Refinery products can be shipped to various destinations using multiple modes of transport. For example, a refinery could be shipping to some depots through pipeline, some through rail and some through ships. Each of these modes of transport have a particular batch size and the arrival rates could vary. Meanwhile, the refinery could be producing MS/HSD at a particular rate (and std. dev). This model simulates the impact of the inflow and outflow on the storage capacities. The assumption is that if the mean flow on inbound is balanced with the total mean flow on outbound, the storage levels would fluctuate within certain bounds. Would they? We can simulate and see. This model requires validation with the field study as well.