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  1. Discreet544

    Problem with pressure transmitter readings on a vertical slurry pipeline

    Absolutely! The pipeline is 25 m long and 50 mm in diameter. The vertical section is 2.4 m long and the transmitter impulse lines are connected to pipe over a distance of 40 cm (the length the pressure is measured over). The sand D50 is 500 micro meter and slurry concentration is 5% volumetric...
  2. Discreet544

    Problem with pressure transmitter readings on a vertical slurry pipeline

    Hello Folks; I am pumping sand-water mixtures in a vertical pipeline. I assume I ve considered all the design parameters. I use a Fuji differential pressure transmitter (0-6 kPa) on a closed loop comprised of vertical and horizontal test sections. Now the transmitter is mounted on the vertical...
  3. Discreet544

    How to measure/estimate motor power output ?

    Thanks mikekilroy; I assume you mean the type of liquid, then it is pure water now. But the main objective is measuring power consumption while pumping pulp slurry. You are right ! I think I got mixed Full RPM with Full Load ! Then I correct my self: "I can measure the input power at full...
  4. Discreet544

    How to measure/estimate motor power output ?

    Thanks ScottyUK; I know about (Torque * RPM = PowerOut). However it s not financially possible to go for it right now. That s why I wonder if there is any approach to estimate the efficiency variation as RPM changes.
  5. Discreet544

    How to measure/estimate motor power output ?

    Hi Folks; I am measuring the output power of an electric motor (10 HP, 0.85 P.F., 1765 RPM, 60 Hz, 91.7 Nom FL. Efficieny). Using a watt transducer, I can measure the input power, and while operating in full load efficiency, I can get the full load output power at rated RPM. However, I also...
  6. Discreet544

    Developing Pump Performance Curves

    Yes TD2K ! I am trying to develop Head vs. Flow Rate !
  7. Discreet544

    Developing Pump Performance Curves

    Hi; My mistake ! After analyzing the results, I found even it did not work for pure water. So, forgetting about the slurry, here is the basic question: What is the standard procedure to develop a pump performance curve ? I looked for in several pump handbooks, while I couldn't find anything...
  8. Discreet544

    Developing Pump Performance Curves

    Hi Folks; I am developing a series of pump performance curves for pulp slurries. I am running a closed-loop Lab-Scale pipeline facility. My question is about measuring head vs. flow rate at constant RPMs. I did it for pure water by continuously feeding the system with water, and gradually...
  9. Discreet544

    Problem with pressure in pipeline

    @TD2K : I compare the pressure at certain velocities. By the way, both the density and viscosity decrease by increasing temperature of water. @ Morten: Yes, this is a 46m length closed-loop pipeline.
  10. Discreet544

    Problem with pressure in pipeline

    Hi Folks; As we all knew, and I used to experimentally observe it, as the temperature of water increases, pressure drop through pipeline (kPa/m) decreases. Now, I am getting the opposite, while the results are so consistent and reproducible !!! As the water temperature increases, pressure drop...
  11. Discreet544

    Velocity Variation through Pipeline

    Dear zdas04. Thanks for your comments. By the way, this ""school project"" is being conducted by Alberta Agriculture Ministry !! The problem is not only with water. As I already stated, I am using water just to run and calibrate the system. The major problem is with slurry. Unfortunately, for...
  12. Discreet544

    Velocity Variation through Pipeline

    btrueblood: You can look at ISO-5160 for estimates of the velocity effect (at least as measured by a square-edged orifice) for elbows in terms of the length of pipe to allow same to "settle". I have more than 35D entrance length, so the flow is already fully developed. jmw: If you just refer...
  13. Discreet544

    Velocity Variation through Pipeline

    Thanks btrueblood Could you please send me a link of ISO-5160. I can't find it anywhere. Searching also results in cabinet related topics ! That can be really helpful. Thanks;
  14. Discreet544

    Velocity Variation through Pipeline

    Hi Imagine there is a closed-loop pipeline which we are pumping pure water. Reasonably, we expect the pressure-drop to increase towards the end, due to friction and minor losses. My question, however, is about the velocity. When you half the length of the loop, at the same pump power...

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