The first ferrule is positioned on the concrete raft.
The ferrule is angle-iron, pre-shaped in the factory to the exact dimensions of the tank.
The metal structure to support the skin is then installed.
Once this manual operation is completed, the installers position the hydraulic cylinders, pegged into the concrete, to permit the ferrules to be installed at ground level.
- When first lifted, the geomembrane is positioned on the ground then attached to the internal periphery of the top bracket of the tank.
- The plates are then lifted, positioned and adjusted one by one so they can be bolted at the correct skin height.
- The various connections, taps and fittings are installed one by one, at ground level.
- Once the last ferrule is positioned, it is attached, a trim is added to complete the final connection and permit the installation of anchor sockets (2 per sheet) to secure the tank to the ground.
Anchor pins (“Spit-fix” expansion pins Ø M12 & M16 to M20 depending on the size of the project and/or project Specifications) are positioned at the periphery every 1.20m, in the anchor sockets.
- For the final phase (connection of internal pipework), a DN600 manhole is provided at the bottom of the tank.
- The position of the geomembrane is checked before the tank is filled.