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  1. skasliwal

    How to install top exchanger of a stacked unit

    Wondering if someone here can suggest the proper way to install the top unit of a stacking. As of now, with the top exchanger plumb, only one of the interconnecting nozzles connect properly with 1/8" gap for gasket insertion. The other tubeside interconnecting Nozzle flanges read 0.32" @0°...
  2. skasliwal

    Pneumatic test of Piping with pressure vessel as a System

    Thanks MM for your response. Yes the pipe is attached to vessel by welding and as such 100% UT/RT of the closure joint per para 345.2.3(c) of ASME B31.3 to qualify/test the joint. I was trying to confirm if the joint meets the definition of "Closure Weld". Secondly, if one were to argue...
  3. skasliwal

    Pneumatic test of Piping with pressure vessel as a System

    Guys, I am trying to confirm if para 345.4.3(b) of ASME B31.3 "Hydrostatic test of Piping with vessel as a system" applicable to Pneumatic testing as well. My situation is relief valve and the associated piping is rated for a much higher pressure compared to the pressure vessel it is...
  4. skasliwal

    Monel Casting ASTM A494-M-35-2

    Thanks Metengr for your post. This is exactly what I was looking for. I amooking to design a bonnet for my unit and I believe aforementioned codecase will make the use of ASTM A494-M-35-2 casting suitable for this application. I couldn't find the 1750-20 code case in my department liabrary but...
  5. skasliwal

    Monel Casting ASTM A494-M-35-2

    I was wondering if anyone has any experience using ASTM A494-M-35-2 casting in a ASME section VIII Div 1 application. where can I find the allowable stresses at different temperatures? Do I need to get it dual certified to a diffrent spec since its not listed in 2-D? Any help is appretiated.
  6. skasliwal

    Re-Rate, Alteration, Applicable Rules

    Montemayor: So you were in junior high school in 1955, so was my dad. Guess I couldn’t be blamed either. Anyways, I do agree with you, that the equipment is being re-rated in the present time, so the present code must be applicable. But the thing is, since its a pre 1968 exchanger, I have to...
  7. skasliwal

    Re-Rate, Alteration, Applicable Rules

    Guys, I have referred a lot of literature on the issue but my problem remains to be unsolved. I am rerating a few exchangers built back in 1955 to a higher shell and tube side design pressure. To my understanding I can use the code effective at that time along with the old stess values for...
  8. skasliwal

    U-TUBE TUBESHEET

    picasa, First of all, beginning this year Tubesheet design per ASME Sec VIII, Div 1 - UHX has become mandatory. In other words I wouldnt even bother designing TS per TEMA. Again, Its true that tubesheet are not typically designed for differential pressure as the thickness arrived at letting...
  9. skasliwal

    Centering Ring on A GMGC gasket !!!

    This might sound a bit strange. I have a customer spec. that calls for an outer centering ring on GMGC gasket. From my experience in heat exchanger design, I havent come across a situation where a GMGC gasket has a centering ring. I know ofcourse that this is a requirement for a spiral wound...
  10. skasliwal

    Design for external pressure

    Can somebody suggest the procedure to carry out external pressure design for temperatures outside the range of External presssure chart. I have design temperature of 1130° F and the yeild stress values are not listed at such high temperatures in 2-D. I believe that is what is causing the...

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