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  • Users: fpnut
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  1. fpnut

    Brazing of threaded joints

    How common/safe is it to braze a threaded joint? Not looking to do it, just curious since I came across a really old piping manifold (30+ years old) that was still in use. Seemed to me like an threaded valve brazed onto a block. I'm just wondering how common it is, or any pros and cons of doing...
  2. fpnut

    Interference fit for plastic parts

    I don't have experience designing plastic parts that mate together, so I'd appreciate some pointers. Basically I ordered plastic gas diffuser that will be pressed to fit, and I have made the inner diameter of the filter too loose, causing gas to leak from the mating surfaces. Both diameters I...
  3. fpnut

    Looking for gas pipe flow experiments with published results

    Hi All, I've just made a simple spreadsheet for estimating pipe diameters. Since my application is for gas, lower pressures (<30 bar), short lengths of pipe (<30 metres), relatively low pressure drop, I've opted for a simple Darcy-weisbach equation, coupled with Swamee-Jain friction factor...
  4. fpnut

    Increase fluid temperature after a throttling valve

    Hi All, I recently came across this problem, though I am not responsible for it, but found it interesting nonetheless. A chemical plant recently replaced a valve for a cryogenic liquid (ethylene). Previously they had been using a ball valve, but for some reason they chose to use a globe valve...
  5. fpnut

    Electric Actuator in Oxygen Service

    Hi, I am in the process of designing some pipelines for gaseous oxygen, and is in need of an actuated shut off ball valve. Typically I would use a pneumatic actuator for this service. However, for this application there are no compressed air or nitrogen available for actuating the ball valve...
  6. fpnut

    Strength of brazed copper tube

    Are there any ways to estimate tube/pipe material strength after brazing operation? The application I am looking may require a section of thick walled H80 copper tubing, and the joins to a brass block by brazing. I am aware that brazing basically anneals the material, causing it to have lower...
  7. fpnut

    Brass/Bronze valves on SS316L pipes on seashore

    I have used brass/bronze valves on 316L piping before, and the results have generally been good. However, this time I'll be using it onshore, next to the sea. Anybody have experience with galvanic corrosion in this case? I'll be piping nitrogen. I'm worried about the atmospheric condition. Is...
  8. fpnut

    Budget 3D Cad recommendation

    Hi Everyone, I'm looking for a budget 3d CAD that is simple enough to learn but can do assemblies and BOM generation. I mainly design piping systems, some mechanical parts and assemblies, and also some structural stuff. As a background: I don't have any experience in 3d CAD, since I never found...

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