STI Tanks Australia Elevated Water Storage Tanks / Water Tower  - STI Steel Bolted Water Storage Tanks are supplied with bolted - free-standing multi-legged lattice towers,  to create pressure at the ground-level outlet – 2.5 minimum at the point of use to a maximum of 6 bars of discharge pressure is sufficient for most applications. STI Tanks  Australia Steel Bolted Lattice Towers are designed and built specifically to the client’s requirements – typical tower platform heights are 6 to 15 meters.  Capacity Range — 50 - 300 cum for bolted construction.