is dispensed into small containers (approximately 3 gallons). Currently, there is a long wait time for...
  2. schlebb

    heat transfer for molten wax

    We want to cool liquid paraffin wax from about 155F to about 125F. It will have a viscosity of around 15 cst. We will be using a heat exchanger with a fan. I can't find any information on the heat transfer properties of wax so I can size the cooler. Normally, my calculations are for water or...
  3. schlebb

    Hydraulic Cylinder Codes

    Although it is not a bad idea to design cylinders to the ASME Code, strictly speaking these are not pressure vessels. If they are used for hydraulic purposes they are exempt from the code. Most cylinder manufacturers build to the standards published by the National Fluid Power Association. You...
  4. schlebb

    Variable displacement pump, accumulator and Rotary actuator

    There is free software available which can be used to size/simulate the accumulator function. It will also deal with the changes in temperature due to cycling. It is available to download at www.Hydac.com. If you need help with this, please call me at 1-905-714-9322 x2244.
  5. schlebb

    Thread length per UG34(q)

    Someone has suggested that the length of thread shown in Sect.VIII Div 1, UG34(q), must be as long as the calculated thickness of the end cap. This is based upon the sketch (q). My argument is that sketch (n) shows a retaining ring with a thread length less than the thickness of the end cap...
  6. schlebb

    G Thread?

    English Muffin: I agree. The "G" designation is used to denote a BSPP (British Standard Pipe Parallel) thread. This is described in the Machinery's Handbook. The tapered version is rather uncommon in Europe, and when used, is shown as a BSPT thread. If a BSP thread is shown, it is...
  7. schlebb

    Machining Hastalloy

    I have good success machining Hastalloy castings using "Whisker" ceramic inserts. Depth of cut was very small, but speeds were high, and the surface finish was very good. There are, or course, different classes of Hastalloy and you will have to talk to your tooling supplier to see if...
  8. schlebb

    What does "BSP" mean when discussing connections?

    We find in the hydraulics industry, that when someone refers to BSP thread, they usually mean BSPP (British Standard Parallel) This is a parallel thread that seals with a flat washer. The British standard also includes a tapered thread. The Machinery's Handbook describes this. Regards, Schlebb
  9. schlebb

    Filter Pressure Rating

    I don't know your filter data, but the delta P is the differential pressure value at which the element is clogged sufficently to require changeout. This does not guarantee that the filter element will actually be changed. A filter may have a by-pass which will allow unfiltered fluid past the...
  10. schlebb

    Filtration

    The effciency of an absolute rated filter is directly related to the Beta ratio. Beta ratios are given for specific micron ratings. For example, a B10 = 200 means that a filter has a Beta ratio of 200 for a 10 micron size. a B5 = 200 would have Beta ratio of 200 for a 5 micron size. The...
  11. schlebb

    CONTINUOUS RAIL EXPANSION

    Hi guys: I went to school in Germany, and was fascinated by the fact that railway rails did not have any expansion joints! The explanation from my professor - they are laid in a very gentle "S" curve. Thus, the S - shape is shortened and elongated with temperature variations. ---...
  12. schlebb

    Water Glycol particle counter

    Does anyone know of a particle counter that can be used to measure contamination in Water Glycol and perhaps print out an ISO contamination code (4/6/14)? [ponder]
  13. schlebb

    ASME B31.3 intra-extrados

    Thanks: If I understood you correctly, then I calculate the minimum wall thickness as shown in 304.1.2. Then I use 304.2.1 to determine the acceptable wall thickness in the bend. This means that the wall thickness at the outside of the bend could be less than the thickness calculated for a...
  14. schlebb

    ASME B31.3 intra-extrados

    In calculating the required wall thickness of a straight pipe I use the formula in section 304.1.2. This is quite straight forward. My problem is in understanding section 304.2.1. Can anyone explain to me what I am calculating when I use the formula 3c? It is supposed to be the minimum wall...
  15. schlebb

    surface finish

    See response in ANSI
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