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  1. BCpowertrain

    Starting Torque - Positive Displacement Pump

    Ok, I am in complete agreement with everyone on the bypass valve / recirc loop / soft start comments - but they are not applicable to this application. I have a real (i.e. existing and in widespread use) situation here where a PD pump must be started under high load and I need to determine the...
  2. BCpowertrain

    Starting Torque - Positive Displacement Pump

    Correction factor for quintuplex pump anyone? Last bit of info I need to finish my analysis. Thanks for your help Eng-Tips!
  3. BCpowertrain

    Starting Torque - Positive Displacement Pump

    Curtis, Thanks for the comments. This application will be starting from zero pump speed, with the pump directly connected to a high pressure manifold. I understand the comments regarding releif valves, re-circ valves, soft start, etc etc - but that is not the application here. Micalbrch - I...
  4. BCpowertrain

    Starting Torque - Positive Displacement Pump

    Micalbrch - thanks for your quick response. Do you know what the correction factor is for a quintuplex pump as well?
  5. BCpowertrain

    Starting Torque - Positive Displacement Pump

    Hello, I am looking for some help in determining the torque required to start a positive displacement reciprocating pump which has its' discharge connected to a manifold under pressure. The pump in question would either be a triplex or quintuplex piston pump, with known plunger size and...
  6. BCpowertrain

    Nitriding splined section of Carburized Shaft

    Yes - carburize only the gear tooth section of the part, with the rest of the item masked. And then dip the splined end to achieve the liquid nitriding. I could see how this would work if there was sufficient distance between the gear and the spline - but in this current situation they are...
  7. BCpowertrain

    Nitriding splined section of Carburized Shaft

    Thanks for the responses everyone, this is what I was expecting would be the outcome of the nitriding after carburizing but was unable to get a solid answer anywhere. With a two step carburizing procedure, what procedures, processes or design features can be used to minimize the distortion. We...
  8. BCpowertrain

    Nitriding splined section of Carburized Shaft

    When dealing with integral pinion shafts with splined trasmission elements (e.g. integral pinion for a gearbox high speed shaft with a splined input connection - think input gear for an automotive manual transmission) I have noticed there seems to be a trade-off of what is commonly done for the...

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