Acoustic echo cancellation keeps turning itself on

Example(s): If the CP is monitored via an in-line inspection tool (smart pig), then the protection status can be confirmed or problems identified regardless of the pipeline location, accessibility, or condition of the right of way (ROW). Now, an external DC electrical power source is used to provide the protection current. The sacrificial metal then corrodes instead of the protected metal.impressed cathodic protection system is used for structures such as long pipelines, where passive galvanic cathodic protection is not adequate. galvanic cathodic protection system connects the metal to be protected to a more easily corroded 'sacrificial metal' to act as the anode. There are two types of cathodic protection, galvanic protection and impressed current. If current measurements are recorded at regular intervals, the generalized coating performance may be assessed by examining the rate at which electrical current is collected along the pipeline. The collection of electrical current along a linear structure (such as a pipeline) produces an axial current profile that is dependent on the current density received by the structure - which is dependent on the performance of the external coating system. Cathodically protected structures receive electrical current through the environment surrounding the structure.

For transmission pipelines carrying hazardous liquids and natural gas, the use of coatings and cathodic protection is required by Federal regulations (Title 49 CFR Part 195 and 192).

It is commonly used as part of a corrosion prevention system, in concert with coatings on underground and submerged structures. Cathodic protection Cathodic Protection (CP) is a widely used and effective method of external corrosion control.

Acoustic echo cancellation keeps turning itself on