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  • Users: lukem
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  1. lukem

    Inflatable plugs for pipe isolations

    Hello, I need to isolate a gas main so we can enter a pressure vessel for cleaning. The gas is blast furnace gas at atmospheric pressure and approx 40deg Celsius. There is no position for a slip plate, but I have heard of inflatable balloons being used to isolate a main temporarily. The main I...
  2. lukem

    Dust buildup removal in tank

    I work in a blast furnace and we are currently having a lot of trouble removing dust buildup from the inside walls of our dustcatcher (a large pressure vessel where dust is removed from the dirty gas off the top of the furnace). The dust has a high iron content, and we only have limited windows...
  3. lukem

    Allowable shear stresses in shafts

    When designing a hollow circular drive shaft, what is the allowable shear stress in the shaft? How does the allowable shear stress relate to UTS or yield strength of the material (in this case 304 S/S)? Is it correct to say that the allowable shear stress is independant of cross section because...
  4. lukem

    Pressure vessel repairs

    I have a small (3m^3), low pressure (8kPa) vessel that is badly corroded. In the past when vessels have corroded through (pin holed), we have been able to weld a socket over the pin hole and seal it that way. In this current situation, the wall thickness is too thin (below 3mm from a design of...
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