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  1. 777gne

    Non-Newtonian Pressure Drop (revisited)

    After quite a bit of help from Latexman last year (this thread: http://eng-tips.com/viewthread.cfm?qid=177111&page=1) I have been calculating frictional losses for power law fluids rather successfully. Most of the calculations I have double checked by a fluids lab that I work with and my...
  2. 777gne

    3D Thermal Data?

    I'm completely new to thermography. I'm involved in a project that where we're introducing a heat source into the center a cube-shaped medium. We need to record the migration of the heat in all directions from the source over a fixed time interval (2-3 minutes). The ideal end result would be an...
  3. 777gne

    Flow calculation

    The above diagram represents 2 pipe circuits, the header in bold and a utility circuit (thin blue line). The pressure at points P1 and P2 is known, and the header flow rate is known. The pressure at P3 is assumed to be equal to P1 (close enough to call equal). Can the flow rate through the...
  4. 777gne

    EPDM or Viton against ozone?

    What is the consensus regarding EPDM and VITON resistance to ozonated water? I have had problems with EPDM in and gaseous ozone, VITON was better in this case. I have heard mixed reviews on which to use when it comes to ozonated water. I'm not a CE so admittedly I don't know how it would differ...
  5. 777gne

    Handrails needed or not?

    This topic has come up over and over at our plant. When building an elevated work platform, at what height are handrails required (by OSHA). We have several platforms that are less than about 12" above the floor without handrails, that operators use intermittently. UBC doesn't really cover this...
  6. 777gne

    Capacitive Prox Switch Question

    If a capacitive prox switch, being used to detect liquid level, becomes submerged by the liquid is would you still expect it to signal the PLC that it detects the liquid? One would think so, I'm just wondering if this might produce erratic results. The assumption is of course that the...
  7. 777gne

    Glycol / Water Mixture Vapor Pressures?

    I need to determine the vapor pressure of a 50/50 mixture of propylene glycol and water at several temperatures around 100-140 degrees F. Does anyone know of a good reference that might have this information tabulated?
  8. 777gne

    Non-newtonian Pressure Drop

    Now that I have my pressure drop spreadsheet all polished up I get thrown a curve ball; I got handed some rheology data for a several shear thinning fluids. I'm a little rusty with non-newtonian fluids. Here's what I think I know, I'm hoping someone can give me a nudge... The data that I have...
  9. 777gne

    Darcy Friction Factor of Stainless OD Tubing ?

    I work mostly with sanitary (ASTM A270) stainless steel OD tubing and in many cases need to model process systems to calculate pressure drops including frictional losses. In my case the inner surface will either be 32Ra or 20Ra. Does anyone know how, if at all, this can be related to absolute...
  10. 777gne

    Boiler Horsepower Realtion to Capacity

    How is it that a boiler horsepower can be defined as simply being equal to 34.5 #/hr of water evaporated at 212ºF? Can this be adjusted to allow for varying feedwater temps and final steam temp/pressure?
  11. 777gne

    Designing pit / trench concrete thickness

    This, I'm sure, is basic stuff but I don't deal with a lot of concrete work so I could use a little help. I've got to put some pits into the ground in a processing plant. The pits are roughly 4'x10' x 4' deep and have vertical walls. We will be having these poured. Is there a design reference...
  12. 777gne

    Kynar or similar?

    I'm looking to source some Kynar sheet or a material of similar mechanical properties for machining some prototype parts from. The thickness I'm looking at is going to be 1" possible 1.5" and I only require a small amount, maybe 4 sq. ft. Can anyone kindly recommend a source where I might be...
  13. 777gne

    Gusset Design - basic help needed.

    As usual let me first state that I'm not an engineer, just a designer who tries to prevent too much 're-engineering' by our PE. My question is regarding the effects of a gusset or gussets on a simple cantilever 'beam'. Take channel for example and cantilever it out from a rigid frame say 60"...
  14. 777gne

    Deflection of flanges in angle and C shapes?

    Forgive me if this is the wrong forum to post this query, as it's not exactly a structural problem. For a given AISC "C" shape or angle, if the member is supported at its web or bottom leg respectively by bolting or welding to another rigid member, how can the deflection of either flange be...
  15. 777gne

    Scissor Lift Design

    Hi I'm just getting started on a scissor lift design and I'm trying to figure the reactions via free body diagram. Let me say that I'm no engineer so this isn't second nature to me. If anyone is kind enough to help a novice here is a link to a FBD that I drew up...
  16. 777gne

    Labeling Steam Pipes

    This seems like an easy one but I'm striking out so I'll give the forum a shot. I need to label some pipe & tubing in a processing plant and I can't find any labels that will take the temperature. It's not actually steam piping however during cleaning it is exposed to 300ºF temps for periods of...

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