Pipeline cathodic protection

What is cathodic protection used for? When is cathodic protection needed? 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.

Both systems operate by imparting a direct current onto the buried pipeline , using devices called rectifiers. Shallow Anode or Distributed Anode Bed Another method is to use a shallow ground bed anode design.

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. Cathodically protected pipelines are equipped with permanent test points where cables are attached to the pipeline to measure the pipe-to-soil potential. This potential should be sufficiently cathodic to ensure adequate corrosion protection. Cathodic protection levels must be controlled so as not to damage coatings.

Pipeline managers must have a cathodic protection plan in place. It’s time to start protecting infrastructure and reducing maintenance costs. All pipelines and tanks made of steel are subjected to the environment’s harsh elements.

These connections have been proven by independent tests not to be detrimental to the pipe, and more than years of usage without any detrimental effects have provided field proof to the tests. Anodes are placed in a column of coke backfill, which allows the current to discharge and travel up and down the entire coke column, allowing the entire coke column to be energized. Cathodic Protection Connections use a special alloy weld metal developed to minimize the effect the weld has on the pipe.

Secure an even distribution of anodes on a symmetrical structure (pipe). Install more anodes close to a region with concentrated surface areas (node point). Always install anodes under sea level. Corrosion is a naturally occurring phenomenon.

Onshore pipelines are used all over the world for transporting oil. Design and installation of cathodic protection systems. Coatings and cathodic protection. The two types of CP systems are galvanic anode and impressed current. Galvanic anode CP systems provide cathodic current by galvanic corrosion or by sacrificing one material to prevent corrosion of the other.

An important aspect of such retrofitting is the determination of when such action should take place. Current output and many other. Assessment of cathodic protection systems on pipelines is normally performed based on potential measurements. The basic idea of a cathodic protection system is that the pipeline is cathodically protected through the use of an electrical current.

This can be done with either galvanic anodes or impressed current.

With the recent surge of pipeline projects, the use of linear anodes in stations has gained significant traction in the market. MATCOR design engineers and field technical personnel are uniquely qualified to perform engineering, pipeline cathodic protection design, field installation support,. The principle of cathodic protection is in connecting an external anode to the metal surface to be protected and the passing of the ensuing electrical dc current so the metal surface becomes cathodic and therefore does not corrode. The cathodic protection must be in operation not later than year after the pipeline is constructe relocate replace or otherwise change as applicable.

Each buried or submerged pipeline converted under § 195.