Petroleum products in the transportation, because of the metal corrosion and may damage the containers, pipeline and equipment, and even oil spills. Metal corrosion generated oxidation product, will increase mechanical impurities in the oil and accelerated oil oxidation, affect the oil quality. Therefore, we must attach importance to the corrosion of metal equipment oil depot.

(a) the reason of corrosion

Oil in stores, import machine oil seal the working principle of the metal containers and pipeline corrosion caused by the main reasons are:

1. The chemical corrosion

Metal containers and equipment such as calcium chloride, inorganic salt around the media such as calcium sulfate, sodium chloride and metal surface produces chemical reaction, can cause corrosion of metal. The corrosion occurs mainly in contact with the sea or bury in underground storage tank and oil pipelines.

2. Atmospheric corrosion

Chemical corrosion is an electrochemical corrosion. Exposed to the atmosphere metal surface of the equipment, due to the environmental water evaporation, with a layer of condensed water, in a thin layer of the condensed water formed at the same time, there is some gas dissolved in, forming a conductive solution (electrolyte solution), metal and medium happened between REDOX reaction, the metal being destroyed.

(2) anticorrosion coating

(1) regularly in the metal tanks wall spray anti-corrosion coating radial and tangential to bearing the collar position through a tight fit mining realized. Such as epoxy resin layer or raw lacquer layer

(2) regularly exposed to the atmosphere and pumps oil pipeline equipment such as spraying the antirust paint.

(3) set in the surface oil pipelines, to remove water, prevent immersion, lest flake coating.

(4) terminal equipment of the activities in the metal parts, such as oil pipelines valve and so on, to daub antirust fat or grease, prevent moisture from the valve screw infiltration and cause corrosion. Install valve leakage day shield, prevent the rain rushs antirust fat layer.

(5) set at the dock is often splash wet pipeline in and equipment, except in rust corrosion resistant surface spraying coating, but must besmear again brush antirust fat or adhesion better sex protection with grease.

(6) buried in the ground oil pipeline and oil storage container, because of the direct and moisture in the soil, salt, alkali class and acidic substances such as a contact, should apply outer surface paint, asphalt protection layer in spray.
 



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