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  1. QMax1

    Welding of steam tracing to tank cone

    The best heat transfer coumpounds out there are terrible conductors...but they're better than air. When applying to pipe on a vessel, you will see a some improvement over nothing at all. Trouble is it may not last very long. You will want to capture the HTC somehow so it will be a longer term...
  2. QMax1

    Molten Sulfur Trench

    Amiraz, Most folks who offload sulfur are using jacketed hoses or jacketed arms that feed into a common header. I would consider your situation unique. Probably the most efficient and effective way to do this is a method that is not a regular practice anymore in sulfur industry(gut trace)...
  3. QMax1

    Steam Jacketted Check Valve

    Deepak, "Full Jacket" typically refers to oversizing the valve when the jacket is fabricated to the valve. For example, a 3" valve becomes a 3" x 4" fully jacketed valve by removing the 3" flanges and welding 4" flanges (bored for 3"). After that, a "full jacket" is welded to the entire body...
  4. QMax1

    Heat Transfer in Tank Using Hot Water Pipes

    Sorry, that U should be 60 BTU/hr ft^2 F so the time should be more like 100 hours.
  5. QMax1

    Heat Transfer in Tank Using Hot Water Pipes

    To get the heat required, you use Q = m Cp dT. Assuming your process is water (Cp = 1), you will need over 20MBTU input into the process. To get the heat given, you use Q = U A dT. U between two water boundries and a layer of pipe is about 6 BTU/hr ft^2 F (limited by your tank water). Given...
  6. QMax1

    Corrosion of Aluminum part inside Liquid Sulfur Tank?

    I am designing a component that will be submersed in liquid sulfur inside of a storage tank. The component will remain submersed for years at a time. It will also, at times, be exposed to the air space above the liquid level which will contain H2S. I would like to make this part from...
  7. QMax1

    Thermal Cond. for A319 Cast Aluminum

    I've been feverishly searching for the Thermal Conductivity of A319 Cast Aluminum. I'll take it in any units I can get. Thanks in advance!
  8. QMax1

    Heat Transfer Finite Difference Modeling

    DanStro - Thanks for the leads. I'll check these out. Sailoday - trying to model heat transfer from a steam tracer around a pipewall and into process (all inside insulation). Just looking for 1-dimensions right now, but it would need to be multi-layered to account for the various film coefs...
  9. QMax1

    Heat Transfer Finite Difference Modeling

    I'm looking for a program that models the temperature profile around a pipewall and into the process with a heat source at one point. I would need to be able to easily vary the pipe diameter, thickness and size and temperature of the heat source. I've done some research and have found some...
  10. QMax1

    Triple Off set Butterfly Valves

    For your first question, check out the following thread: http://www.eng-tips.com/viewthread.cfm?qid=126483 For your second question, it is my understanding that triple offset valves are used in applications where low-leakage is a must and gaskets are not practical. High temperature gases...
  11. QMax1

    Convective heat transfer coefficient for air

    Depending on your conservative slant, I would say 1 BTU/hr ft^2 F is a safe bet for free convection of air. If your conservative slant is at the high side, I think the 5 BTU/hr ft^2 F is a good number. Depending on what you are calculating, you may not need to use any formulas.
  12. QMax1

    Known and potential causes of sulfur pit fires

    SREisme, I would suggest you contact someone like Sulphur Experts or Aberta Sulphur Research for a comprehensive view of these problems. I can confirm that iron oxides can cause creation of pyrophorics which can lead to sulfur fires. The iron oxides are created when sulfur freezes on a...
  13. QMax1

    Coils to cool Tank Product

    lgarcia1800, You have almost everything you need. You first have to determine whether you are going to let ambient conditions into this formula. For example, if the process is sitting in a vessel during cooling, we need to consider the temperature outside and whether that is working for us or...
  14. QMax1

    Aluminium/Stainless steel extrustions

    DoodleBread, I have experience with Aluminum shapes, but not stainless steel. If you can not find existing shapes, it normally runs between $700 to $800 to make the initial dye (assuming you make the drawing). Then, extruders have minimum runs of hundreds of feet. You're probably looking at...
  15. QMax1

    Re the sulfur tank roof corrosion

    1906, I think you are better served by contacting the author (CSI). I normally deal with Tom Perry who handles the Northeast.
  16. QMax1

    Re the sulfur tank roof corrosion

    1906, Most internal corrosion of sulfur tanks is due to wet sulfur corrosion on the inside wall of the tank (S trapping H2O). If the tank wall is not properly heated (which normally they are not), there will be areas of the tank (particularly the roof) that are below the freezing point of...

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