PIPE LINES-EXTERNAL CORROSION

Dan Babor
unpublished
Two areas of corrosion occur in pipe lines: corrosion from the medium carried inside the pipes; corrosion attack upon the outside of the pipes (underground corrosion. Electrolytic processes are also involved in underground corrosion. Here the moisture content of the soil acts as an electrolyte, and the ions required to conduct the current are supplied by water-soluble salts (chlorides, sulfates, etc.) present in the soil. The nature and amount of these soluble materials can vary within a wide
more » ... ary within a wide range, which is seen from the varying electrical conductivity and pH (varies between 3 and 10). Therefore the characteristics of a soil will be an important factor in underground corrosion.
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