Large vertical storage tanks generally refers to the storage tanks whose diameter is more than 5 meters, especially those whose maximum diameter can up to 40m-50m and the maximum height can up to more than ten meters. For the fabrication and installation of these kind of large storage tanks, as it is unachievable to transport a assembled tank, field erection is the most commonly method. There are several erection methods for field erected tanks, such as traditional method, jacking method, and integral lifting after the site prefabrication.
The traditional method is erecting on ground base of storage tank, after one section is assembled, the scaffold tower will be added a layer as the tank increased, because of the high operation, this method is more dangerous.Jacking method is a storage tank erection method based on the tank bottom as datum plane, the top wall plate and tank roof is installed firstly, then assemble, weld and jack the wall plate step by step alternately until the bottom wall installation is completed in sequence. The jacking method is a common method for construction and installation of large storage tank at present, which owned many kinds of technology and corollary equipment, and one of the most advanced, reliable and vigorous method is hydraulic jacking technology, which is suitable for lifting large storage tank(dome-roof tank, floating roof tank, internal floating roof tank, steel mast, communications tower and steel spire, etc.) construction.