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Addtime：2016-05-19 18:05:49 Print
For onshore buried pipelines, anti-corrosion protection is typically provided by applying a protective coating on the pipeines. Our cathodic protection designs include isolation joints and a monitoring system. ?
Prior to the design of a cathodic protection system for an onshore pipeline network, a site survey is recommended to collect essential information on soil resistivity, geographical characteristics, the likelihood or the existence of stray currents, and any other important features along the pipeline route.
For retrofitting cathodic protection systems on an existing pipeline, certain repairs and modifications to the pipeline may be required to achieve an effective cathodic protection. A current-drainage test is often the best and fastest method to assess the required protection current.
In order to protect the pipeline, isolation joints should be installed to prevent interaction, and loss of cathodic protection current from other pipelines.
Sacrificial anodes are preferred for technical and economic reasons. Soil resistivity is the parameter that determines the selection of the sacrificial anode alloy. Magnesium anodes can be used in soils with resistivity up to 3,000 Ohm-cm, Zinc anodes can be used in soils with resistivity up to 1,500 Ohm-cm (5.3.2). Aluminum anodes are not normally used in land applications.
In the previous：Special anodePrior to the design of a cathodic protection system for an onshore pipeline network, a site survey is recommended to collect essential information on soil resistivity, geographical characteristics, the likelihood or the existence of stray currents, and any other important features along the pipeline route.
For retrofitting cathodic protection systems on an existing pipeline, certain repairs and modifications to the pipeline may be required to achieve an effective cathodic protection. A current-drainage test is often the best and fastest method to assess the required protection current.
In order to protect the pipeline, isolation joints should be installed to prevent interaction, and loss of cathodic protection current from other pipelines.
Sacrificial anodes are preferred for technical and economic reasons. Soil resistivity is the parameter that determines the selection of the sacrificial anode alloy. Magnesium anodes can be used in soils with resistivity up to 3,000 Ohm-cm, Zinc anodes can be used in soils with resistivity up to 1,500 Ohm-cm (5.3.2). Aluminum anodes are not normally used in land applications.
