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Recent content by gregdachs

  1. gregdachs

    Casing volume

    Thanks for the advice. I ended up chatting with some mechanical engineers here and we determined that the accuracy initially asked for was ridiculous, so I did almost exactly what you've recommended.
  2. gregdachs

    Casing volume

    I have been given a list of about 30 pumps for which i must find the volume of process contained within the casing. i cannot locate this specific data for but a handful of the pumps. is there some sort of "rule of thumb" we can go by here, or am i giong to need to get on the phone with 15 or...
  3. gregdachs

    Limiting the max RPM during cold start

    It ultimately doesnt matter how cold ambient air is for the start, does it? What i mean by this is if the engine is hot already then the coolant temp is hot and it is no longer a cold start. Thus, the coolant sensor is all you would need. Unless, however, the coolant sensor cant see...
  4. gregdachs

    Remote starter design

    I lack quite a bit of knowledge in electrical engineering, but one thing i do know is that it is essentially impossible for a relay to fail on. It might get stuck on or not activate at all, but chances are it will not engage on its own. In my experience with some home made (by electrical...
  5. gregdachs

    Draft Fan vibration problems

    We are working on trucking in some temporary boilers now so we can keep the plant alive during the inspection. If i am still here when they get it open, i'll gladly let you all know what is going on. I am just a co-op for the summer, so they'll have to work pretty quick. Thanks again for the...
  6. gregdachs

    Draft Fan vibration problems

    I did some more serious detective work today and finally got some answers. They neglected to tell me a crucial little piece of history. Apparently a year or two ago a 50 lb piece of plate steel fell off the inside of the fan enclosure into the rotating wheel and was launched through the outlet...
  7. gregdachs

    Draft Fan vibration problems

    I apologize for my lack of clarity. The fan is a forced draft fan, thus moving ambient air. The inlet dampers are inlet box dampers. The load and fan speed remain constant, or at least approximately constant 24 hours a day. The vibration readings double at night, going past our alarm points...
  8. gregdachs

    Draft Fan vibration problems

    We have a boiler with a 10' Clarage draft fan. Right now, the fan is throttled primarily by use of the inlet dampers. We have noticed that the fan has vibration that increases at night. The shaft is balanced and well mounted and the rest of the system seems ok, so we have concluded that the...
  9. gregdachs

    Caesar II oddity

    Thanks guys. Now my answers make sense. -Greg
  10. gregdachs

    Caesar II oddity

    I did a little test file in Caesar to get a feel for what the program means by positive and negative moments. My result has only served to completely confuse me. I laid out an "L" shape, anchored at each end. The legs are on the x and y axis, and both are 15 feet. The simulation heats the...

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