Section 10 Corrosion Protection

Section 10 Corrosion Protection Requirements Types of Protection Cathodic Protection Piping STIP3 Tank Recordkeeping

Section 10 Requirements Corrosion Protection All metal components of UST System must have Corrosion Protection for components in contact with ground Federal and state regulations require that all unprotected underground metal components of a UST system must have corrosion protection.

Section 10 Types Corrosion Protection Completely non-corrosive material Steel-clad Tanks Corrosion-resistant coating with Cathodic Protection Interior tank lining Cathodic Protection Combinations The types of acceptable release detection for pipes are: Completely non-corrosive material Steel-clad tanks Corrosion resistant coating with cathodic protection Interior tank lining Cathodic protection combinations

Section 10 Cathodic Corrosion Protection Prevents corrosion by making the ferrous substrate the Cathode of an electrochemical cell Designed by Corrosion Expert Galvanic Anodes Impressed Current Cathodic protection prevents corrosion by making the ferrous substrate the cathode of an electrochemical cell. Cathodic protection must be designed by a corrosion expert. Galvanic anodes , also known as sacrificial anodes, Can be attached to the UST for corrosion protection. Sacrificial anodes are pieces of metal more electrically active than the steel UST. Because these anodes are more active, the corrosive current will exit from them rather than the UST. Therefore the UST is protected while the attached anode is sacrificed. Impressed current systems use a rectifier to covert alternating current to direct current. This current is sent through an insulated wire to the anodes, which are special metal bars buried in the soil near the UST. The current then flows through the soil to the UST system, and returns to the rectifier through an insulated wire attached to the UST. The Ust system is protected because the current going to the UST system overcomes the corrosion-causing current.

Section 10 Piping Corrosion Protection Completely non-corrosive material Corrosion-resistant coating with Cathodic Protection Cathodic Protection Coating with di-electric material Some of the methods of corrosion protection for piping are Completely non-corrosive material Corrosion-resistant coating with cathodic protection Cathodic protection Coating with di-electric material

Section 10 STIP-3 Tanks Corrosion Protection Three types of protection Heavy-duty anti-corrosive coating Cathodic Protection Di-electric or nylon bushings An STIP-3 tanks has three types of protection: a heavy duty anti-corrosive coating carthodic protection di-electric or nylon bushings.

Section 10 Recordkeeping Corrosion Protection Test within 6 months of installation Test minimum of once every 3 years Reports from the last 2 tests must be retained All new corrosion protection systems must be tested within 6 months of installation. They must be tested a minimum of once every 3 years, and reports from the last two tests must be retained.