How long can the tank be left in lifted position, i.e., when the load is on the jacks?
Normally, after the lifting is done, immediately the next shell plate is put in placed and welded to the previous shell plate, thereby releasing the load from the jacks. It is not advisable to keep the jacks loaded for more than the time required to place the next shell course in position and welding. In case heavy winds are expected during this period, the tank should be tied with guy ropes.
