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  • Users: Yobbo
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  1. Yobbo

    Minimum pitch temperature

    Thanks EmmanuelTop, IRstuff and georgevergese for your replies so far. I realise I made a mistake with the title and in my text. Indeed it is "Pinch temperature" instead of "Pitch temperature". I do understand the general concept of the pinch temperature. Choosing a minimum pinch temperature in...
  2. 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...
  3. Yobbo

    Steam lines in publicly accessible areas

    Thanks for the answers. First I realise that I hadn't mentioned temperature and pressure. It is superheated steam with a pressure of 8 bar abs and a temperature of 195 Celsius (374 Fahrenheit). I think the local regulations and societal culture is very determining for the right way of running...
  4. 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...
  5. Yobbo

    Steam/steam generator

    Thanks for your reactions. I have to say that some of the given solutions still involve the direct use of our process steam for exporting to a costumer. As I think I mentioned due to the fouled return condensate from the costumer this option is out of the question, unless great effort is being...
  6. 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...
  7. Yobbo

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

    Thanks Xnuke, I will try to get a hold on this book. I did look at the index, but I couldn't make out whether this subject is in there. Karel Postulart, The Netherlands Nuon Power Generation
  8. 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...
  9. 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...
  10. Yobbo

    constant force mechanismsHi

    Hello Timelord, Thank you for your reply. As a matter of fact I will visit the dentist next week for the semi yearly check. I will look at the X-Ray machine differently. The assumption of the constant force requirement seems to be too strict, reading about your solution. I will consider the...
  11. Yobbo

    constant force mechanismsHi

    Hello Drawoh and Desertfox Thank you for your responses. Constant force is an ideal situation. Small deviation from this concept is allowable, but the final mechanism should in all cases be able to bear the weight of the flat screen and not change the position of the item after being released...
  12. 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...
  13. 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...
  14. 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...
  15. Yobbo

    swirl tube as gas-solid separator

    Thank you, Tickle and chief, I forwarded my question already to both mentioned companies. I did try to contact quite alot of companies already but somehow they are weary of diving into this matter, whereas I assume I amnot the only one battling with this kind of problem. Greetings Karel...
  16. 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...
  17. 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...
  18. 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...
  19. Yobbo

    positive displacement pump versus centrifugal pump

    Hello everybody, I seem to have unleashed a lifely discussion. First I want to thank all for their reactions. I have a few remarks though. I read some conflicting statements about the efficiency of the PDP versus the CP. I agree with Curtis26 that a PDP has intrinsically a better efficiency...
  20. 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...

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