The NORDWELD TANK BUILDING SYSTEM is a ground-breaking new onsite system designed for the erection of large aboveground atmospheric and pressured tanks - offering a construction diameter of between 8 to 50 meters, and a capacity of up to 700 metric tons. The maximum height of a tank depends on the diameter and other factors that have to be taken into consideration. The system is completely modular and comes delivered in 20ft high cube shipping containers to the building site. Each tank is then built directly onsite using the top-down method of construction, with the outer shell plates of the tank, being continually rotated during the mechanized welding process, i.e. all assembly steps and welding tasks are performed at the customer's onsite location.