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  1. T

    gauge pressure

    Good day, Gauge pressure measures static pressure component of Bernoulli equation. Say l put gauge pressure between point 1 and 2, assuming minor head loss due pipe length, the 2 gauges will read differently due to potential energy difference and also due pipe diameter. See attached. l am...
  2. T

    hydraulic grade line

    Good day guys. l finally got around it: lf there were no valve, the hydraulic grade line would drop at the peak below the pipe line profile and join the dotted line, where the all the flow will rush and flow becomes packed again due to pipeline leveling up. But from the peak to the dotted line...
  3. T

    hydraulic grade line

    Again my confusion is, l know to prevent slack flow, the hydraulic grade line should clear the pipe profile incase of packed flow. But for slack flow, how would l know if there is enough back pressure to prevent slack flow by just looking at the hydraulic grade line graph?
  4. T

    hydraulic grade line

    My problem was the dotted line, but some have answered me on that.
  5. T

    hydraulic grade line

    true, the dashed line confused me too. lts a piping handbook, see attached
  6. T

    hydraulic grade line

    thank you sir
  7. T

    hydraulic grade line

    Thank you for available information. Does is it mean the dashed lined is hydraulic pressure curve for open channel flow?
  8. T

    hydraulic grade line

    its a conduit/pipe with slack flow.
  9. T

    hydraulic grade line

    Ok noted, thank you
  10. T

    hydraulic grade line

    Good day, l have a hydraulic grade line, but l dont understand why it deeps down where there a valve, but pressure loss in a valve in not that much.
  11. T

    Flow inconsistence

    thats correct, the pumps are being repurposed. So by the fact that the pump operating at very high head and low flow, it means we would need a pump with a higher head?
  12. T

    Flow inconsistence

    Lets assume l am pumping water, that comes to a pump at 1000kg/h and the pump adds a pressure of 5bars, hence leaving a pump at 6bars and 1000kg/h. l then added a valve on the simulation to simulate system pressure drop on COCO simulation. On stream 3, only pressure decreased, but mass flowrate...
  13. T

    Flow inconsistence

    its a centrifugal pump, and the discharge valve is fully open
  14. T

    Flow inconsistence

    Assuming l pump a volume of 2m3/h from a pump, l expect that to be constant in system through continuity equation. Only pressure should drop due to frictional losses.
  15. T

    Flow inconsistence

    yes we use a flowmeter dedicated to our product, soybean oil corrected for S.G. and viscosity at given temperature
  16. T

    Flow inconsistence

    l have a pump rated at 4m3/h and 35m head. lt pumps edible oil through an economizer and the to dearator with some nozzles. From the dearator there is another pump feeding a vessel (rated 9m3/h and 40m head) and there is a flowmeter reading 1800L/h (1.8m3/h). Some how the dearator gets empty or...
  17. T

    pumps

    l have a pump rated at 4m3/h and 35m head. lt pumps edible oil through an economizer and the to dearator with some nozzles. From the dearator there is another pump feeding a vessel (rated 9m3/h and 40m head) and there is a flowmeter reading 1800L/h (1.8m3/h). Some how the dearator gets empty or...
  18. T

    pumps with different kw rating

    oh unbelievable indeed, l replied with confusion, my bad. rpm= frequency×120/number of poles, technically 4 poles cant have 3000rpm. l guess some pumps are meant to be run on 2 poles only motors.
  19. T

    pumps with different kw rating

    Ok thank you all for your valuable information, and l was just moving around the plant and l made an observation on the pumps. And l dont want to change anything, l was just observing that almost all motors are 2 pole (3000rpm) and just out of curiosity l was wondering what will happen if l use...
  20. T

    pumps with different kw rating

    So for the 2 motors, if l place a flowmeter and a pressure gauge downstrean the pump; volumetric flowrate will be the same, but gauge pressure different. More for a pump with higher horsepower?

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