Cathodic protection for tanks

How do sacrificial anodes work? What is the meaning of cathodic? How to change a water heater anode rod? The common means of supplementing the coating system is to install a cathodic protection system inside the storage tank.

US Tank Protectors , Inc.

Our engineers and technicians have specific knowledge in tank bottom cathodic protection , Design, Installation, Testing and External Corrosion Direct Assessment (ECDA) that is unrivaled in the cathodic protection industry. Cathodic Protection for aboveground storage tanks. A simple method of protection connects the metal to be protected to a more easily corroded sacrificial metal to act as the anode. The sacrificial metal then corrodes instead of the protected metal.

When exposed to the environment, carbon steel and other metals break down electrochemically and ultimately fail. However, as with all design efforts there are a wide number of factors that need to be considered for a sound design that meets generally accepted industry practices. Design and installation of cathodic protection systems.

While localized damaged surfaces can be patche ongoing degradation may weaken the integrity of the overall infrastructure. The oil and gas industry, in particular, uses cathodic protection systems to prevent corrosion in fuel pipelines, steel storage tanks , offshore platforms, and oil well casings. In the marine industry, this protection method is also used on steel piles, piers, jetties and ship hulls. CP principles and CP design concepts as they apply to storage tanks. At that time, cathodic protection was identified as an effec - tive way to prevent leaks.

It is normally used in conjunction with coatings and can be considered as a secondary corrosion control technique. CATHODIC PROTECTIOn FOR TAnKS AnD PIPInG Steel is protected from corrosion when it has a voltage more negative than -0. NOT protected and the CP system must be repaired.

The process of corrosion occurs due to small voltage differences on the steel surface that result in the flow of DC current from one location to another. The method involves a sacrificial anode system, anode and cathode header cable, long line polymeric anode system, etc. Above ground water storage tanks are often equipped with internal cathodic protection systems to supplement the interior coating system that is commonly used for these structures.

Deepwater has pioneered the TankGard impressed current cathodic protection system for internal tank corrosion. A fast AST cathodic protection system design and quote enables MATCOR to quickly manufacture an accurate, reliable impressed current cathodic protection system for your above ground storage tank application. A few basic rules in designing a cathodic protection system include: 1. Bonding together of all structures ( tanks , pipes, both across joints and between different pipes, etc.) is of absolute necessity for proper protection.

This will provide a metallic return current path for any cathodic current. A tank bottom can make good use of cathodic protection and coatings. The provision of an insulating coating to the structure will greatly reduce the current demand for cathodic. As the tank bottom is supported by the ground and is subjected to only hydrostatic pressures, the bottom can be made of thinner metal than is used for pipelines, which operate under pressure.

Some UST systems require a cathodic protection (CP) system. Impressed current cathodic protection systems are the ultimate state-of-the-art, long-term solution to corrosion problems, and are recognized as a superior alternative to sacrificial anode systems , which require frequent replacement.