- Capacity. - Tank model designation (vertical, Horizontal, Spherical … etc). - Diameter — if critical. - Material to be stored in tank. - Temperature conditions. - Loading conditions — (i.e., wind or agitator loads, external pressures ... etc.). - Fittings and attachments to be provided, and their description. - Height, width and weight limitations. - Flange gasket and bolt materials. - Whether outside surface is to be pigmented. - Whether U.V. absorber is required in exterior resin. - Whether fire-retardant resins are to be used and the required maximum flame spread. - Whether tank is to be insulated. - Type of heating system. - Any special test procedures to be followed. (i.e., hydrostatic, acetone sensitivity, pressure, vacuum test … etc.).