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  1. Bribyk

    Excel 2003 freezes when adding trendline?

    Anyone had experience with this issue? I thought it might've been a network issue the first time but it's now done it twice. When I add a linear trendline to a chart then click OKAY, Excel freezes up and won't let me do anything. Task Manager says Excel is "running", not "not responding" and...
  2. Bribyk

    Help for a mechanical please.

    I've got a thread in the industrial engine forum thread1139-252283 that may be better here. Thanks. Brian Bobyk - Hoerbiger Canada
  3. Bribyk

    Genset load calc check please

    I've got some resistive load bank (PF =1?) test results and am trying to estimate the flywheel engine horsepower, assuming a 90% efficiency for this old syncronous generator. Gen specs: 600 kW, 750 kVA, 3 phase, 600 VAC Test results: 537/537/538 A, 600.0 VAC My calcs: kVA =...
  4. Bribyk

    High temperature pipe & flange ratings

    I need to know what (blind) flange class is equivalent to Sch-20 carbon steel (or Sch-10 SS) at 1300-1500 degF for engine exhaust service. The free references to ASME/ANSI standards online don't seem to go to this high of a temperature and I don't want to buy a standard to find out that it...
  5. Bribyk

    Dyno torque calibration

    I'm trying to determine the statistical uncertainty of an engine dynamometer's torque reading (load cells). I've taken 120 randomized (target load value and order) data points (well normally distributed) over three separate time intervals to compare the "known" torque to the measured. The...
  6. Bribyk

    Corrected fuel consumption

    I am familiar with the methods of correcting power for ambient test conditions but how is this done for fuel consumption, particularly gaseous fuels? Is this addressed in the various correction methods (ISO, SAE, DIN, JIS, etc...)? Corrected (brake-specific) fuel consumption isn't as simple as...
  7. Bribyk

    Water evaporation rate from underground tank

    I've got two connected underground concrete water storage tanks that are losing water at what seems to be a high rate. There is limited airflow through these tanks as there are only small breather holes in the lids (8 X .25" dia), connected drain piping to an evap tower and two submerged...
  8. Bribyk

    annealing and bending cast Al

    I recently picked up a little shop tip for bending aluminum sheet (likely 6061) into complex shapes without fatiguing: apply Sharpie marking, bend, heat until Sharpie disappears, rebend and repeat. Apparently, the temperature the Sharpie marker disappears at corresponds well to the proper...
  9. Bribyk

    Industrial gas engine exhaust backpressure minimum?

    Any idea why an engine manufacturer would specify a minimum exhaust backpressure on both NA and turbo'd models? I need an exhaust system that will work for a wide variety of engines and outputs. The system needs to be large to keep the pressure below the maximum spec for the biggest engines...
  10. Bribyk

    Low-hour engine oil reuse

    Does anyone have experience with reusing engine oil? We load test our engines after overhauls but do not like to ship them full. I am looking into filtering, testing and then reusing the oil used during the QA tests as some of the engines require a large amount of oil and there is a large...
  11. Bribyk

    4000 bhp natural gas dyno

    Does anyone know of any facilities capable of testing natural gas engines up to 4000 bhp? I would imagine that the OEM's (Cat, Waukesha, Cameron, etc...) have them but I do not know of any independent facilities.
  12. Bribyk

    Natural gas line sizing with regulator

    I'm working on sizing a natural gas line for engine fuel supply but am unsure how to include the line pressure regulator (Fisher 299H) in my flow/p-drop calcs. The regulator manufacturer doesn't supply droop (or pressure drop) numbers for the regulator, only rated capacity figures. The rated...
  13. Bribyk

    Lock position of existing geometry

    I'm attempting to sketch within an existing building layout (previously an architectural AutoCad file) in the 2D model sheet but, when I dimension lines that I have just drawn it moves the existing geometry rather than my new line. I've tried locking and creating a rigid set of the existing...
  14. Bribyk

    Balloons that won't attach

    I'm trying to attach balloons to identify different states in a process flow diagram but they won't work. The program is waiting for me to "click on an element or free-space point" but I can't highlight or pick anywhere so nothing happens. I tried unblocking the schematic but I still can't pick...
  15. Bribyk

    Schematic relationships explode !?

    I'm trying to create a master plumbing and instrumentation diagram for our dyno room and then create separate sheets of each system (i.e. compressed air, data acq, CNG supply, etc...); which are on their own layer. I can't figure out how to get one subsystem to show up on another sheet. If I...

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