Founded in 1930, Preload is one of the leading manufacturers of prestressed concrete tanks. The company has built more than 3,000 tanks of various types, sizes and designs. The company analyzes the topography, geology and other local conditions for designing and constructing a tank. It varies height-to-diameter ratios and tank elevation as per the facility design, hydraulic gradient and space requirements. Preload also offer tanks that can be fully buried. Additionally, it offers special tanks that can resist hydrostatic uplift in flood-prone areas. The company manufactures special tanks in seismic zones and on sites with differential backfill elevations. Preload is located in Hauppauge, N.Y.