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Recent content by RobertACookPE

  1. RobertACookPE

    Oil Fired Boiler Flue / Exhaust Gas

    Well load changes will drive everything: You have got to fix something before analyzing the effect of temperature on flue gas temperature. That why I assumed you were at some specific load (implied 100%) at your highest reasonable summertime temperature: That means (perhaps) 95-98 degree...
  2. RobertACookPE

    Cutting boiler reheat pipe in cold position

    in calculating the total displacement at the "cut position" (from cold position of the entire pipeline to operating temperature of the entire pipeline and attached eqipment) remember to account for the movement of the equipment nozzles. Turbine inlet nozzle I was at a few weeks ago moved 1.125...
  3. RobertACookPE

    Throttling pump to get it back on the curve

    It's hard to believe in today's environment, with today's electric costs and bottom-line requirements, that he's able to get a manager to say wasted energy is "not important" - long term fuel costs are much greater than the (apparetly lower) initial equipment cost. The noise, lack of...
  4. RobertACookPE

    Oil Fired Boiler Flue / Exhaust Gas

    It should be roughly linear: Assuming a constant air flow and constant fuel flow with no change in fuel chemistry or burning adjustments = same heat gain by the furnace air. Cooler inlet combustion air, assuming the induction fan flow doesn't change much with the cooler air, and assuming the...
  5. RobertACookPE

    Volume of water required for hydrotest

    I did my hydro-static testing many years ago on (shorter) nuclear power plant piping, where temperature changes (while the pipes and reactor vessels were filled solid) were mostly from running pumps or heaters, not from environmental temperature changes. But similar rules will apply...
  6. RobertACookPE

    Need a (3D) Pipe Routing Program: Which have you liked/hated?

    I've downloaded and read CADPipe's user manual this weekend: everything in it seems straight-forward and easy enough - assuming you've got a background in AutoCAD 3D rules and osnaps and xyz manipulations. 3D polylines, rotate3d, and mirror3d are easy enough, and CADPipe looks like it uses...
  7. RobertACookPE

    Building Pressure Test Vessels

    From your question, I 'm assuming you'll be making or specifying the test vessel rather than contracting out the job. For a one-of-a-kind test, contracting will be less expensive. First, you'd need to determine absolutelargest gadget you're ever going to want ot test: Almost assured, first...
  8. RobertACookPE

    Need a (3D) Pipe Routing Program: Which have you liked/hated?

    Working in a relatively small group, now using Autodesk Inventor R11 for mechanical definition of equipment and concrete interferences in various power refit projects. Inventor is very, very poorly organized for 3D pipe routing (it's OK for mechanical fab and design though), fitting placement...

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