PROOF OF THE CORROSION-RESISTANCE OF TANK MATERIALS WITH REGARD TO WATER-POLLUTING INFLAMMABLE AND NON-INFLAMMABLE STORAGE LIQUIDS BY EVALUATING CORROSION DATA

The general protection requirements and arrangements determine in rega rds to the anxiety principles of the water conservation law a respecti ve construction and observation of the storage tanks with the storage of water pollution liquids. The proof of the corrosion resistance of t he tank materials in relation to the long-term influence of the storag e liquids belongs to the general protective arrangements. Suppositions for the proof of the corrosion resistance are the definition of the u sed materials, welding seams and liquids. Liquid-materials-combination s are evaluated as qualified when the decrease of the wall-thickness c aused by uniform-corrosion does not exceed 0,1 mm per year and local c orrosion in form of pitting corrosion or stress corrosion is not expec ted. In the DIN 6601 which includes the socalled positive-liquid list are evaluated water-polluting liquids in regards to their material res istance with carbon steels and austenitic stainless steels at a temper ature of max. 30-degrees-C on the base of relevant literature, user ex perience of producers or users over a time of min. five years and labo ratory tests. The positive testify is only valid for a lot of liquids if special conditions related to liquids or related to the working con ditions are fulfilled. For liquid-materials-combinations not mentioned in the positive-liquid list is the proof of the corrosion resistance through separate expert opinion necessary.