Specifications include, but are not limited to: 1) Storage tank must be constructed according ASME guidelines for stationary ground storage. DOT tanks are not allowed. 2) Pressure vessel materials of construction will be compatible with the gas composition specified above. 3) Minimum rated design pressure: 2800 psig. 4) Maximum overall length: 28 feet 5) Maximum overall width of support structure cannot exceed: 5 feet 6) Minimum vertical height between pressure vessels: 0.5 feet 7) Nominal water volume of each pressure vessel: 50-60 cubic feet (50 is minimum). Larger tank volumes are preferable as long as they remain within the overall length and width requirements (28 feet). 8) Pressure vessel assemblies will be painted for outdoor service, supplied complete with I-beam supports, valves, gauges, and pressure relief devices to meet the necessary codes. 9) Vessels will be clearly marked as ASME Pressure Vessel with allowable operating pressure.