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  1. LittleInch

    Difference Between Cladding & Overlay

    In general I would say cladding is taking a sheet or pipe of one material and bonding it to another, by pressing, sleeving etc. For pipes it can be mechanical expansion, thermal effects or similar. Overlay for me is by deposition of one material onto another by welding, spraying or similar...
  2. LittleInch

    Helicopter crash Hudson River

    I'm with xr250 and have been for a while. I'm not actually sure if anyone is going to be able to determine cause from effect from such rapid and violent set of events. Unless they've got better footage from somewhere or can take the gearbox apart slowly to see what might have happened, I think...
  3. LittleInch

    Thick Walled Cylinder Question

    Use mid wall? Expansion from pressure is dwarfed by thermal effects in PE.
  4. LittleInch

    Max allowable pressure drop for control triple eccentric butterfly valves

    Ask the vendor is your only way.
  5. LittleInch

    Tri-clamp unit

    A 12" flat plate and only 4 bolts?? Good luck with getting that to seal at 6 bar.... You really need to think about this better and go buy a proper quick opening enclosure. Or use a flange designed to a flange code like B 16.5 IMHO.
  6. LittleInch

    Pipe Clamp Coefficient of Friction

    Your problem is essentially that these things are not supposed to be analysed using Ceasar. Three inch pipe is pretty big for something really designed for one inch tubing. Is really only the end fittings which are an issue as Ali the others the thermal forces cancel each other out. The...
  7. LittleInch

    Helicopter crash Hudson River

    The helicopter goes sideways at over 100 knots for reasons they might never work out in less than one second so not a lot of surprise the tail snapped.
  8. LittleInch

    Entrainment rate of wind over the top of a stack

    If you stick those whirly things up there at least you have some kinetic energy involved. Anything else is so temperature dependant it would work one day and have cold air coming down the vent the next day. IMHO.
  9. LittleInch

    Pipe Clamp Coefficient of Friction

    CoF will be a lot higher than 0.3. It's. It's basically a set of anchors/line stops 5 feet apart if you follow the recommendations. How you work out the clamp force though I have no idea.
  10. LittleInch

    Internal Diesel Storage Tank dimensions

    Just allow 5% less volume from external dimensions and you'll be fine.
  11. LittleInch

    Helicopter crash Hudson River

    Going to be difficult to know what happened first, but looking at the tail damage and then at the right hand blade on post 27, that has all the look of a tail strike with the tip of the blade missing compared to the other blad, kind of matching the damage. Now that might / may not be the root...
  12. LittleInch

    Looking for the name of a material

    It looks more like "cotton stockinette roll" to me or something very similar if you want identical stuff. Does it feel like cotton?
  13. LittleInch

    NFPA 20 - Check valve on fuel return line

    As noted by others I think this depends on the location of the fuel tank relative to the engine. Above it and the return line is below the fuel level, then they fit it, below, they probably don't.
  14. LittleInch

    Entrainment rate of wind over the top of a stack

    I'm not convinced it is as simple as this. As soon as you get any air coming out of the stack it will disrupt the air flow horizontally creating turbulence and changing the pressure. At the sort of velocities you mention up the stack you will also have entry and exit losses which need to be...
  15. LittleInch

    Helicopter crash Hudson River

    The B roll from the NTSB is here https://www.ntsb.gov/investigations/Pages/ERA25MA171.aspx First bit looks the most interesting but also that the chair of the NTSB is there as well. I'm very impressed with her whenever I hear her speak to the press. The tail looks like it sheared off a the...
  16. LittleInch

    Max allowable pressure drop for control triple eccentric butterfly valves

    So you mean is there anything which states the maximum differential pressure across a butterfly valve is 3 bar? This is vendor supplied data. There is no "standard" I am aware of which states this, nor should there be. Try another vendor if you want higher than 3 bar.
  17. LittleInch

    Air valve on falling main

    A couple of things. Calculations and predictions are not that accurate. Most err on the side of caution so your actual pressure drop from friction could easily be less than predicted. So your margins are very tight. Any time you fall below atmospheric pressure at any point you are in danger...
  18. LittleInch

    Tank Vents - Plastic Bags - Pressure events ? (even possible)

    I would say its absolutely possible. The question is then how possible? If you have material which can turn solid then the probability increases. If you have bird or insect mesh the probability increases. If you have any sort of pressure valve and not a free vent the probability increases...
  19. LittleInch

    IFR air raise calcs

    Is that 15 thousand lbs or 157 thousand lbs. If this is steel then I got a thickness of less than 1mm?? Something really isn't right here.
  20. LittleInch

    Blue Origin space tourism

    The real truth?

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