You must report to the Regulatory Authority what you have learned from a full investigation of the site within 45 days of confirming your leak or spill. At the same time, you also should submit a report explaining how you plan to remove the leaking petroleum if you have found contaminated water to ground water. Additional site studies may be required. Steel tanks and piping can be coated with a corrosion-resistant coating and cathodically protected. Cathodic protection uses either sacrificial anodes or impress current to prevent electrolysis.
Any metal piping connected to non-corrodible tanks still requires corrosion protection.
Steel tanks can be protected using a method in which a thick layer of non-corrodible material is bonded to the tank. Suction piping should drain back into the storage tank and release suction. A check valve should be installed in each suction line below the suction pump. Standard tests include gravitational and pressurization testing. Probably the least expensive replacement solution.