Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. TugboatEng

    Hole size with tolerance for Shaft

    ISO 286 covers this. SKF has information on their website with regards to shaft and housing fits. You want a free running fit. Dissimilar materials and extreme temperature complicate this.
  2. TugboatEng

    FIU Bridge Update - New Bridge Has Broken Ground

    Public funds are for building the bridge. Endowments are for adding color. At least, that's how it should be.
  3. TugboatEng

    Pump modifications

    Simply throttling the discharge can reduce cavitation if you can tolerate reduced flow.
  4. TugboatEng

    Air India 787 crashes on take off

    What is the ideal fail condition? Off, idle, 50% power, 80%, 100%, last valid input?
  5. TugboatEng

    Air India 787 crashes on take off

    If a control system is using PWM to manage fuel flow it's not going to flow any fuel if power is lost.
  6. TugboatEng

    SpaceX Starship missions

    Yes, socialist governments can't support themselves so they must collet money where they can.
  7. TugboatEng

    Things are Starting to Heat Up - Part XIV

    If that's what you want, maybe Europe and Japan should bomb our railroads into oblivion and then pay us to rebuild them like we did for them.
  8. TugboatEng

    Air India 787 crashes on take off

    My truck is similar. It has two 12 volt alternators in series to power both 12 and 24 volt loads. The define alternator is isolated ground and it's negative terminal connects to the first battery position. Back to FADEC, I guess the ECM on a diesel engine is the same thing. I had an interesting...
  9. TugboatEng

    Things are Starting to Heat Up - Part XIV

    Maybe they should consult with Santa Cruz Metro before taking on such a foolish endeavor.
  10. TugboatEng

    Air India 787 crashes on take off

    On our diesel engines our alternators (permanent magnet generators or whatever) were found to not be very reliable so many of our vessels run battery chargers off the AC electrical system. That was fine in the 1990's when the battery chargers were the mag-amp or transformer based chargers...
  11. TugboatEng

    How to protect against frequent breakdown of soft starters at a water pumping station?

    From what I have seen, a conventional soft stater with a bypass relay requires an additional contactor for tripping in the event of a fault because the bypass relay can be damaged if opened while passing currents less than the motor nameplate rating. As for price, I understand that soft staters...
  12. TugboatEng

    Air India 787 crashes on take off

    Why is fuel cut so important that it needs to be the front and center most switch?
  13. TugboatEng

    Air India 787 crashes on take off

    The SR71 flight manual says that the windscreen your head impacts after an engine failure is opposite of the engine that failed. What kind of training/instruction do pilots receive to determine what engine to shut down. Why are the in such a hurry to shut the engine down ? My first question is...
  14. TugboatEng

    How to protect against frequent breakdown of soft starters at a water pumping station?

    Who buys soft staters anymore? A VFD can do everything a soft stater can and so much more. It eliminates the need for bypass relays which is the most likely failure in your soft stater from the conditions you have described. The VFD puts less stress on your grid and may reduce grid failures...
  15. TugboatEng

    Electric car ship fire.

    Ships can't rest on the bottom without sustaining massive damage. Any such vent would result in a total loss. Environmental agencies will sue to throw salt in the wound. Modern ships are designed to be able to remain upright and stable with two compartments flooded. That might mean the ship...
  16. TugboatEng

    Electric car ship fire.

    Probably best to dispose of the evidence and not make the general population aware of the environmental hazards that exist post battery fire ie the cleanup required to make the ship safe for human entry.
  17. TugboatEng

    Spain and Portugal power grid collapse | Report Released

    The frame series turbines are not aero derivative. Only the LM series are if I am not mistaken. MechinNC, the grid stability contribution necessary only needs seconds. The 3x surge has more to do with the quality/capability of the voltage regulator than the generator itself.
  18. TugboatEng

    Spain and Portugal power grid collapse | Report Released

    A GE Frame 9 turbine is capable of over 1400MW from a single generator set. The largest battery storage system in the world is 750MW and cost nearly $1 billion. The GE Frame 9 is around $450-700 million. But! A generator is capable of handling transients much higher than the nameplate. For us...
  19. TugboatEng

    Air India 787 crashes on take off

    Right away, this part of the diagram shows a spring shut valve held open by a normally closed switch. A loss of electrical power would cause an engine shutdown if this is true. It also shows two pressure sources for a shut off? This may not be the only way the FMU can cause a shutdown...
  20. TugboatEng

    Air India 787 crashes on take off

    A diesel engine can set the pump to zero delivery even while the engine is running such as during coasting. Maybe this isn't such a good idea for a turbine engine. I wonder how minimum fuel is set vs no fuel. Starving a pump for fuel isn't such a wise idea so I imagine the normal shutdown is...

Part and Inventory Search

Back
Top