In a seperate chapter we will take a closer look at trimaran motion in waves, since this aspect is particularly relevant to security.
    Doubts could arise about the safety of the hydrogen storage tanks. Yet hydrogen gas is only flammable or explosive when mixed with air or oxygen. This can, however, not occur within the pressure vessel. Should a pressure vessel or hose develop a leak, due to its light weight the hydrogen will immediately escape
The safety philosophy pursued here is based on the principle of giving way to natural forces or at least  resisting them as little as possible. By way of illustration, we compare the Eco- Trimaran with a “semi-submerged catamaran or  “Small Waterplane Area Twin Hull” (SWATH), which reflects an entirely contrary philosophy. The semi-submerged catamaran (seen from the front in the illustration) has two long, streamlined floats which are each joined to the main hull by a narrow “neck”. The “neck” spans almost the entire length of the float. The amount of buoyancy is calculated so that the floats remain in deeper water below the waterline, out of the reach of waves. This makes the vessel stand “as firm as a rock” even in rough seas. Mechanical stress results from the interaction of forces between the submerged floats, which act as “fixed  points”, and the main hull, which is exposed to environmental forces. The Eco-Trimaran, in contrast, offers only little resistance to wind and waves. Both can simply flow past it, even under the main hull. The tubular float axles located there are only a minor obstacle. The floats hardly protrude above the waterline, so that breakers are able to roll past them. And since the floaters are movable, they are able to adapt to the particular wave and current conditions.
   To answer the question of whether the Eco-Trimaran’s movable components enhance safety more than detract from it, it is helpful by way of comparison to refer to the suspension of land vehicles. Even though a suspension system requires additional engineering effort, it reduces stress on the materials used in the structure as a whole and so enhances safety. Or, conversely, without a suspension system, the parts of the body supporting loads would have to be designed more strongly and more heavily in order to achieve the same level of safety.
upward. If the spaces in the ship where the pressure vessels are stored have vents opening upward which are always open, no hydrogen gas can collect inside the hull (refer to the hydrogen safety report on this point ).
    The following can be said about the risk of the pressure vessels bursting as a result of the high pressure (700 bar): first, it is planned to distribute storage volume among a number of individual tanks. Second, the vessels are to be fitted with a jacket of carbon-fibre composite material. This absorbs pressure and, in the event of damage, would prevent the metal tank inside from flying apart in fragments. Such damage would only shred the fibres and the gas would escape gradually. This is also important, insofar Hydrogen gas gets warm by decompression; this is limited by slowing down decompression process.
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