The basic erection sequence for a new tank using the jacking system is the following:
Erection starts with the preparation of the foundations and base, by erecting the floor plates and the first two shell tiers. This is followed by the roof (in all self supporting roof tanks) and/or by the top curb angle.
The jack assemblies are distributed, respecting the recommended spacing between them and the maximum load capacity, both that depend on the tank design.
The jacking assemblies are installed inside the tank, plumed and adjusted.
The base plates and the stay leg cleats are welded to the floor and all the jacks are leveled vertically.
The lifting arm is connected to the tank shell by cleats which are welded to the shell.
The tank is lifted to a height a bit larger than the tier plate width and the plates are than positioned.
The plates are vertically welded and the tank is than lowered onto schims placed on top of the newly installed tier.
The plates are then welded vertically (should some welding still be outstanding) and horizontally, while the jacks are being connected to the newly installed tier for the next lift.