Design code for PE storage tanks is ASTM D1998-97. All of our tanks are manuf to this ASTM; both crosslinked polyethylene and linear poly.
Our spec for single wall tanks is online at www.kefco.com/KEFSpec.html
Our spec for double wall tank ass'ys is also online
www.kefco.com/uptspec.html
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I have supplied numerous chemical storage tanks. Sodium hypochlorite is indeed the "Tankman's best friend." Due to changes in PE formulation and processes, PE is now the best "bang for your buck" for storing NaOCl. Cleanliness of the system is of the upmost importance...