Jimmy Beginner

  • Member since Apr 8th 2017
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  • Jimmy

    Post
    (Quote from Alan Smith)

    They would want to be quite the wizard, there is nothing plugged into the external control terminals in the picture you recently uploaded!

    I would also expect that any input signal would be still be limited so that you don't…
  • Jimmy

    Post
    (Quote from Alan Fletcher)

    Ouch, could you just put the dye in the collection cylinder, thought it didn't feed back yet?
  • Jimmy

    Post
    (Quote from randombit0)

    Your modus operandi is really showing up on this thread, you are fooling no-one.

    Pumped systems are not conservative, there are frictional and hydrodynamic losses abound. Obviously there will be a pressure difference across a…
  • Jimmy

    Like (Post)
    (Quote from Bruce__H)


    Well if you operate these pumps under enough reverse pressure it will no doubt push water through the cylinder destroying whatever valves there are. In that case the flow rate would be determined not by the pump but by the negative…
  • Jimmy

    Post
    (Quote from randombit0)

    It is running at max spacing and rate, do you expect a higher flow rate otherwise?

    These pumps are not complicated, do you think changing some of the pipe fitting is going to substantially increase the flow rate? By how much and…
  • Jimmy

    Post
    (Quote from Alan Fletcher)

    For point 4 you could do a quick back-of-envelope for other head losses (http://my.me.queensu.ca/People…ellens/LossesinPipes.html), but I would be surprised if they caused that kind of difference.
  • Jimmy

    Like (Post)
    No reply from Prominent ... but I have the pump in hand. (Fedex didn't even come to the door ... big, friendly dog in the yard, so they dropped it over the fence) ... but it was very well packed.

    Looks like it's in much better shape than the ebay pics…
  • Jimmy

    Post
    (Quote from IH Fanboy)

    Thanks, having read the report I'm now more sympathetic to Smith, there was no indication of system back pressure so completely reasonable to go with the 2 bar in the pump as a first guess.
  • Jimmy

    Post
    (Quote from IH Fanboy)

    It is a bit weird, 'minimum guaranteed' would be clearer phrasing but for this type of pump you don't expect the flow rate to be much above this value. In fact there is no physical way it can be.

    I think Smith taking 32l/h off the…
  • Jimmy

    Post
    (Quote from IH Fanboy)

    Not exactly, Penon's numbers range from 517 to 896 kW with a typical value of 846 according to your numbers above. These a bigger than Smiths calcs by factors of 1.48, 1.76 and 1.86 respectively and flow rates of 47, 56 , 59.5 l/h.…
  • Jimmy

    Post
    (Quote from Alan Fletcher)

    You've probably got it, put make sure that the funnel tubing is sized so that it doesn't just fill up and overflow. It is probably better to not put the tubing from the funnel under the water level in the output tank. If you…
  • Jimmy

    Post
    Nice idea.

    I haven't looked at pumps since college, but some thoughts for what they're worth...

    This is a solenoid pump, they are designed for reproducible flow rates over large pressure ranges. I think Rossi is purposely making a big deal of the…
  • Jimmy

    Replied to the thread The Playground.
    Post
    (Quote from SSC)

    This is a nice start, but I don't see evidence that 1) Cherokee built these buildings, 2) they were houses, 3) people lived in them, 4) people got sick. In case you accuse me of moving goalposts, look at my sentence you've just quoted,…