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  1. TugboatEng

    Use of Gate Valve for Throttling

    What do you have to lose if the valve fails? -Does failure pose a safety hazard? -Does it pose an environmental hazard? -Is needing to repair or replace the valve an acceptable cost? -Is the loss of control of the process going to result in loss of valuable product? -Are there other components...
  2. TugboatEng

    Need help sourcing a custom-made Buna O-ring.

    The groove needs to have clearance to the o-ring or the o-ring will rupture when compressed. A dovetailed o-ring groove will allow the use of a round o-ring without glue. https://www.sealanddesign.com/technical/o-ring-groove-design/o-ring-groove-design-dovetail/ The challenge is not...
  3. TugboatEng

    Air India 787 crashes on take off

    How is circuit breaker sequencing managed on these types of aircraft? Can a dead short on a load on a distribution panel cause a magnetic trip of an upstream bus-tie breaker? Without sequencing, such a fault may trip both generator circuit breakers simultaneously.
  4. TugboatEng

    SpaceX Starship missions

    I wonder what the PM emission of a SpaceX launch are?
  5. TugboatEng

    SpaceX Starship missions

    No diesel here, only R99. I want to buy a US EPA Tier 4 final diesel engine but it's unclear if that meets "PM emissions equivalent to the combustion of natural gas with a fuel sulfur content of no more than 1 grain per 100 standard cubic foot". No engine manufacturer on the planet reports...
  6. TugboatEng

    Racing oil for historic engine

    Why cripple yourself right out of the gate with a semi-synthetic?
  7. TugboatEng

    SpaceX Starship missions

    It's not the engineering regulations that are the problem. It's the bureaucratic rules that are some combination of nonsensical, redundant, or impossible to comply with. Here is an example of one I'm working with right now, #2 and 3, how do you comply with something so vague yet so specific...
  8. TugboatEng

    Fan blade worn out

    I think this is a fan from a wheelabrader. As for a repair? The damage seems to be concentrated only in the weld. It could be rewelded, recoated, and rebalanced.
  9. TugboatEng

    Racing oil for historic engine

    If you don't believe API when they say that current API specs supercede previous specs then you can still get oils with the more classic anti-wear package (zinc) from your motorcycle dealer. For example, Honda GN4 and HP4 still meet the API SJ spec. If your engine has any value to you, run...
  10. TugboatEng

    U-bend before pump suction inlet.

    That depends on how much you trust your foot valve. That expansion joint straight up to unsupported PVC pipe is not ideal either.
  11. TugboatEng

    SpaceX Starship missions

    My daily is a made in Japan Lexus. I understand what taxes have provided. They don't provide that anymore. Now, they feed money in to the pockets of law firms to comply with regulations the very same government imposed upon itself.
  12. 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.
  13. 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.
  14. TugboatEng

    Pump modifications

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

    Air India 787 crashes on take off

    What is the ideal fail condition? Off, idle, 50% power, 80%, 100%, last valid input?
  16. 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.
  17. TugboatEng

    SpaceX Starship missions

    Yes, socialist governments can't support themselves so they must collet money where they can.
  18. 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.
  19. 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...
  20. TugboatEng

    Things are Starting to Heat Up - Part XIV

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

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