... fast, level display, with positive and negative regulator, Green filter. Features of spiral steel silo 1,Good sealing performance With five-layer ... crimping, the seam are very tight, and the silo is of a good sealing performance. 2,Small area occupancy1) Height and ... 25-30 years. 4,Short construction period 1) Highly construction of spiral silos on site, short construction period.2) Just 8days ...