In the chemical industry, a large number of different reactors are used. Especially in the crude oil processing industry. Many everyday objects are made of plastics. These are manufactured using small PET pellets. For storage and further processing, silos for the pellets are needed in this area. On the one hand, these are under high pressure and on the other hand, high operating temperatures are required for processing.

The reactors for PET processing are usually tall and slim constructions with a funnel in the lower part, which are mounted on a substructure and fixed to the foundation by means of anchor rods. Stress and stability proofs must be provided when dimensioning the reactor shell. Thereby the large pressure conditions are to be considered. The characteristic resistance values of the materials must be reduced according to the temperature. A special detail is the connection of the silo to the substructure. This can be solved by means of different constructions (clamps, stiffeners, support leg connection). Subsequently, locally high vertical acting forces and bending moments are introduced in a limited area. When connecting to constructions with smaller wall thicknesses or stiffnesses, it may be necessary to provide reinforcement plates to increase the effective width of the load introduction and to counteract local buckling or failure.