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  1. pekjaer

    Pumping air fan problem

    Hi Walt, Yes we have reviewed the gas system, and it has variations as well, but that has to do with the governor and the throughput. Which means no variations related to 1,5 Hz. What I mean is: It seems as the frequency is not depending on flow or other process variables, but only on some kind...
  2. pekjaer

    Pumping air fan problem

    Hi Thanks for the responce. As the answers evaluate, it becomes obvious, that more and more specific data is needed (well, so big surprise). From the fan we have this 12m 410mm pipe to a tee. Dividing into 2 times 350mm lines each side of the furnace length 10m. Min flow (pilot burners ON) is...
  3. pekjaer

    Pumping air fan problem

    Hello Mike, Very good point, but unfortunately this can be ruled out. Its a very large production hall, and about half of the side walls can be opened by large "damper-windows". The pumping problem does not change at all whether the dampers are open or not. Poul Erik
  4. pekjaer

    Pumping air fan problem

    Hi Mike, Thank's for your reply. You are right, no water here. We can (but cost and time!) move the elbows, but the reason for the question to the forum is, that I am not sure it will help - there might be another overseen problem. Therefore I hoped, that somebody in the forum had an experience...
  5. pekjaer

    flame intensity vs. temperature

    Hi Macmet, The match analogy is nice, but all the truth. If you imagine a match in an 500dgr. stove, and a match in snow pile, you would see a large difference in the flame tamperature. The socalled adiabatic flame temperature is the theoretical temperature calculated if it was not cooled - but...
  6. pekjaer

    Pumping air fan problem

    Hi collegues, Working with industrial furnaces. Gas burner system where we have a centrifugal fan producing combustion air. Its an 45kW electric motor direct coupled to the impeller. Back folded blades for a "flat pressure curve". Pressure 0,15 bar and 5000Nm3/h, atmospheric air. The fan is...

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