Cone Bottom tanks offer complete drainage. Belding Tankâ€™s standard cone apex angle is 90Â°. All Cone Bottoms are designed in accordance with ASTM D-3299 or D-4097 standards for elevated cone heads. Cone Bottom tanks come standard with a primed carbon steel pipe leg stand with floor plates and a standard 18â€ under clearance from the tank bottom to the floor plates. Therefore, when complete drainage is an absolute must, the Cone Bottom design is the only choice. Leg stands can be provided as painted carbon steel, Fiberglass Reinforced Plastic (FRP), T-304 or T-316 stainless steel pipe legs or FRP skirt support, at additional cost.