Method and system for replacing the fixed roof of a storage tank

A method for replacing the fixed roof of a storage tank, the method comprising:

• pre-assembling a roof on a floor of a tank basin in the form of modules, the pre-assembling comprising the steps of:
• a) constructing a template manufactured from welded structural profiles, thereby to reproduce an arrangement of sheets on the fixed roof and with a shape corresponding to a section of a circumferential area of the fixed roof,
• b) positioning a coil support comprising a coil of metallic material on one side of the constructed template,
• c) uncoiling the metallic material from the coil support onto the template built to form sheets,
• d) welding the sheets in an overlapping manner, as the sheets are arranged on the template to form respective modules, and
• e) welding mooring eyelets to the formed modules;
• and
• assembling the modules on a top of the tank, the assembling comprising:
• i) connecting a walking beam to respective mooring eyelets by a plurality of support cables,
• j) adjusting tension of the respective cables of the plurality of support cables connected to the walking beam, thereby to guarantee the alignment of a module,
• k) hauling the module to the top of the tank,
• l) repeating steps (b) to (e) of the step of pre-assembling for a new module,
• m) welding the modules together to form the roof of the tank.