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  • overspeed passed

    Discussion in 'The Leisure Lounge' started by tonycro, Dec 3, 2011.

    1. tonycro

      tonycro Well-Known Member

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      doesn't matter how many I overseen, I HATE over-speed tests ! I know it will be ok because my designs are not that close to the limit.

      but still I was as nervous as a kitten today as my rotor sat at 3600rpm for its two minutes - and too make my blood pressure higher, client witnessed test as well

      now a beer, and rest before electrical testing tomorrow :eek:

      hope your weekend passes with a little less stress :cool:

      tony
       
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    3. mvalenti

      mvalenti Well-Known Member

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      try designing high pressure vessels (10,000-150,000psi) and have to hydrotest 1.5x the design pressure......
       
    4. tonycro

      tonycro Well-Known Member

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      aye that's a worry. But I might be able to raise the stakes !

      This;

      [​IMG]

      is an 11kV stator for a 4MW induction motor, and yes that water being sprayed over it whilst we do a final HV test - I can't rememeber the level now, might only of been 11kV rather the full 23kV final HV test.








      actually, no I think you win - mine fails it just goes 'thut' your fails and you're picking up scrap for a few weeks and re-building the yard!

      These are harder, and more stressful (pardon the pun), jobs than the general public would guess!



      tony
       
    5. GarethW

      GarethW Chief Clicker Staff Member

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      WOW! That's one serious peice of kit. So where do these things get used?
       
    6. tonycro

      tonycro Well-Known Member

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      this one is for an 1500rpm 5MW induction motor at Esso Fawley, and drive's a compressor.

      big toys, mind you - my dinky 22MW rotor in the balance pit looked pretty small - the pit can take something 300tonnes and 30m long - for reference mine is 12tonnes and only 4m long.

      its all relative thought, just a question of how far the bits go :)
       
    7. Dana

      Dana Well-Known Member

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      Reminds me of when I was designing aviation ground support... handling carts and related items for bombs, missiles, and such. Had to load the equipment up to 2X its design capacity (we used four solid steel bars, 10" diameter by about 7' long, as the test load for the same diameter 1000# missiles) and drive it around a specially designed bumpy test track. The poor co-op engineering student who ran the test had to tie himself into the seat of the tow tractor to keep from being thrown out, but the equipment survived.
       
    8. tonycro

      tonycro Well-Known Member

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      lol - hope its on you-tube somewhere :)


      FWIW - my rotor passed it final witness HV test last week :cool:
       
    9. Dana

      Dana Well-Known Member

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      'fraid not... this was around 1984. Times have changed...
       
    10. tonycro

      tonycro Well-Known Member

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      true - what did we do before the internet and smart phones !
       

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