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Recent content by Raai2015

  1. Raai2015

    Book Suggestion

    Hallo can anyone suggest a book for the starter to study on Welding on structural steels (Bemas..)Thank you verymuich in Advance°!
  2. Raai2015

    Static head in Hydrotest in Horizontal position

    As per EN12952-3 ; if the static head is less than 0,5bar than it shall be neglected!
  3. Raai2015

    Fluid dynamics - Header pressure

    ione: It is clear , appreciable if any Body could derive!i have tried and failed!
  4. Raai2015

    Fluid dynamics - Header pressure

    chicopee.Offcourse this is Bernaoullis
  5. Raai2015

    Nozzle opening limitations per EN13445

    Justbplay with the thk, i think you can get away!
  6. Raai2015

    Header Pressure balance

    Hallo all, its about the Header pressure derviation. I didnt understand the derivation on the red mark (Massflux term) in the picture. If anybody can clarify would be helpfull. https://files.engineering.com/getfile.aspx?folder=7a698ca4-6b74-4ee3-9f80-23480c877cf6&file=Header_Pressure.PNG
  7. Raai2015

    Watertube Boiler Question

    @ Davefitz. Agreed. If i understand the Question correctly '' Is there a type of water-tube boiler which has its steam drum or water drum exposed to heat (either radiation or convection)?'' the Answer is 'Yes' . to my Knowledge not by Radiation but by Convection - and not in the power...
  8. Raai2015

    Fluid dynamics - Header pressure

    @ Littleinch : Yes tubes are mostly equal spaced. For the Derivation we can assume equally spaced.but by Chance can you derive? I am also going to post this is in Boiler group.
  9. Raai2015

    Watertube Boiler Question

    @ Davefitz , if i remember correctly , most of the Bi-drum Boiler (Industrial Boiler)Bottom of the top drum is in the flue gas path??Further Ligament effeciance is much small in the range of 45-60%
  10. Raai2015

    Fluid dynamics - Header pressure

    Sorry if the attachments is missed!https://files.engineering.com/getfile.aspx?folder=a3ed0f77-4b5c-473d-b26d-ddad8331d515&file=Header_Pressure.PNG
  11. Raai2015

    Fluid dynamics - Header pressure

    Hallo all, its about the Header pressure derviation. I didnt understand the derivation on the red mark (Massflux term) in the picture. If anybody can clarify would be helpfull.
  12. Raai2015

    Boiler drum and Ends with different material!

    @Kingero : Ja, we have the full time specialist. Ist for me to have th Basic understanding!
  13. Raai2015

    Boiler drum and Ends with different material!

    Hi guys, finally i could find the PWHT temperatures in EN 12952-5. Thanks for the replies!
  14. Raai2015

    Boiler drum and Ends with different material!

    Hi Kingnero : We have the weld expert who takes responsibilities of this stuff. This weld consumables are written down in the pressure püart drawing. i would like to understand this stuf! WB36 ; Cu = 0,50-0,80
  15. Raai2015

    Boiler drum and Ends with different material!

    Hallo all , anyidea where can i find the filler material (weld metal) for this dissimilar weld? May be an european norm reference would be acceptable! Many thanks!

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