The BSP construction system is suitable to silos ranging from 2,7 to over 25 metres of diameter and over 40 metres of height.The steel necessary to the construction of silos is rolled in coils. The steel type and strength depend on the static requirements and on the product the silo is designed to store in. The spectrum of the material ranges from non-ferrous metals to galvanised steels and high resistance steel alloys. The double fold joint is what makes the BSP silo advantageous. It runs in a spiral way all around the silo thus bearing all horizontal pressure applied to any part of the structure. The double fold is completely gas-tight and creates an internal smooth surface free from grooves and edges.