The robust concrete wall of the primary containment tank can take out-of-plane bending loads and is not susceptible to buckling, such as elephant-foot buckling, that steel inner tanks face. Once the wall panels are fully integrated by wire wrapping, the concrete wall can sustain the full wind load without bracing. No resilient blanket is needed to protect the concrete wall from buckling under the pressure of the settling perlite insulation in the annular space.
The bottom of the walls can move radially and, thus, avoid building up constraining forces at the wall/foundation joint. This is in contrast to conventional cast-in-place secondary tank walls that are monolithically connected with the base slab and need to be designed for large constraining loads during a spill. As a result, conventional monolithic wall connections need a thermal corner protection (TCP) to control cracking in this area. A precast concrete wall with sliding support does not need TCP. Resistance to circumferential shear and wall uplift is provided by a combination of shear lugs and restraining cables that allow the wall to slide radially, but constrain it in vertical and circumferential direction.
The shotcrete layer on the tank exterior provides a durable concrete surface. The outer shotcrete layer may be reinforced with fibers or provided with an additional insulation layer to improve the wall's resistance to external fire and missile impact.
Why Choose C3T