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Composite Tank Repair – API 653 vs PCC-2

Explore the key distinctions between API 653 VS PCC-2 standards in tank repair. PCC-2 focuses on material testing, including tensile properties and bond adhesion, with a minimum of five specimens. In contrast, API 653 demands more rigorous criteria, requiring at least 20 samples to ensure a 99% confidence level in material design values. This difference underscores API 653’s commitment to safety and reliability in repair materials. Both standards also include burst and pressure tests to evaluate repair systems’ capacity under extreme conditions, showcasing the thorough approach to maintaining tank integrity. 

PCC-2 outlines the material testing that’s required to qualify your system. So these are things like tensile properties of resins, tensile properties of the composite, lab shear shear modulus, Bond adhesion, things like that. Well, for API 653, instead of having a five specimen minimum for testing, the committee wanted at least 20 samples. And that’s because they wanted at least a 99% confidence level in the design value of the material. So if you’ve done PCC to qualification testing, you’re going to have to do additional tests to show that you have at least 20 samples. In addition to the material side, we still do the burst tests, so 8539, ISO 24817 and ASME. PCC to have our outlined pressure tests, where you can demonstrate the pair system’s ability to handle pressure if let’s say your wall loss is 80%. We also do the same level of testing for energy release rate, which is that value that you achieve when you test the carbon fiber over a three wall defect 

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