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Eingeladener Vortrag
- nein (34)
Forschen für die Sicherheit
(2013)
Vergleich von Risiken
(2013)
Vielen Entscheidungsprozessen geht ein Vergleich voraus. Bei einem Produktvergleich werden dazu Kriterien festgelegt, etwa der Kaufpreis, die Güte, Haltbarkeit, Handhabung usw. Der Testsieger ist meist derjenige, der die am höchsten bewerteten Kriterien erfüllt. Voraussetzung für derartige Vergleiche ist also die Gleichartigkeit der Vergleichsobjekte. Risiken untereinander zu vergleichen ist komplizierter. Die Notwendigkeit von Risikovergleichen ergibt sich, wenn nur unklare Vorstellungen, z. B. über die Risiken einer neuen Transporttechnologie, existieren und keine Erfahrungswerte zur Verfügung stehen. Aus bekannten und akzeptierten Risiken soll mittels eines Vergleichs die Tolerierbarkeit eines (noch) unbekannten Risikos abgeleitet werden. Der Beitrag setzt sich mit der Problematik von Risikovergleichen auseinander.
Daten über Schadensursachen und die tatsächliche Nutzungsdauer der Tanks zum Transport von Gefahrgütern liegen nur in begrenztem Maße vor. Auf der Basis der Daten von Tankbaufirmen, Speditionen und Eisenbahnkesselwagen-Vermietgesellschaften wurde die durchschnittliche Lebensdauer von Tankcontainern, Tankfahrzeugen und Kesselwagen zur Beförderung von Gefahrgütern in der Praxis ermittelt und die Hauptschadensursachen analysiert. Korrosion, Risse an Schweißnähten, Gestaltungs- und Dimensionierungsfehler sowie fertigungs- und betriebsbedingte Fehler zählen zu den Hauptschadensursachen. Viele Tanks werden vor Ablauf ihrer Nutzungsdauer nicht mehr für den Transport von Gefahrgütern eingesetzt, da sie nicht mehr den geänderten gesetzlichen Anforderungen in den Gefahrgutvorschriften entsprechen. Die Voraussagen durch Literaturangaben und Ergebnisse von Korrosionsversuchen in der BAM-Liste – Anforderungen an Tanks zur Beförderung gefährlicher Güter – spiegeln sich in der Nutzungsdauer/Lebensdauer der Tanks wider.
Use of higher-alloyed metallic materials and duplex steels for transport tanks of dangerous goods
(2011)
Compatibility evaluations of selected metallic materials under the influence of dangerous goods are published in the BAM-List - Requirements for Tanks for the Transport of Dangerous Goods” as basis for substance-related prototype approvals for tank Containers designed for the carriage of dangerous goods.
There is a request of the tank manufacturing industry and transportation Companies to incorporate additional materials into the BAM-List, especially corrosion-resistant materials because of the large number of corrosive dangerous goods. One solution to solve corrosion Problems is to line the tank with a polymer, an alternative solution is the application of high-alloyed stainless steels and nickel-based alloys as there are 1.4529 (XINiCrMoCu 25-20-7, alloy 926), 1.4562 (X1NiCrMoCu32-28-7, alloy 31) and 2.4605 (NiCr23Mo16AI, alloy 59).
There is an interest to use cost-efficient steels with high strength values and concomitant adequate corrosion resistance such as duplex steel 1.4362 (X2CrNiN23-4).
This steel grade was originally developed as a substitute for the austenitic grades 1.4404 (X2CrNiMo17-12-2) and 1.4571 (X6CrNiMoTi17-12-2). Due to the lower content of the alloy elements nickel and molybdenum this duplex steel is a cost-efficient alternative to molybdenum containing austenite.
Due to the limited number of corrosion test results with welded test samples of these high-alloyed materials and the duplex steel under the influence of corrosive dangerous goods a comprehensive test Programme was performed with these materials in Cooperation with ThyssenKrupp VDM and Deutsche Edelstahlwerke GmbH. It can be concluded from the test results that the superaustenitic steels 1.4529 and 1.4562 as well as the nickel-based alloy 2.4605 are a really good alternative as tank materials for the transport of dangerous goods in comparison to the lining of the tanks. The nickel-based alloy 2.4605 shows the best resistance and is suitable as material for tanks transporting all tested corrosive substances. One exception is the temperature limit during the transport of hydrochloric acid.
The superaustenit 1.4562 is a resistant material with a wide ränge of application. Exceptions for use are: ammonium bifluoride, brine, 34 % calcium Chloride solution, hydrochloric acid, perchloric acid, 90 % 2-chloropropionic acid, nitrating acid with nitric acid content > 50 % and molten monochloroacetic acid. The alloy is limited suitable for allyl Chloride, aluminum Chloride, copper (II) -Chloride and ferric Chloride. The superaustenit 1.4529 showed the lowest resistance compared to the other two materials. This steel is not resistant in hydrochloric acid, perchloric acid, sodium Chlorite and sodium hypochlorite. The application is limited in the concentration ränge of aqueous Solutions of aluminum Chloride, copper (II) Chloride and ferric Chloride. Due to the reduced alloying content of the duplex steel 1.4362 (X2CrNiN23-4) compared to the austenitic CrNiMo-steels, a lower resistance especially in acidic media like formic, acetic or sulfuric acid was observed. Within the more than 7.000 substances contained in the BAM-List there is a large amount of dangerous goods such as hydrocarbons, alcohols, aldehydes, ketones, ethers, esters, and inorganic alkaline substances which have a large transport volume and do not corrode the duplex steel 1.4362 (X2CrNiN23-4).
The test results are included in the actual 11th edition of the BAM-List and therefore available for the costumer.
Rückendeckung
(2013)