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  1. Zapster

    Different Grade between Pipe/Flange/Elbow

    So this begs the question of what A234 is equivalent to in B31.8. I know that if7005 asked specifically about B31.8; however, some B31.3 data makes me wonder. I know that SMYS are NOT interchangeable between the two codes; however, B31.3 list the tensile strength for both at 60ksi, the yield...
  2. Zapster

    support shoes or saddles

    Per B31.4 404.91, if line is operated above 20% SMYS then support must be attached to full encirclement reinforcement. Per B31.8 834.5 if hoop stress is greater than 50% then support must be welded to full encirclement reinforcement. I understand that it might be frowned upon in certain...
  3. Zapster

    support shoes or saddles

    I have seen several different means to attach pipe supports to the pipe. Obviously any attachment method should be evaluated to ensure that the combined allowable yield stress is not exceeded. So for ASME code piping, B31.8, B31.4, B31.3, and B31.1 are there restrictions other than code stress...
  4. Zapster

    Colebrook friction factor

    katmar and BigInch, thank you for the helpful replies.
  5. Zapster

    Colebrook friction factor

    What are the origins for different Colebrook friction factor equations shown in a few texts? This one I have used in the past is 1/f^(-0.5) = -2Log(?/(3.7Re)+2.51/(f^0.5*Re)) Not sure why John McKetta and Ron Darby use these coefficients: 1/f^(-0.5) = -4Log(?/(3.7Re)+1.26/(f^0.5*Re))
  6. Zapster

    Educated" opinions on climate change - Part 5

    Josephv, you are mistaken on several accounts. Carefully read your links and what you stated. Do you know the difference between GDP and per capita? There are many countries with higher energy usage and pollution generated per capita than the United States (yes, even GHG which I consider to...
  7. Zapster

    Educated" opinions on climate change - Part 5

    josephv, you are mistaken.
  8. Zapster

    Should I Choose Mechanical or Electrical?

    Is it true that electrical engineers rarely shift to mechanical because they can't handle all of the associated conversions of units?
  9. Zapster

    Pipe elbows less than 90 degrees.

    dbecker, "Handbook of Hydraulic Resistance" by I.E. Idelchik has a chapter, "Resistance To Flow With Changes Of The Stream Direction; Resistance Coefficients of Curved Segments -- Elbows, Bends, etc. The above book should cover most of the info you are asking. From your response, your main...
  10. Zapster

    Pipe elbows less than 90 degrees.

    dbecker, are there a lot of these non standard bends in your project that significantly add to the system losses? Perhaps it does not make much difference regarding the loss coefficients if they only add up to a few percent of the system loss. How accurate do you think your calculations will...
  11. Zapster

    cat cooling systems

    Do the Cat's radiators use the same material of construction as the Detroit's? Are the Cat's radiators subject to more vibration than the others? If so, could stress induced corrosion be an issue?
  12. Zapster

    Flow Through Pipe, Reaction at Hangers

    Kapil, is there a specific question in your post?
  13. Zapster

    Can increasing backpressure increase the flow of a flashing liquid?

    wisepeppy, I agree that it seems that flow might increase by placing an orifice on the discharge end of the pipe where you only have two phase flow exiting the orifice and single phase (liquid) upstream of the orifice. I had thought about this scenario regarding condensate flashing creating two...
  14. Zapster

    Radiant heating and cooling

    A curious name for your thread because it can have two meanings. Is someone trying to use radiant cooling???? or is it a radiant heating system with traditional forced air cooling? If it is the first, then condensation will be problematic.
  15. Zapster

    Should I start studying engineering in my late 20s?

    I pursued a degree in Engineering when I was in my forties. I was recruited by an international corporation half way through my senior year for a job that paid well above the average. Age is not a barrier; however, I think it is important that you differentiate yourself from your competition...
  16. Zapster

    Water spray bar design.

    Your fluid velocity is low enough that I question your concern? It looks like your fluid velocity will be less than 1/2 ft/sec for the smaller pipe size and 1/10 ft/sec for the 1" pipe. Assumed sch 80.
  17. Zapster

    Educated" opinions on climate change - Part 4

    Guys, if you are not prepared to jump on the “Global Warming” or “Climate Change” bandwagon, perhaps it is a mental disorder according to the American Psychological Association: http://uk.news.yahoo.com/22/20090805/tsc-environment-us-climate-psychology-011ccfa.html
  18. Zapster

    Arkansas seismic requirements

    AK is not an abbreviation for Arkansas, it is AR.
  19. Zapster

    Bolt class and grade

    I like Portland Bolt: http://www.portlandbolt.com/products/ I think that it comes up when you use Google. What specific information do you need that they don't have on their site?
  20. Zapster

    The "piping Guide" is back.

    Caution, for many users it is a waste of money to purchase the “Piping Guide CD.” It does not work on many of our company’s laptops and some of our desktops. All of the computers that do not run the CD have operating systems that are claimed to be compatible with the HexaLock system. This is...

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