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  • Users: FredRosse
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  1. FredRosse

    Diesel Common Rail Injector Pump Drive System

    We have Diesel/Dual Fuel Engine-Generators, with a new "Micro Pilot" fuel oil injection system, a modern common rail high pressure system, with electronically controlled injections. The engines are rated at 2500 kW, 400 RPM, 17 x 22 B&S, inline 8 cylinder engines, direct coupled to their...
  2. FredRosse

    PM DC MOTOR AS GENERATOR

    I have made a home generating system (Diesel Cogeneration) where a small Diesel engine directly drives a simple single phase AC induction motor. When the Diesel engine drives the motor above synchronous speed, it becomes a generator, delivering power to the grid or my house, and when the...
  3. FredRosse

    VFD Minimum Output Frequency

    Can typical (60 Hz input, 100 + horsepower ) VFD drives allow output at say, 1 Hz, 10 Hz, 30 Hz ? I understand that driven equipment may have problems at very low speeds, but the question here is if VFD systems usually have a "built in" minimum output frequency, or can you set the VFD at ...
  4. FredRosse

    Removal of ethanol from gasoline

    I have seen where mixing water with E10 pump gasoline will then allow the water/ethanol mixture to separate from the gasoline. This is stated to be necessary for preservation of older (collector) vehicle fuel systems that suffer many ills from the new gasoline E10 or E15 fuels. I understand...
  5. FredRosse

    Oil Discharge Into Waterways

    Oil into lakes and rivers is an event we all need to be mindful of. Bilge water will often have some oil, and the Oil-Sorb Pads are effective here, provided they are not too overloaded with waste oil. Does anyone know of environmentally acceptable oils that are biodegradable and that could be...
  6. FredRosse

    OIL CONSUMPTION

    A question: Oil consumption in IC engine practice is very low, but with steam as a working fluid, oil consumption is prohibitively high. Why is this so? With a conventional IC engine converted to steam, any significant oil in the exhaust is very bad, however the oil consumption normally...
  7. FredRosse

    Piston IC Engines, Internal Inertial Loads

    "The greatest load on a connecting rod is inertial load…………… I have herd this statement several times previously (that inertial loads are the big item, 5-10x the pressure loads), but as far as I can see with real calculations, this may be an old wives tale, or only applicable to screamers like...
  8. FredRosse

    Pipe Schedules & Sizes

    Does anyone know the history here for typical small pipes, such as 1/4 inch IPS to 2 inch IPS? Why was 1/2 IPS pipe made 0.840 outside diameter?, what was the logic for developing "Schedule" pipe, what was the origin of "Schedule 40 pipe, Schedule 80, etc? History questions that have not had...
  9. FredRosse

    Mechanical Engineer needs a Small Motor

    Built a John Fitch steamboat model for the museum, and need to get a proper drive motor. The boat is 7 feet long, a replica of the first commercial steamer in the world, 1790 vintage. The model is powered by live steam or electric power, with radio control. The boat can be seen at...
  10. FredRosse

    ASME Code Stamp Holders

    Where can I get a list of ASME "S" & "M" stamp holders? Thanks in advance
  11. FredRosse

    Wiped Rod Bearings

    I recently found some connecting rods for an engine that is out of production, and finding spares is very difficult. The rods are a cast aluminum alloy, without bearing inserts. The rods are OK, except the big end bearing surfaces are scored badly. Is it possible to rebuild these rods, by...
  12. FredRosse

    Hydrogen Temperatures inside Generator

    We have a hydrogen cooler for a large electric generator, which requires 2000 GPM of cooling water at 85F. I know the heat load. Evaluating cooler performance with new coolant properties an new coolant temperatures, I need to know the Hydrogen inlet/outlet temperatures. Does anyone know the...
  13. FredRosse

    Generator Hydrogen Coolers

    We have a hydrogen cooler for a large electric generator, which requires 2000 GPM of cooling water at 85F. I know the heat load. Evaluating cooler performance with new coolant properties an new coolant temperatures, I need to know the Hydrogen inlet/outlet temperatures. Does anyone know the...
  14. FredRosse

    LRA - Inrush Current Definitions

    For an Induction Motor with across the line starting. Some indicate that the initial instantaneous Inrush Current is much larger than Locked Rotor Amps (LRA ), while others state that they are the same thing. Which is correct? Please help this ME Thanks in advance.
  15. FredRosse

    Mechanical Drive Efficiency

    I would like to determine the mechanical drive efficiency for common roller chain, V-belt drives, and timing belt drives. All of the vendor information I can find gives rather vague information, that drives are "high efficiency" or something similar. Quantification is also vague "90%-98%" or...
  16. FredRosse

    ASME Safety Valve

    ASME Application Question I have an ASME Safety Valve, 100 psi, rated for steam service, with an ASME "V" stamping. Can I use this valve on a Fired Power Steam Boiler, (Sect 1)?
  17. FredRosse

    PM DC Motor Characteristics

    I am a ME, and would like to know about DC PM Motor External Characteristics. For the motor in question (Briggs & Stratton ETEK) I have 48 VDC performance data (RPM vs Torque, Amps vs Torque). The outputs here are far beyond my needs. I would like to operate on 12 and/or 24 Volts DC...

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