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  1. BobMaron

    Electromagmetic flowmeters and effect of 'sand bed'

    What would be the effect of a solids bed in the bottom of a horizontally mounted electromagmetic flowmeter. The slurry is iron ore concentrate, and the height of the solids bed can be up to 20% of the pipe ID. Some people have said that the mag meter will 'compensate' for the solids bed, and not...
  2. BobMaron

    Weir-in-a-box: Keeps pipe full, but can it measure flowrate?

    Roy, your comments are right on. This is iron ore slurry in a concentrator plant. We also think sanding is a real possibility. The upstream meter is a sonar-type meter. It's relatively new technology in mining; about 5 years old. See www.cidra.com for more info. Anyway, we're going to check for...
  3. BobMaron

    Weir-in-a-box: Keeps pipe full, but can it measure flowrate?

    Keith, I don't think it's working as a siphon, based on piping and box geometry. Regarding accuracy, since the plant's estimated flowrate is ~1/2 the flowmeter value, then accuracy of ~10% or so would be quite acceptable. That relatively low accuracy requirement is why I think this Weir-in-a-box...
  4. BobMaron

    Weir-in-a-box: Keeps pipe full, but can it measure flowrate?

    Thanks for the reply Roy. The reason for this device is to keep the upstream pipe 100% full so a flowmeter can make a proper measurement. To help keep the pipe full, just upstream of the 'box' there is also a 45 degree upward bend (about 2-4 diameters of vertical rise) to further insure...
  5. BobMaron

    Weir-in-a-box: Keeps pipe full, but can it measure flowrate?

    I've encountered an application where a customer used a large 'box' with an internal Weir to insure that the upstream pipe is always full. The pipe is 12" diameter, and the 'box' is around 1x1x1 meters in outside dimension. The internal Weir divides the box in half and is about 3/4 of the...
  6. BobMaron

    using non-dimentional pump curves to detect wear

    Thanks 'BigInch'. There is a pump speed sensor installed which makes it possible to non-dimensionalize and thus produce one non-dimensionalized pump curve that is speed independant. Do you agree? Have you seen this used in practice?
  7. BobMaron

    using non-dimentional pump curves to detect wear

    Thanks Mike. As you point out, flowmeter and pressure transducer are installed, in addition to pump speed sensor which permits non-dimensionalizing based on pump speed (variable) and impeller diamter (obviously a constant). And on line density measurment accounts for change in that variable. So...
  8. BobMaron

    using non-dimentional pump curves to detect wear

    Does anyone have experience detecting pump wear by looking for changes in non-dimentional pump curves (H-Q) produced from field data on variable speed pumps? I'm thinking of comparing a curve from a new as-installed pump, with one taken at a later time on the same pump

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