Installation cannot be carried out due to processing and installation errors in petrochemical equipment

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Description: Chemical processing containers and tanks are fabricated outside and then transported to our own workshop for assembly (our workshop does not have the capability to manufacture them). We are facing some issues and would like to seek advice from everyone. A rectangular base made of H-beams is used, with containers placed on this base (the installation positions of the tanks are fixed; the connection flanges are welded outside along with the tanks). After fixing the tanks in their designed positions, it was found that the connection flanges were severely misaligned, making it impossible to make the connections (errors are inevitable in the manufacturing of the base and tanks; slight deformation occurs during the lifting of the base, which cannot be avoided). Solution: The workshop should make holes in the top surface of the tanks where cutting is easy (the diameter of these holes should be 5 cm larger than that of the connection pipes). An additional ring-shaped gasket should be used, as shown in the diagram. The flanges and connection pipes can be welded together, but they should not be welded to the tank body. First, the tank flanges should be connected, and only afterward should they be welded to the tank body. After welding, the center of the connection pipes may not align with the center of the holes in the tank body; there may be a deviation of 2.5 cm on one side, allowing for an eccentric connection with the corresponding flanges. The uneven alignment will not be visible from above, as covered by the ring-shaped gasket. However, having such a gasket welded to the surface of the tank looks unprofessional and significantly affects the overall appearance of the equipment. We hope that experts on this forum can suggest better solutions to this problem