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  1. vpl

    Anyone Have Any Soils Experience?

    This is totally outside my area of expertise. My daughter lives in Tampa about 20 miles from the place where the sinkhole that just swallowed that guy in his bedroom. She called the other evening asking if there was any way to tell if a sinkhole was developing before it actually did. I have...
  2. vpl

    Translating "Electrical" Into English

    I figured this might be the best place for this as, even though it's a work-related question, I'm not an electrical engineer. I'm reviewing a document that seems to be mixing KVARs, ohms and watts. The person who wrote it is a good electrical engineer, but not a native English speaker. I'm...
  3. vpl

    Accuracy of "JULIE"

    I'm having a new concrete patio installed at home. As part of the work, people from JULIE (the Illinois "Joint Utility Locating Information for Excavators") came out and flagged about a 2'x1' area in the backyard and noted that there were buried cables for the electric, phone and cable...
  4. vpl

    What Year Was the "NFPA Handbook, Revision 14" Issued?

    In response to an issue, a utility referred to "NFPA Handbook, Revision 14" and then Standards NFPA-13 and NFPA-15. I've gone into my IHS subscription, and, as far as I can tell, the standards use an edition year rather than an revision number. I've also looked on the NFPA website and, again...
  5. vpl

    Void Formation due to Pressure Drop

    Recognize this is a pretty basic question, but I'm away from all my reference books by 1000+ miles and it's not an area I normally deal with! I have a closed volume at average temperature of 370°F and pressure of 1100 psia. I cycle a valve opening the system to another volume at 230° and 21.5...
  6. vpl

    Centrifugal Pump Startup: Suction Voiding

    I'm investigating an issue where suction voiding during the pump startup may be an issue and I'm trying to get more of a feel about what's going on. Starting off I have a large (1200 psi, 3300 gpm) turbine-driven pump. The contractor I'm dealing with believes that the pump has a short-term...
  7. vpl

    Metric II

    The original post is getting a little hoary -- not to mention hard to read. So this is an opportunity to continue the debate in a nice, new post where people may actually read your input because they don't have to wade through 100's of other posts to do so. Patricia Lougheed Please see...
  8. vpl

    Can Pumps Operate Below Shutoff Head?

    I've got a situation where I'm reviewing some calculations and test results on a centrifugal multi-stage pump. The vendor gives a "best efficiency" point of 800 gallons per minute (gpm)and a "shutoff head" value of 70 gpm. The system has a minimum flow line that has both an...
  9. vpl

    Are We, As Engineers, Willing to Admit Mistakes?

    This is a takeoff on JOM's post in thread765-64959. He asked "Would it raise hackles to suggest that engineers are not too ready to admit they can and do make serious mistakes?" Seeing as I work for the feds and my job involves verifying the adequacy of engineering work done by...
  10. vpl

    Minor Gasket Leakage During Cooldowns

    This may qualify for stupid question of the year, but... Does anyone know how cooling down a system (dropping both temperature and pressure) affects leakage through gaskets as compared to full power operation? My practical experience is that when a system is heating up, minor gasket leakage...
  11. vpl

    Title of GE SIL 636

    Does anyone know the title and issue date of this GE SIL (or even if it really exists?) This is all I have to go on, and I'm drawing a blank. I do NOT need a copy - just some more information to help locate it. Thanks!! Questions on what gets something red-flagged? See FAQ faq731-376...
  12. vpl

    Effect of Valve Throttling on Upstream Pump Suction Flow

    I need some help with probably a very basic fluid flow problem. I'm reviewing a flow model evaluating the effect of adjusting a control (butterfly) valve. The valve changes from about 34% open to 40%. It is located fairly far down the line (there's a half dozen valves and a lot of piping...
  13. vpl

    Nuclear PE Exam Review

    Does anyone know of any good reference materials or review courses for studying for the nuclear PE exam? Patricia Lougheed
  14. vpl

    Water Correlation Between Temperature & Pressure

    Somebody asked me this, and I don't know where to go find the information. Maybe one of you could point me to a reference?... Is there a correlation between temperature and pressure for water? I know it's basically incompressible, but not entirely. The person who asked me said he had heard...
  15. vpl

    Any Advice on Dealing with "Look Good" Managers?

    My boss and I had a discussion this morning about our upper management. We both agreed that the current upper management in our organization is more concerned with "looking good" than in "doing the right thing." They are also, by their own admission, looking for the next...
  16. vpl

    Butterfly Valves: Flow versus # of Handwheel Turns

    I've been given some test data on a butterfly valve that I'm trying to validate. My validation information is in gallons per minute. The acceptance criteria was given as being from 22 to 26 turns, and I was told that +/- 2 handwheel turns from the nominal 24 turns equated out to +353 gpm to...

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