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Calculated safety

A huge variety of different forces may be acting on tanks. Not only snow loads, storms or earthquakes are risks, but also the tank's actual contents have to be accurately calculated, so as to rule out unforeseen problems as far as humanly possible.

If, for example, a customer orders a tank for an earthquake-hazard area, then GROSS has to design this tank for the earthquake hazard category concerned.

The tanks' statics are calculated with maximised accuracy. For earthquake-responsive statics, however, the major focus of attention is not on the tank itself, but on its stability. The largest weight rests on the substructure, on the support frame with support ring, or on the feet, because it's there that the most problems may be encountered during erection.

Finite element analysis
The use of computer-aided finite-element analyses enables these load cases to be calculated during the course of design testing. Colour-coded problem zones are used in 3D depictions to render any weak points immediately visible.

The tanks' statics can then be checked:
1. Statics certificate (stability certificate)
2. Verifiable statics (A state-approved statics expert verifies the static
    measurements )







Mercali or Richter?

C. F. Richter

The Mercalli scale – named after the Italian volcanologist Giuseppe Mercalli (1850 - 1914) – was until 1935 the customary measuring scale for determining earthquake severity. It classified earthquakes into 12 categories: from imperceptible earthquakes to devastating catastrophes (Category 12). Since, however, the actual severity of an earthquake can be only imprecisely deduced from its effects and consequences, the American seismologist Charles Francis Richter (1900 - 1985) came up with a new, metrologically unambiguous procedure, only made possible by the development  of the modern-day seismograph. As a measurement for the severity, he chose the deflection of a fictitious seismograph positioned at a distance of 100 km from the earthquake's epicentre. Earthquakes actually occurring are mathematically converted to this standard situation.