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  1. DSTankee

    Frangibiliy Requirement for Dome Roof Tank

    I agree with JStephen. The maximum pressure equation provide a result dependent on the configuration of the roof to shell joint, however Annex F defines a hard ceiling on the limits of the ratings of the tank. This just means your configuration may be slightly over designed, however this may not...
  2. DSTankee

    Hello folks, My contractor done

    Have they submitted a WPS for their SMAW procedure. If their SMAW procedures satisfy all the required essential variables per ASME Section IX, why not let them use it? (unless the job was bid T&M without a NTE number, them that may have been an error to accept such a bid) **Edit to clarify that...
  3. DSTankee

    Hydro Test Exemption with Door Sheet Cut to Bottom

    @HTURKAK & @IFRs, Thank you both for you feedback.
  4. DSTankee

    Hydro Test Exemption with Door Sheet Cut to Bottom

    @HTURKAK, I have API 653 5th Edition, Addendum 2 (May 2020). Below is a link to the section 12 hydro static testing exemption requirements. I am familiar with the practice of slotting the shell that you mentioned. Whereas we have also install leak detection and liners above the existing bottom...
  5. DSTankee

    Hydro Test Exemption with Door Sheet Cut to Bottom

    @HTURKAK, I suppose the lingering question is what is the API committee's intent for paragraph 12.3.3.3.8 restricting the verts of the door sheet from extending to the bottom when no such restriction is place on butt welded inserts or shell replacement at the lowest shell course. Or am I missing...
  6. DSTankee

    Frangibiliy Requirement for Dome Roof Tank

    @James Bonding, you're correct. In my previous reply I had intended to refer to subparagraph c and d based on the diameter of your tank (subparagraph b refers to self-anchored tanks diameters 9m to 15m). My apologizes, I shall edit my post to correct the mistake to avoid any confusion for any...
  7. DSTankee

    Hydro Test Exemption with Door Sheet Cut to Bottom

    API 653 repair scope to an asphalt storage tank includes a bottom replacement and some nozzle relocation (the shell surrounding the nozzles were cut so that the nozzles would be installed as inserts maintaining the same centerline elevations with respect to the new bottom). As there was heater...
  8. DSTankee

    Frangibiliy Requirement for Dome Roof Tank

    Frangibility per API 650 13th Edition is determined by 5.10.2.6. Due to the size of your tank, we should refer to either subparagraph b or c c or d (depending on whether or not the tank is anchored). Regardless each set of requirements will state that the the tank shall satisfy the requirements...
  9. DSTankee

    Frangibiliy Requirement for Dome Roof Tank

    Your client is correct in that the intent of a frangible roof is to design a weak joint above the product line in an emergency over-pressurization event, rather than risk the failure occurring lower on the tank resulting in a loss of product. However, if the roof-to-shell joint is arranged per...
  10. DSTankee

    Choosing the correct thickness from Table 5.7b of API 650

    Column 1 of Table 5.7b of API 650 contains a list of thicknesses of Shell and Reinforcing Plates (t and T). Is this intended to mean the sum, minimum, or maximum of the two thicknesses? For example; A tank shell is constructed with a thickness of 1/2" and contains a reinforced shell opening for...
  11. DSTankee

    ASME XIII-I Vessel Material Marking

    Hello All, I am stepping into a project nearing completion and have I have a concern regarding the material tracking that has been done to this point. This is a ASME Section VIII-I vessel (to this point I have mostly dealt with API tanks, so this is a new to me). This is a horizontal vessel...

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