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  1. millsjj

    Donut Shaped Pressure Vessel

    @GenB, yes the two parts are welded together in compliance with Div IV of ASME, Heating Boilers. Can you specify why you cannot calc as inner and outer? My approach is to consider the end with the opening for the piping as a tube sheet with stays, then the external wall as standard pressure...
  2. millsjj

    HG-346 Tube Sheet with Firetubes and Stays

    Hi, I am currently reviewing the design of a tube sheet for a boiler that is made from stainless steel and has stainless steel piping welded to it. This falls in line with subsection HG-346 of Section IV of Asme which allows me to calculate the required thickness of the plate, which I have...
  3. millsjj

    Test Vs Working Pressure

    Hi, This is a very entry level question but when doing the pressure calculation for a pressure vessel based on ASME, should I be using working pressure or Hydrotest pressure for my calcs? Not sure if the calculations factor in the allowance for the hydro or if that should be my value for the...
  4. millsjj

    Plain Tubing Vs. Fin Tubing

    The flow of cold water will be intermittent and will for extended periods have no forced circulation.
  5. millsjj

    Plain Tubing Vs. Fin Tubing

    Hi dbill, Any chance you could elaborate further on your opinion as to why you don't see a benefit? I have been looking around and seen that fin tubes are used in water heat exchangers commercially but they dont seem to be the norm. This may be what you're eluding to in that it is not an...
  6. millsjj

    Plain Tubing Vs. Fin Tubing

    Hi Guys, Thanks for the responses. To shed a bit more light the heat transfer is for hot water to cold water inside of a tank with hot water flowing through the pipe in question. I understand that it is not just a case of matching sq. footage, as the fins cannot be treated as direct heat...
  7. millsjj

    Donut Shaped Pressure Vessel

    Hi Guys, Sorry for the typo on 'wholes' that chicopee so readily pointed out. The 'holes' are to accommodate piping that will be welded in place. They go through one side as they function as an inlet whilst there is a single outlet on the top of the component. This will have 4" piping welded in...
  8. millsjj

    Plain Tubing Vs. Fin Tubing

    Hello, I am currently investigating the redesign of a heat exchange unit that uses SS helical coil for heat transfer purposes. One avenue of investigation I am reviewing is to use fin coils instead of the standard 1.25" tubing to reduce the overall length of the required coil whilst giving...
  9. millsjj

    Donut Shaped Pressure Vessel

    Hi, I am currently designing a pressure vessel system for hot water with a max temp of 99C and operating pressure of 160psi. The part is shaped like a donut with wholes through one face to allow for hot water piping to be welded as this unit will be part of an outlet manifold. I am double...
  10. millsjj

    Pressure Difference due to Altitude

    Mate, If I could do all of this out and explain it properly I wouldnt be asking here. All im looking for is a simple answer to a simple question. Yes you have stated that the pressure will be greater at the bottom, as I already believed, but I just want it spelt out so that it can universally...
  11. millsjj

    Pressure Difference due to Altitude

    Thanks for the response BigInch. I am aware that natural gas is not a non-compresssible fluid but for simplicity of this exercise we chose to treat it as such. That equation is not the full version of Bernoulli but that is what it can be worked down to when the fluid is static. The velocity...
  12. millsjj

    Pressure Difference due to Altitude

    Hi All, Want to bring this back to basics for a minute. I work for a gas company and someone came in with a simple question. A sealed pipe of natural gas rises 100m. the pressure at the bottom is 3kPa. What is the pressure at the top? I believe the pressure is less due to Bernoulli's...

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