Description of Porcelain Enamel Irrigation Water Tank Porcelain enamel irrigation water tank is made up of glass fused steel with special sealant & self-locking bolts, which are designed for optimum energy efficiency, durability, and long-lasting performance. The bolted steel construction of these irrigation water tank is exceptional for the storage of potable water, wastewater, petroleum, chemicals, and dry bulk and in such applications as reservoirs ( open top or with aluminum dome or flat panel roof ), power generation stations, standpipes, frac processing, fish ponds, sludge tanks, trickling filters, high temp fermentation plants.