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  • Users: Yobbo
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  1. Yobbo

    Minimum pitch temperature

    Dear readers, I looked at the FAQ's and the historical discussions, as well as in some text books about heat exchangers, but I couldn't find a substantiated answer to my question. My question is the following: I want to rate an existing heat exchanger for a somewhat different application. I...
  2. Yobbo

    Steam lines in publicly accessible areas

    Hi, Referring also to thread378-260783, that I found very usefull, I am looking for a guide line that tells me what is the best way to position the steam line in public areas. What I am interested in is whether it is feasible to have the steam line running underground or at ground level. This...
  3. Yobbo

    Steam/steam generator

    Hi, I am confronted with the challenge to generate process steam for a paper factory within our power plant. As the condensate does not abide our strict quality requirements I would like to investigate whether it is possible and feasible to generate steam of 8,5 bar and 182 C with superheated...
  4. Yobbo

    Valve position control ( how to determine ratio of Cv values of the coarse and fine valve )

    Dear Readers, I am aware that my question may be on the threshold of control engineering and mechanical engineering, but I give it a try anyway. For a flow control of natural gas I need to create a situation, where the controllability is high. With that in mind I am opting for a valve position...
  5. Yobbo

    How to passify the rusting of a carbon steel flue gas channel?

    L.S., I am confronted with the problem that rust formation in a flue gas channel in a power plant sometimes results in emission of rust flakes. This is environmentally unacceptable. The flue gas temperature is 150 degrees Celcius in general. The flue gas channel is made of ordinary carbon...
  6. Yobbo

    constant force mechanismsHi

    L.S., I need to solve a problem to position a flat screen in three dimensions, where it is required that any given position must remain the same after ending the adjustment. My knowledge about mechanisms is only limited. I think I need to look for solutions in the field of (nearly) constant...
  7. Yobbo

    stripping flue gas from rust particles with a spray tower

    L.S., I am confronted with the challenge to strip a large flue gas flow from rust particles. These particles are flake shaped with an area up to 2000 square millimeters and a thickness of 0.1 mm. I want to find out whether a spray tower could be a remedy to capture these particles. AFter...
  8. Yobbo

    flow straighteners

    Dear reader, My question concerns the application of flow conditioners. I know they are applied in combination with flow meters, that need a certain straight pipe length upstream and downstream. The purpose is to reduce these lengths. My question is whether there have been developments to...
  9. Yobbo

    L.S., Having searched the inter

    L.S., Having searched the internet for suppliers or manufacturers of swirl tubes I find the entries very few and disappointing. Therefore I would like to appeal to the users of this forum to give me some hints or even detailed information, when possible, about the following problem. At our...
  10. Yobbo

    swirl tube as gas-solid separator

    L.S., Having searched the internet for suppliers or manufacturers of swirl tubes I find the entries very few and disappointing. Therefore I would like to appeal to the users of this forum to give me some hints or even detailed information, when possible, about the following problem. At our...
  11. Yobbo

    application of swirl tube to separate solid rustflakes from a flue gas stream

    L.S., Having searched the internet for suppliers or manufacturers of swirl tubes I find the entries very few and disappointing. Therefore I would like to appeal to the users of this forum to give me some hints or even detailed information, when possible, about the following problem. At our...
  12. Yobbo

    positive displacement pump versus centrifugal pump

    Hi, I would like to start a discussion about the differences and the working range of centrifugal pumps and positive displacement pumps in combination with low viscosity medium like water. The reason for this is that I wonder whether the considerations to choose one or the other might partly...
  13. Yobbo

    Electrostatic Precipitator

    Hi, I would like to get into the details of electrostatic precipitators, because I am confronted with technical questions in this area. What is the right literature if I want to dive into this matter? I hope I am at the right forum with this. Thanking you in advance for your effort. With best...
  14. Yobbo

    Perforated plate as a flow conditioner

    Hi, I am considering to use a flow conditioner in a suction line of a pump in order to equalise the velocity profile in front of the impeller entrance. The need is there, because I am confronted with an ill designed suction line connected to an inline pump. The pump has already a long history of...
  15. Yobbo

    pitot tube pump ??

    L.S., I was a bit surprised learning about the existence of a pitot tube pump. It might even be a worthy adversary of a side channel pump, as I have been told. Can anybody enlighten me about the pros and the contras of a pitot tube pump as I cannot find it in the literature available to me...
  16. Yobbo

    hydraulic pipe calculations in conceptual or basic design phase

    L.S., Somewhere I read an article about how to make hydraulic pipe calculations with limited information during the basic design. It gave some guidelines about how to estimate the amount of bends and other things causing pressure loss based on the pipe length. I don't seem to able to find it...
  17. Yobbo

    Question about finned tubes in a flue gas reheater

    L.S., We apply a few flue gas reheaters with finned tubes in one of our power plants. The fin density is 196 fins per meter. The flue gas in question may still contain some fly ash after passing the E-filter. The reheater is situated after the wet desulphuriser. Therefore the fluwe gas contains...
  18. Yobbo

    Level control in a horizontal cylindrical tank

    L.S., I would like to check a certain feature with others about copntrolling a level in a horizontal cylindrical tank. I have been taught that for level control it is wise to have a certain dead zone around the nominally desired level, so that small deviations will not immediately require...
  19. Yobbo

    Alternative for side channel pump with abrasive medium?

    L.S., I am confronted with a situation, where low flow has to be combined with a rather high discharge head. A side channel pump would be the right thing for this were it not that the condensate (the medium involved) is polluted with a certain concentration of magnetite particles. Those...
  20. Yobbo

    Safety valve underpressure oil tank

    L.S., I am confronted with a challenge to find some kind of safety valve, that keeps the underpressure in an oil tank of a gasturbine within limits. I will clarify the need with the following. In order to return lubrication oil from the bearings to the oil tank an underpressure is being...

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