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  • Users: hydrae
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  1. hydrae

    short term spikes in the output

    Got a problem I haven't seen before, got these spikes in the output of a submersible pressure transducer These spikes occur at random times about once a day or so This is measuring level in a water tank Tank is 24 ft tall The reading ignoring the spikes is cycling between 18 and 20 ft...
  2. hydrae

    Low maintenance engine

    Over the course of my lifetime I have seen engine oils drop in viscosity, 30 – 50 wt many decades ago to 0-20 or even lower in some of the new cars. I have also seen better cooling of engines. You do not see overheated cars and trucks on the side of the road as often. While the volumes of...
  3. hydrae

    AutoCAD LT Help Screen is acting weird

    Just upgraded to 2016 from 2007 AutoCAD LT which means new lap top and windows 8 (Dell M4800) Forced to do so as XP goes bye bye got a weird thing on the help screen the top portion (about an inch) of every page is hidden above the window bar and the cursor highlights things about one inch...
  4. hydrae

    Francis or Kaplan Water Turbines

    Does anyone have a list of the manufacturers of small Francis or Kaplan turbines 20 to 200 kW? Hydrae
  5. hydrae

    A thought on efficiency

    A thought on energy efficiency: There are quite a few houses that are heated with natural gas, right now if the furnace is brand new it is 90% efficient, older 70%. Is there an engine out there that is very quiet, extremely reliable such that it could run a 50% duty cycle for year between...
  6. hydrae

    Geometric Condition

    Anyone know what a geometric condition is " your extrusion/revolve/cut ect failed due to a geometric condition Hydrae
  7. hydrae

    ASD on a generator

    Hi, I do not normally visit here, seeking your help My client has a well pump that has been operating fine for the past year. 150 hp submersible, powered via an pulse width modulated ASD, includes load reactors due to the distance between the drive and the motor, We added a 230 kW minimum...

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