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Recent content by snoopnoon

  1. snoopnoon

    Campbell diagrams are over rated ?

    As a ST Engineer, in my opinion, they are required. Campbell diagrams at least allow you to know the frequency of the blades. If designing around the operation speed is unavoidable, then the buckets need to be robust enough to operate in resonance. Here they become critical, as you want to know...
  2. snoopnoon

    Determination of Balancing Speed for Flexible Body

    How do you prove out overspeed if you didnt balance up to at least rated speed? And that is not a correct blanket statement on aviation balance facility only to 8 kRPM. Even our relatively larger "small" steam turbines can run upwards of 13kRPM on Ammonia or Ethelyne compressor trains and we...
  3. snoopnoon

    mixing up two blade manufactures in steam

    By feathering, I am going to assume you mean there are radial grooves cut into the blade for moisture control along the edge of the vane. LP blades are the most critical blades when it comes to vibration and is where 95% of the R&D money is spent trying to optimize and provide a safe working...
  4. snoopnoon

    steam turbine vibration

    Not sure how you expect a meaningful response when you have not provided any meaningful information. So how about some questions to get you started: - Where is your vibration? At speed, half speed, 40% speed .... - What is a "the amplitude valve"? Assume you mean inlet control valve? - Are you...
  5. snoopnoon

    Generator Nameplate

    What is the Generator S/N? I just asked Generator Engr and said that it is Exciter Field Amps Volts Full Load going to double check on the R because typical nomenclature is IFFL (amps field full load) or VFFL (volts field full load) R is usually resistance
  6. snoopnoon

    PTFE coating repair for existing pressure vessel

    your next best bet is probably POR-15 or similar, but not a permanent solution.
  7. snoopnoon

    PTFE coating repair for existing pressure vessel

    My experience may not be much help. But on one of our installed steam turbine oil tanks that was being retrofitted with filters, the concern was the coating on the inside of the tank after welding the new inlet/outlet pipes. Ultimately it was a choice between doing the entire tank over (not an...
  8. snoopnoon

    Steam state (p,T) between nozzle and impulse turbine wheel

    Just ASSUMING here is that you have multiple packing with intermediate pressure between and not just a single shot like you shown of P1 down to Atmosphere. Pleakoff for a multistage turbine is tapped at a following stage to control the pressure and limit the amount of leakage flow. I havn't...
  9. snoopnoon

    Steam state (p,T) between nozzle and impulse turbine wheel

    The pressure and also BTU/lb at the red spot can be approximated with little error as P1. The P1 pressure will fill that entire cavity between the exit edge of nozzle and the rotor shaft with negligible variation for your purposes. The flow will be determined by P1 / Pleakoff (assuming it goes...
  10. snoopnoon

    Steam state (p,T) between nozzle and impulse turbine wheel

    Bring it back to basics... you will not get your accuracy your looking for to get leakage flow at any high probability without CFD or years of model coorilation. Assume its an ideal nozzle (100% throttling device). The all of the energy for that particular stage will be converted to kinetic...
  11. snoopnoon

    Steam state (p,T) between nozzle and impulse turbine wheel

    First - how accurate do you need to be? on a typical impulse stage you can approximate that the nozzle is doing all the work and it takes all the pressure drop. This will help you. A curtis wheel is basically a single stage turbine except that the power needed to be split over two buckets...
  12. snoopnoon

    Design of extraction and Induction STG

    if they are controlled pressures you have the added expense of the hardware i.e. the valve gear components, operating cylinders, relays, etc that go with each extraction/induction. Then there is the additional engineering involved in a customer solution. There are control systems out there that...
  13. snoopnoon

    Calculate the Theoretical Minimum Steam Flow to a Condensing Steam Turbine

    The typical issue with running min condensing steam is the temperature is much higher in the later stages. Depending of your design, but if your bearing is integral to the exhaust casing inside of the exhaust cone, the increase in temperature will cause the LP end of the rotor to lift and cause...
  14. snoopnoon

    FM Frequency Shift

    How would i know what to clip or where to add the diode without the schematic? I could not find an example that was not for automotive application to work off the 12VDC.
  15. snoopnoon

    Torque and power quiz

    There are always people who will talk about how a vehicle without a lot of torque output will be slow, without any reference to horsepower; or, people will compare two vehicles of the same power output where one has more torque output, and assume that the one with more torque will be faster...
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