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  1. Slay the P.E.

    NECEES Mechanical PE Reference Manual Released

    The link doesn't work because one has to be logged in to myNCEES to download the manual. I'm going to urge HVAC people to download and review this ASAP. It should put to rest any doubt about what ASHRAE handbooks to bring to the test. Here NCEES has copied everything they deem important. You...
  2. Slay the P.E.

    Relative roughness of a pipe?

    If "B" is a reservoir, then VB = 0, so that's the first thing you're doing wrong. Also, when you write the Bernoulli equation from A to B, then hf has to be from A to B. From what you wrote above, your hf is only from A to the end of branch 1. So, yes, you need to add the friction loss across...
  3. Slay the P.E.

    Relative roughness of a pipe?

    How did you solve for V1 if you don't have hf for branch 1?
  4. Slay the P.E.

    Relative roughness of a pipe?

    Can you show your work? The approach you're describing here is exactly what they did in the link to solve the problem.
  5. Slay the P.E.

    Relative roughness of a pipe?

    Yes, tables usually give a range and also a "design" value (See Appendix 17.A in page A-48 of MERM13. I'm not sure what the "PE Handbook" that you're referencing is, but in MERM13, the Moody Diagram of page 17-7 doesn't have a table). But anyway, you're right. Values are typically listed as...
  6. Slay the P.E.

    question about orifices and tank draining

    They're taking Environmental Engineering exam, per their profile.
  7. Slay the P.E.

    question about orifices and tank draining

    It's exactly the same one you posted from the solution in your book. The one with the difference of the square roots of the heights.
  8. Slay the P.E.

    question about orifices and tank draining

    The equation you attempted to use is for steady state, which is achieved only when: the fluid being drained is replenished at the same rate at which it is leaving through the orifice, or the volume of fluid in the tank is so large that one assumes the water level remains constant during the...
  9. Slay the P.E.

    TFS practice problem of the week...

    Don’t know if people are aware of this thread. We won’t be adding more problems to it, but all problems here are still very relevant.
  10. Slay the P.E.

    MD&M practice problem of the week

    We won't be adding any more problems to the "practice problem of the week" threads. However, the threads are still here in the boards and are relevant, not just because of the problems themselves but also because of the lively discussion.
  11. Slay the P.E.

    Fluid Mechanics & Hydraulics for TFS Contest

    Thanks! buying our books is the best way to prepare to tackle it :) wink, wink, nod, nod.
  12. Slay the P.E.

    Fluid Mechanics & Hydraulics for TFS Contest

    This problem appears in our Fluid Mechanics & Hydraulics book. Here's the solution from the book.   Let me know if you have any questions. Thanks,
  13. Slay the P.E.

    Steam Table Metric Units

    Quick update on this. The link for the USCS units is no longer working, but I found the same table that used to lead to, here: https://www.bbpsales.com/wp-content/uploads/2017/01/3A-Appendix-Steam-Tables.pdf The link provided by @Audi driver, P.E. for the SI tables from NIST is still functional...
  14. Slay the P.E.

    Last chance to take Mechanical PE Exam in Paper-and-Pencil form is Oct.'19

    The NCEES handbook for the FE exam is available for free download. It is reasonable to assume they’ll make their PE handbook available for download as well. Maybe they’ll charge for it; maybe not. ¯\_(ツ)_/¯
  15. Slay the P.E.

    Last chance to take Mechanical PE Exam in Paper-and-Pencil form is Oct.'19

    The exams will be closed book, like the FE and the only reference allowed will be their on-screen PDF handbook. This will make it a lot easier to prepare, especially the HVAC&R folks. I bet we will never see another post here asking if one really needs all ASHRAE books or if older ASHRAE...
  16. Slay the P.E.

    Fluid Mechanics & Hydraulics for TFS Contest

    We have received all valid entries. thanks!
  17. Slay the P.E.

    TFS 2016 NCEES Problem 533

    More on this for the truly nerdy:
  18. Slay the P.E.

    TFS 2016 NCEES Problem 533

    At those conditions you have a compressed liquid (the pressure is higher than the saturation pressure at the given temperature). There are compressed liquid tables, but those tables start at fairly high pressure values.  The alternative then is to use the “saturated liquid approximation” —...
  19. Slay the P.E.

    Fluid Mechanics & Hydraulics for TFS Contest

    Well, why not? Let's do this again y'all. This time the first three to submit the right answer ( via private message here or via email to [email protected] ) will get the 50% off our ebook bundle which now includes a book on Heat Transfer and Heat Exchanger Analysis. The four books...
  20. Slay the P.E.

    NCEES TF 2016 #121

    Correct.
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