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  • Users: CRG
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  1. CRG

    NRC to Focus On Industry Driven, "Commercially Viable" Research

    Looks like the road to State capitalism. If you don't like economic freedom, you should be supporting the government at the helm of a central planned economy instead of distributed economic freedom. One difference, when a company pays for their own R&D, there is a natural selection that takes...
  2. CRG

    New Engine Break-In

    Even though my statement below has nothing to do with the original posters question, I thought that I would add this to make some folks here cringe. It still makes me cringe to think about it, but it worked. Years ago, I was involved with the marketing and repairs of Spanish two-stroke dirt...
  3. CRG

    Changing Viewport

    CarlB, something odd is going on here. When I closed the drawing and reopened it, the viewport problem was resolved. Thank you very much for pointing me in the right direction.
  4. CRG

    Changing Viewport

    UCSFOLLOW variable did not remedy the problem, but thank you for the suggestion. Locking the viewport is not an option that will be helpful. The problem is with autocad and locking the viewport does stop the automatic change; however, that will not take care of the problem. I am using a 3rd...
  5. CRG

    Changing Viewport

    I have a problem with one specific drawing where I have created a right viewport; however, if I doubleclick in the port to enter model space, the viewport automatically changes to a top view. If the viewport is locked, no change to the view. This problem only exhibits itself in one drawing so it...
  6. CRG

    Slurry pump

    You did not provide much info. Does it have a flooded suction?
  7. CRG

    Welding of magnetized pipe

    Duwe6, how do you let the filler-rod drip up into the puddle for out-of-position-welds.
  8. CRG

    Calculate the flow coefficient and pressure drop through valve

    Find valves of similar construction and contact the manufacturers to get the flow coefficients. Look at the spread in the data to determine if you are comfortable with taking the average. If you cannot find manufacturers with similarly constructed valves, then ask your professor that gave...
  9. CRG

    Riser in a tubesheet

    SnTMan, not sure how you are going to turn seismic loads into a pressure. 78692Ali, are you sure that you are not being asked to work outside of your depth without a safety net?
  10. CRG

    Pipe material

    CAUTION: Do not use Sch 40 threaded pipe for your grease service. It is not uncommon to use 120 lb or 400 lb grease drums with a common supply pump for large facilities. Pressures can be high and as such, pipe schedule should be based on maximum shut-in pressure.
  11. CRG

    Source for CG Height of a 2012 Car?

    Contact an A&P mechanic in the area and he will tell you who is doing weight & balance work/verification. Not exactly a low budget solution, but it should be accurate for weight.
  12. CRG

    Graduated this May still unemployed?

    You don't say what geographic area you are in nor the desired field of engineering that you want to pursue. Is there a professional organization for the area of your interest? Example: If you are interested in HVAC, then join ASHRAE. If you are interested in piping or pressure vessels, then...
  13. CRG

    Safety valve underpressure oil tank

    How about a weighted damper similar to what is used in the HVAC industry? This could be the simplest solution.
  14. CRG

    Simple While Loop

    I couldn't see anything wrong. Then again, I couldn't see anything. Double check your file that you posted.
  15. CRG

    Safety valve underpressure oil tank

    You could do it either way control valve or VFD. I would look at a redundant system where you could measure the differential pressure and control the fans speed and then have an additional differential pressure transmitter operation a pneumatic control valve. Look at a Rosemount 3051 with a -3"...
  16. CRG

    Freeze Protection Temperature Setpoint Value?

    Why would the thermal expansion of water dropping from 4 degC to just above 0 degC be of any more concern than the thermal expansion of water rising in temperature from 4 degC to 8 degC. I think that someone just pulled the 4 degC number out of their a**. It is just as important to consider the...
  17. CRG

    Contact and sub surface stress calculations

    dhengr, I hope that you were joking with the statement, "it's magic, leave it at that." I could not recommend that anyone use a piece of software unless they can understand the underlying theory and equations; otherwise, how else can you understand the limitations of the software. Just because...
  18. CRG

    Freeze Protection Temperature Setpoint Value?

    The problem is not just about the margin for minimum temperature and also about the quality/uncertainty of the heat transfer coefficient. 1. Are there shoes? 2. Are there areas that may not be as well insulated as others? 3. Is the line above grade where there could be different wind speeds...
  19. CRG

    High Pressure Safety Valves on boilers in NYC

    The two valves have different set points to reduce chatter. Google "PSV chatter" and I am sure that you will find a lot of good information. http://webwormcpt.blogspot.com/2008/08/psv-chaterring-is-destructivethe-ways.html
  20. CRG

    Interesting Equation

    David you are correct. API RP 14E erosional velocity doesn't look like it has much to do with the origin of your equation in your first post. The equation from API RP 14E uses the erosional velocity equation in the context of two phase gas/liquid flow. According to the "Handbook of Natural...

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