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Recent content by NovaStark

  1. NovaStark

    Flange Joint Live Tightening

    If your bolts are B7 bolts, the yield is around 105 ksi at ambient conditions, so the 27 ksi is around 25% of the value. Usually, we try to go to 50-60% depending on the situation. With an RTJ gasket, you can try a slightly higher torque value however, note that the with torqueing of these...
  2. NovaStark

    Flange Joint Live Tightening

    Much like what LI says, if it isn't leaking, there wouldn't be any need to do an online tightening as that could impart more damage than benefit. Is this a known problematic joint or operates in some condition where bolt relaxation is a sigifnicant issue ? 120 degC doesn't seem like a large...
  3. NovaStark

    Skillet blind thickness for an air test

    Best to start with the code of construction for the system. If B31.1/3 or ASME VIII, there are formulas for design.
  4. NovaStark

    Tangential Radiography of 16" pipe

    This article here seems to compare a few sources: https://www.ndt.net/article/apcndt2006/papers/12.pdf If you are specifically looking for general internal corrosion/erosion patterns where the order of magnitude is important, then you'd be better off asking a radiographic testing contractor...
  5. NovaStark

    Reducing flange analysis using FEA or Div 1

    Are there any particular reasons for this ? I have my own reservations but that is just based on my specific experiences.
  6. NovaStark

    Designing Blind Flange in PV Elite 26

    If the blind you are designing has bolt holes in it and is being attached as in Fig UG-34(j)/(k), the formula that would be used is equation (2) undre UG-34(c)(2). The additional loading due to the edge moments result in a thicker flange.
  7. NovaStark

    EN1591-3:2007 : Error in the standard?

    I have done this before some years ago however I remember it to be quite intensive with respect to the formulas and the variables needed. Given that the ASME design would not take into account thermal expansion in the same manner is BS EN1591-3, I would not be surprised to find that is not 100%...
  8. NovaStark

    Two phase flow pipe support

    The reason you might not want to use them is due to two-phased flow causing a hammering effect which can cause your line to sway if there aren't any rigid type of supports. The type of supports would depend on the size and layout of your piping. So shoes, clamps, guides, etc. might be better used.
  9. NovaStark

    Very High Temperature Piping Stresses

    Much like Andrew said, at those temperatures your allowables are going be extremely low and are most likely governed by creep rupture properties. Depending on the application such as a furnace, you might need to look into even more specific alloys, e.g. S+C.
  10. NovaStark

    Steam coil material selection

    I am not familiar with UFC85 however you may need to look through your design documents to see if there is any reason why the storage tank is stainless steel and not CS. It could be that CS is severely corroded by UFC85 and thus SS was chosen. So while you might be able to use both SS and CS in...
  11. NovaStark

    Pump Efficiency limitation

    The efficiency would mainly depend on the desired flow rate. So your BEP would tend to closely match the nominal flow rate.
  12. NovaStark

    Piping leak repair with "something" that does not need surface preparation

    What fluid is leaking out here ?
  13. NovaStark

    NDT Prior to welding

    You can do liquid penetrant testing if you feel so inclined to. However, you would have to weigh if doing it makes sense in the first place to begin with or what sort of defects you are trying to see.
  14. NovaStark

    Pipe Bowing in a fired heater

    During transient scenarios is it possible that there is steam condensate collecting in the lower tubes such that they have a level of liquid in them? If they do, then the thermal bow may occur as LI was alluding to. Or alternatively, is the pressure drop along the coil causing condensation ?
  15. NovaStark

    Vibration spectrum analysis

    Where your peaks are most likely the gear mesh frequencies. Around the main peak, you can check to see if you have sidebands that match the running speed of either the input/output gear. Comparing to previous measurements may help you to determine if there is increased wear. As...
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