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Recent content by Orakel

  1. Orakel

    Evaluation of existing shell patches

    OK, so here is a picture of an example of a patch installed on the lower shell course, used to close former shell openings of 2 in. I don't have pictures of the internal side, but the inside is welded as well. This patch LxWxt = 1200x200x25 mm, installed on a shell thickness of 19.4mm In...
  2. Orakel

    Evaluation of existing shell patches

    Correct. But you can evaluate existing patches under 9.3.1. My interpretation comes from the last sentence in clause 9.3.1: Lapped patch shell repairs are an acceptable form of repair for butt-welded, lap-welded, and riveted tank shells, under the conditions outlined in 9.3.2, 9.3.3, and...
  3. Orakel

    Evaluation of existing shell patches

    IFRs, thanks for sharing your view on this. I agree that the thickness is not the only aspect to look at and other factors must be considered as well. True, the tank owner wil be responsible at the end of the day, but correct interpretation of the inspection code (where owner's decisions are...
  4. Orakel

    Evaluation of existing shell patches

    Thanks HTURKAK, I do understand the conditions outlined in 9.3.1.1 through 9.3.1.10. I don't want to install a patch, but let's say I'm mister API653 inspector and I inspect an AST at a client and I see a square patch with rounded corners of 10x10 in. with a thickness of 3/4 in. , installed on...
  5. Orakel

    Evaluation of existing shell patches

    Hi All, I have a question regarding evaluation of existing patches installed on shell courses, during an inspection according API653. As mentioned in API653 section 9.3.1 'These requirements may be used to evaluate existing lapped patch shell repairs; however, the plate thickness limits need...
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