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  1. thrusterpump

    Rotordynamics software

    We use a software package called Dyrobes by Rodyn http://www.rodyn.com/
  2. thrusterpump

    3 lobe offset/preloaded journal bearings, who can make?

    Anyone know of any manufacturers that will custom make 3 lobe journal bearings with specific offsets and preloads for approx 1.13" id bearing by 3" long? Any tips would be greatly appreciated.
  3. thrusterpump

    Current loop wiring of pressure transmitter, controller and valve

    Newbie to the 4-20mA current loops so I'm wondering if anyone can help me with understanding how to connect the following devices. The individual product info has confused me so I'm hoping you experts can give me a clue: 1.) Rosemount 3051 pressure transmitter 2.) Honeywell UDC2500 controller...
  4. thrusterpump

    Fisher V200 V-Port Ball Valve Substitute?

    Thanks for the feedback all. Joesteam, think I can contact you and get some help?
  5. thrusterpump

    Fisher V200 V-Port Ball Valve Substitute?

    I've have selected a 1" and 3" Fisher V-Port Ball Valve 600#, with pneumatic actuation and 4-20ma positioner. My local distributor is lacking in customer service and timeliness in answering questions, to the point that I'd like to know if anyone knows of a suitable equivalent valve from a...
  6. thrusterpump

    Valve controller selection

    Thanks again to everyone who responded. Roy, do you have any specific controller references. We are using Rosemount 3051 dP transmitters
  7. thrusterpump

    Valve controller selection

    Valves are 1.5" and 4" v-port ball valves with positioners. Control is not required to be fast but accuracy would be nice, or at least accurate enough to set a flow rate (gpm) based on what is read from a differential pressure transmitter. We want to be able to set say 900 gpm on the 4" line by...
  8. thrusterpump

    Valve controller selection

    Yes, thanks for the tip. For reference, any other brands or types, maybe with more features? This is a good start, thanks again
  9. thrusterpump

    Valve controller selection

    I need to select a device to control a pneumatic valve using the 4-20mA input on the actuator. The control must be manual, by that I mean the user will vary the 4-20mA current to set the valve in the desired position by whatever means the device allows. We would prefer that the control allow for...
  10. thrusterpump

    4-20mA input to pneumatic valve, what is recommended.

    Thanks, I'll try posting in the forum mentioned.
  11. thrusterpump

    4-20mA input to pneumatic valve, what is recommended.

    I need to select a device to control a pneumatic valve using the 4-20mA input on the actuator. The control must be manual, by that I mean the user will vary the 4-20mA current to set the valve in the desired position by whatever means the device allows. We would prefer that the control allow for...
  12. thrusterpump

    valve differential pressure?

    we want to control the flow rate from 90-1200 gpm for controlling the rate at which the resevoir fills. Pneumatic actuation is prefered. I have noticed 5" butterfly valves are less common.
  13. thrusterpump

    valve differential pressure?

    Thank you all for the input. The following is some more application info as I continue to search for a suitable valve: Pump s/o pressure = 1200 psi Clean water @ 70F 5" nominal pipe through 5" venturi Subject valve discharging to atmosphere through 2'length pipe. Ideal valve would have no...
  14. thrusterpump

    valve differential pressure?

    Hi folks, I need to size a valve that will have a short pipe downstream of the valve discharging to an open resevoir and I need to provide the max. differential pressure. Is this dP just the upstream pressure-atmospheric pressure? Please correct me if I'm wrong and thanks in advance.
  15. thrusterpump

    Keyed shaft coupling

    rb1957, ok lets say i know the torque, how do you evaluate the stress with the method you know for the crosssection i described earlier. For however you plan to input the torque value, essentially that is the value I would like to solve. I work for the OEM, and there is no design documentation...
  16. thrusterpump

    Keyed shaft coupling

    Thanks for the reply, by all the way through I meant thru the length of the coupler, not through all the way to the O.D of the coupler. Sorry, probably should have been clearer. So this is a keyway. However, the case rb1957 presents has been defined by references and I guess would be the worst...
  17. thrusterpump

    Keyed shaft coupling

    I'm evaluating the torque rating of a rigid keyed shaft coupling. Various references I have omit the case of a hollow "tube" with the keyway cut all the way through for evaluating the stresses. Can anyone shed some light on how to account for the keyway? Thanks in advance
  18. thrusterpump

    Does reduced speed testing have an effect?

    Artisi is correct in the level of accuracy in reduced speed tests when lab calibrated drivers are used with known calibration curves (speed vs efficiency). If your using a job driver with only a guaranteed efficiency, then there is some uncertainty in the efficiency of the pump at reduced speed...
  19. thrusterpump

    Why is 416 s.s not included in ASTM A276-02a?

    I'm looking for mechanical properties per ASTM standards and have not found 416 to be included in A276-02a. Any one know why or if I'm totally overlooking were it is? I noticed it being referenced in A582A/582M for chemical composition but thats it. If anyone knows were to find it, please let me...
  20. thrusterpump

    Calculating or measuring heat generation in a thrust bearing assembly

    Reidh, The information i have available is just as you mentioned. I have various thermocouples recording temperatures on the housing, bearing races etc. Can you refer me to some information on calculating the heat load. Thanks!

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