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  • Users: LesT
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  1. LesT

    Sealing of floor protrusion to concrete foundation

    from API 653: Seal tank floor protrusion to concrete foundation interface after repairs, to prevent moisture from migrating under the tank. Is this common practice? Is this an over kill if under floor leak detection is installed? and a rain lip is installed on the floor protrusion that drops...
  2. LesT

    How Thin is a Thin Plate?

    Not being a FEA user myself, I often questioned the applicability of FEA with thin structures. I was recently confronted with a honeycomb type structure that was modeled with FEA. The 304 Stainless Steel walls of the structure are only 0.08mm(0.003in) thick. Modelled 10 elements across...
  3. LesT

    Thermal stratification on pressure vessels

    Thank you all, most helpfull. The thermal fatigue as required by the code was calculated in our case, but does not seem to address the rate of heating or cooling. Or have I missed it? How significant is it? UCS-56 d,2 eg states a heating rate of 400deg F per hour per inch thickness, for above...
  4. LesT

    Thermal stratification on pressure vessels

    1. Does the code set limitations as to the maximum temperature differences between two points in the vessel wall? other than for heattreatment? 2. And any limitations on the heating or cooling rate? (ie Thermal Shock) Any good reference or guideline in this regard?
  5. LesT

    ASME III ND compared to ASME VIII div 1

    I am looking for a simple comparison of ASME III ND class 3 design requirements with that of ASME VII Div 1. What do I need to do extra for example to a simple pressure vessel designed accoprding to ASME VIII in order to comply with III ND?
  6. LesT

    Helium inflatable pipe plug material?

    We have been using these type of plugs/pipe stoppers from various suppliers for many years, but our regular suppliers do not cater for Helium nor the high temperatures. A lower temperature may be possible in the sealing region but will require active cooling.
  7. LesT

    Helium inflatable pipe plug material?

    I require an inflatable pipe plug for temporary sealing a 1m diameter pipe pressurised with 1 bar Helium at about 350 deg C or lower. Can someone point me in the right direction for a possible supplier or recommend some materials to use. Permeability tables of Helium at these temperatures for...
  8. LesT

    Helium permeability through PVF, Nitrile, Silcone at 350degC

    I require an inflatable pipe plug for temporary sealing a 1m diameter pipe pressurised with 1 bar Helium at about 350 deg C or lower. Can someone point me in the right direction for a possible supplier or recommend some materials to use. Permeability tables of Helium at these temperatures for...
  9. LesT

    Pipe plug for Helium?

    I require an inflatable pipe plug for temporary sealing a 1m diameter pipe pressurised with 1 bar Helium at about 350 deg C or lower. Can someone point me in the right direction for a possible supplier or recommend some materials to use. Permeability tables of Helium at these temperatures for...
  10. LesT

    Cutting device for seal welded instrument connections?

    Some of our instrumentation is screwed in and then seal welded onto nozzle. For many years we have used a manual device that clamps around the joint and with a small cutter insert, the seal weld is manually cut way by turning the clamp. A TIG weld totch can also be attached to this device. It...
  11. LesT

    Sensitization of 316L relative to weld heat input.

    Thanks for the input. Due to the critical application of the work piece, the client insists on sufficient proof that no sensitization will occur. In this case one way to satisfy the client will be to make a test piece simulating the weld configuration, cut it up and test for sensitization, or...
  12. LesT

    Sensitization of 316L relative to weld heat input.

    I would like to obtain some kind of comparitive data indicating the relationship of sensitization of 316L with various amount of weld heat input. Does anybody know where I can obtain such info?

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