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Recent content by mc5w

  1. mc5w

    Physics of supersonic flow in piston ring gap

    I take it that the Mach 1 limit is in part because the ring gap is rectangular nozzle instead of a convergent/divergent nozzle. I suspect that besides machining simplicity the ends of the rings are machined with as little rounding of the corners as possible to block gas flow from becoming...
  2. mc5w

    Using fans to cool an Industrial Control Panel

    Also, some compressed air components have marginally overstated overstated ratings - you generally do not want to run air compressors, aftercoolers, refrigerated filter dryers, etc. at their maximum ratings. Instead, you need to run them a little less than their ratings.
  3. mc5w

    Using fans to cool an Industrial Control Panel

    There are also air conditioners that are built for cooling control panels. These will generally be more economical than vortex coolers IF the environment is clean enough for an air cooled air conditioner. The disadvantage of compressed or is that about 2/3rds of the work done by the compressor...
  4. mc5w

    Using fans to cool an Industrial Control Panel

    The first time that I installed a punch press ( metal stamping ) press was a 400 ton Minster press that had been manufactured in the late 1950s. When the Akron-Selle Company purchased this press from Monarch Rubber in 1993 they had a millwright contractor rebuild the press and check out its...
  5. mc5w

    Elevator electrical name plate

    Part of what is confusing you is that time delay ( on overload ) fuses and circuit breakers were invented to allow motors to start without having to size the fuse of circuit breaker for say 1,400% of motor full load current. The ability of a generator to start and run a motor depends on a few...
  6. mc5w

    EGR restriction influence on particulate matter formation

    I have also seen at least 1 instance where somebody deliberately maladjusted their diesel engine ( in this case a pickup truck ) to produce soot every time they stepped on the accelerator. This can be done by backing out the screw that limits the maximum displacement of the injector pump causing...
  7. mc5w

    Filter to Remove Sugar from Hydrocarbon Fuel.

    There is a woman over at Quora.com who says that she sustained $2,400 in engine damage after someone put sugar in her fuel tank. The sugar somehow got past the fuel filter and the fuel injectors. Since her car warranty did NOT cover vandalism she had to pay the bill. That is proof that sugar...
  8. mc5w

    Filter to Remove Sugar from Hydrocarbon Fuel.

    I am worried about sand which is really easy to filter. HEY PUD: A locking fuel cap for a fixed fuel tank can be defeated with a PIPE WRENCH. MacGyvers2000: I cannot find data on the solubility of sugar in gasohol. I suggest that you run the experiment. Sugar is soluble in ethanol and there...
  9. mc5w

    Filter to Remove Sugar from Hydrocarbon Fuel.

    I forgot to mention that there is NO data available ( at least not through Google ) on whether sugar is soluble in fuel stabilizers. So, I suggest that you test solubility of sugar in fuel stabilizers. I do not have the money or the facilities to run these experiments. In some applications...
  10. mc5w

    Filter to Remove Sugar from Hydrocarbon Fuel.

    TugboatEng: According to the Popular Mechanics website, sugar will not dissolve in gasoline but will clog up the fuel filter. I am looking for something that will do a better job of trapping sugar other than letting it clog a fuel filter or putting in a bigger fuel filter and stocking LOTS of...
  11. mc5w

    Filter to Remove Sugar from Hydrocarbon Fuel.

    1. I did not notice that there is a fuel forum before I posted in the General Mechanical forum. 2. MacGyvers2000: During World War 2 male pilots sabotaged airplanes that were flown by female pilots by putting sugar in the fuel tank. I suggest that you check your data. Putting sugar into fuel...
  12. mc5w

    Rack and pionion brake system

    You can buy off the shelf electrically powered linear actuators that meet all your needs including a parking brake when powered off just the brakes in bridge cranes and elevators. You do not need to build them from scratch. You should try off the shelf first because that will be cheaper than...
  13. mc5w

    Transformer purging after tripping off line

    By the way, some power plant generators are cooled with pressurized hydrogen because it is a very efficient heat transfer fluid both because of its ability to convey heat and it requires less power to blow it around than air. Also, hydrogen without any oxygen or moisture protects the generator...
  14. mc5w

    Heat Tracing Thermostats

    When I built somebody a pipeline antifreeze system using self regulating heat tapes and thermal insulation I installed line voltage thermostats that would turn off the power when room temperature went above about 40 Fahrenheit. There is nothing illegal about that. At 50 Fahrenheit self...
  15. mc5w

    Lightning Arrester Failures within S/S

    Also, ungrounded 3-wire 3-phase systems that have no transformer + light bulb ground detector or similar means to drain direct current from the system can build up EXPLOSIVE amounts of static electricity during rain if there is any amount of overhead line. At 1 factory where they had 480 volts...

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