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  • Users: jfriddell
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  1. jfriddell

    pressure and volume changes for a liquid filled system

    Engineers: I'm working on a subsea project where I intended to de-mate a control line coupler pair. I know when I de-mate the coupler pair under pressure a very small volume of fluid (liquid) will be released from the system. The couplers have a poppet which will seat upon demate and thus...
  2. jfriddell

    potential energy of a compressed gas

    All: I have been asked to assist with reworking the projectile calculations guideline for my company. We perform a significant number of high pressure hydrostatic and gas tests of pressure containing equipment. I would like to request assistance from compression experts to assist me in...
  3. jfriddell

    Can simple transformers be used in both "step-up" and "step-down&

    I am strictly dealing with 1-phase electricity. I have an application where I have a 120 VAC only output generator (2000 W) and I wish to run a very small load (~ 400 W) which requires 240 VAC. Can a 240 VAC primary/120 VAC secondary transformer be used to "step-up" 120 VAC to 240 VAC? If...
  4. jfriddell

    large volume pump station, variable demand

    Forum Participants: I'm working on a project where the customer has one large diversion point for his water right from a river. Water will be drawn from the river through a large wet well (like a reservoir can pump) structure using a vertical turbine pump. Decreed flowrate is 4,500 gpm. This...
  5. jfriddell

    determining voltage drop for 1-phase lines

    Gang: I'm a "lurker" on this board and have found many helpful tips and knowledge. Thanks to all who make these boards so interesting and helpful. Now for my question: I'm an agricultural engineer who is quite rusty on my elementary electricity. Could somebody refresh me on the proper...
  6. jfriddell

    kW vs. kVA and power factor

    EE's: I'm an agricultural engineer that is working on the sizing of generators for center pivots (motor starting applications). I'm a little confused about kW vs. kVA and the power factor. Is the power factor value something that is associated with the motors, the generator, or both? Should...
  7. jfriddell

    Using engines with odd # of cylinders for SAE mount pumps

    Gang, I work for an irrigation dealership in South Texas. About three years ago, we matched several SAE mount pumps (from a very reputable manuf.) to 3-cylinder engines (also from a well established manuf.). They ran good for about 1.5 years, then we started noticing extreme wear, worn...
  8. jfriddell

    What is the highest suction lift witnessed?

    Gang, I've been asked by a customer to find a pump that would be capable of a suction lift of 25 ft. The application would be on off shore oil rigs. I guess you could say we are in the best possible location to be achieving high suction lifts. Flowrates would be 1000-1200 gpm with no...
  9. jfriddell

    Do I need to purchase HP GL/2 card for new HP 500 plotter

    Gentelmen and Ladies: I am in the market for a new HP 500 plotter. Some vendors have told me that I need the HP GL/2 accessory card, siting printer compatibility issues, and some have not. I mainly print ACAD, generic CAD, and some aerial photograph graphics. Do I need this accessory card...
  10. jfriddell

    sizing pulleys and belts for pump and engine

    I need to power an irrigation pump via a combustion engine. I need the pump to turn at 3100 rpm and the engine to turn at 2250 rpm. The engine will output 58 hp at this speed. The pump needs 49 hp. I'm assuming 85% transmission eff. across the belt(s). Is this a good assumption? How do I...

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