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Recent content by Tj01

  1. Tj01

    Passing or leaking valve in H2SO4 service

    Hi Guys, I have an issue with an H2SO4 manual isolation valve (block) upstream of an automated valve. The Automated valve controls H2So4 supply to the H2So4 scrubber vessel. Trouble is that this manual valve is not operated regularly and during the maintenance of the automated valve, it does...
  2. Tj01

    Caustic soda storage tank corrosion allowances

    Mates, I am designing Caustic soda storage tanks to API 650. The concentration for caustic soda is going to be as high as 50%. Initially for corrosion allowances, I have kept corrosion allowance 2mm. As this are caustic soda tanks and concentration of fluid can go up to 50%, I am bit worried...
  3. Tj01

    What is difference between SA 516 60 & SA 515 60

    Hi Joshi! Agreed with you regarding grain structure. But, for the temperature purpose, it should be other way, like Sa 515-60 can be used for intermediate to higher temperature purpose(specifically boilers) and SA516-60 is used for lower to intermediate temperature purpose(specifically for...
  4. Tj01

    appendix 13 issue

    Hi, I am currently verifying design of HE based on Appendix 13 and 13-14(external pressure check) I have literally problem to understand terms used in this appendix. The HE cross section is same as figure 8. And i am very much confused with the terms like "inside length of long side of...
  5. Tj01

    SA 312 TP 304L pipe stress value

    Hitesh, Generally speaking,If you are using seam less pipe, than the weld efficiency factor will be 1 and hence the allowable stress value will be higher than that of welded pipe. Here in the second case if you are using welded pipe your max allowable values will be lower. Hence, As SnTMan...
  6. Tj01

    Installing 10" Nozzle through 22" manway...reinforcement calc?

    1.) Yes. The t (thickness) should be exactly same as it is in real for non std flange and non std flange. 2.) No. The joint efficiency factor is welding joint efficiency of pipe to blind flange. This factor ranges from 0.5 to 1.0 depending up on welding joint. Hence please refer Table UW-12 for...
  7. Tj01

    Minimum specified distance between two welding joints

    Hi guys! I have a toris. head having cladding ring on the taper. The distance between welding line of cladding ring to shell-head welding line is 0.315 in. Head thickness 0.188 in and Shell thickness is 0.105 in. Material is As 240-304. My question is " Is there any code limitation that...
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