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  1. Doove117

    Bolted fastener vibration loosening and spring washers

    Thanks for the responses chaps. As you might have guessed i am after evidence against design by convention which is what i suspect this to be. I think the elephant in the room here is the assumption that there is vibration of the right frequncy and amplitude to cause jost effect loosenning. Can...
  2. Doove117

    Re-Galvanizing

    I agree completely with tbuelna. just replace. I have never tried to clean and put threaded parts back through hot dip. they will need to be spun to get correct thickness on, it's not like hot dipping a beam. You also mention the plant has only been in service for 4 months so I think your first...
  3. Doove117

    Bolted fastener vibration loosening and spring washers

    Hi we supply skid mounted process plant for marine and oil and gas sector. All 2" lines or less. Ambient temp, <10barg. Seawater with some chenical. One line has bubble entrained gas flowing to a degas tank (atmospheric). There is a small fan and a small pump on the skid. Our designers put...
  4. Doove117

    Problem with installing AutoCAD... .NET installation failure

    you are usually better searching the autodesk forums for issues like this. Try this link Link
  5. Doove117

    Importing .pat file into &quot;Mechanical 2014&quot;

    Don't think you can, but don't have 2014. You could convert the .pat to a compatible image file like jpeg or png or tiff if it's vector. then create a new material and use the image? Are you talking of .pat photoshop files? If you mean .pat autodesk hatch file (which reading your post again I...
  6. Doove117

    Hydrostatic Testing Exclusion Areas

    Not sure if already covered, but an important point is what the pipe material is, and determining what failures could occur and what the failure mechanism is. e.g. plastic pipe has a Youngs Mod orders of magnitude lower than steel, i.e. it stretches more, so stores more volume, also some types...
  7. Doove117

    Explosive Atmospheres - Static - incendive discharge - hydrogen - pipe earthing and bonding

    Thanks for the responses. Terp16, the thread links were also useful, I have emailed Erico to ask their advice. I have started to organize some of the info in my head as follows: Reasons for bonding / earthing 1. electrical safety - if a powered device faults or cable ruptures and causes...
  8. Doove117

    Explosive Atmospheres - Static - incendive discharge - hydrogen - pipe earthing and bonding

    Having some differences of opinion with a client and a supplier (...I can hear you grinning from here...) IEC 60079-14 paragraph 6.4 In the design of electrical systems, steps shall be taken to reduce to a safe level the effects of static electricity. I have 5% HCl acid line (PTFE lined...
  9. Doove117

    Galvanic Corrosion of dissimilar metals

    If you're using flanged joints then ensure the metals are electrically isolated; this is usual way. Nonconductive gaskets, nonconductive 'isolating' washers under the nuts or metal washers. No electrical contact no galvanic corrosion. Area effect can be considered (often hear the example that...
  10. Doove117

    Hertz Contact Stress in Pipe Support

    I'm no stress engineer in the slightest, but typically I would be looking to support the pipe with a saddle, or weld a bearing plate on the pipe to reinforce the contact area. Remember there may be other factors like thermal movement or vibration.
  11. Doove117

    Vibration Induced Fatigue, Small Bore Instrument Tees, Incompressible Flow

    Thanks for the response guys. The consultant has done the LOF risk calcs according to the Energy Institute guide and they have indeed come back saying these lines should be braced. As I don't really get the physical failure mechanism I'm a bit unsure about the bracing design. I had thought a...
  12. Doove117

    Vibration Induced Fatigue, Small Bore Instrument Tees, Incompressible Flow

    Hi I am a draftsman who is studying to become an engineer so please excuse my ignorance. We have a job and have subcontracted out pipe stress analysis, including an assessment to EI guide on vibration induced fatigue. It is 4" titanium pipe with a 4" to 2" reducing tee then a little downstream...

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