Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. ronbert

    Old Timber Bridge Load Rating

    If the "dirt dobber" nests (bee nests) are removed the bridge will fail. 😜😂
  2. ronbert

    Company's Engineer of Record

    In some states an officer of the company and often the president of the company must be a PE for the company to be an engineering company. These same states do not allow a company to use the word "engineering" unless this is so. I recall a state holding Bell South liable because some of their...
  3. ronbert

    Miami Pedestrian Bridge, Part VII

    In all of the states (12) I was registered in (retired) the President of an engineering/architect firm had to be registered.
  4. ronbert

    Any idea what this symbol is?

    Not in the ISA symbol library.
  5. ronbert

    Canadians stranded after bridge splits amid intense cold

    The Order of the Engineer was formed as the result of a Canadian bridge failure.
  6. ronbert

    Educated Opinions on Climate change - a denouement or a hoax? Part 2.0

    David, The study was done on the second worst polluted city in the world using the same methods the US EPA uses to study air quality. The study shows that dispite the poor air quality the number of deaths from the poor air quality is not significant. The US EPA study (2009) of US cities shows...
  7. ronbert

    Educated Opinions on Climate change - a denouement or a hoax? Part 2.0

    For a different perspective see the attachment. http://files.engineering.com/getfile.aspx?folder=5e4345c9-0aee-467e-b2a2-c2f9dc6f258e&file=ehp-1-1103671.pdf
  8. ronbert

    farewell to engineering education

    The university I graduated from was known as an engineering school. Out of a class of 450; 350 were engineers. Since I graduated the number of graduates has risen to 700+. The number of engineers graduating has dropped to 21. I understand from my business partner that the same thing has...
  9. ronbert

    Educated Opinions on Climate change - a denouement or a hoax? Part 2.0

    TGS4 The data BEST is using is very suspect. The BEST study uses data from earth stations that produced flawed data. see: http://www.surfacestations.org/ I visited the two sites near me (<50 miles). Both sites were compromised. Each station was near an exhaust fan. The pictures were added to...
  10. ronbert

    Hazardous Area Clasification Mine Explosives and Pirotecnics

    See OSHA 1919.109 ron
  11. ronbert

    lightening arresters and poor soil

    Go to: www.iaei.org/magazine/?p=63
  12. ronbert

    unstable machine

    ITSMOKED & SKOGSGURRA; In the US "shop guys" are trained to use PPE and the proper techniques for use of a scope on 480. My BAD if 1lostsoul is not from US. 1lostsoul: The size of the VFDs you described are sufficient to generate enough HD to cause your problem. If you are not trained to...
  13. ronbert

    unstable machine

    How many and what size are the VFDs? Use scope to look at 480VAC. Sine wave should be "clean"; no dips at 90, 270, only one cross at 0, 180, 360. Be sure to look at all three phases. The newer VFDs have filter to reduce HD, BUT.. a lot of newer VFDs on same feed will produce HD that can get...
  14. ronbert

    unstable machine

    1LOSTSOUL: Have you checked the harmonic distortion on the 480VAC? How are the VFDs fed? Are the servo drives fed from the same source? ron

Part and Inventory Search

Back
Top