Abstract
This article is mainly based on the characteristics of the marine environment of islands and coastal seas and the current corrosion problems of storage tanks as well as their main locations, analyse the reasons for their formation and consider the potential safety hazards, so as to propose several effective storage tank corrosion protection methods, which has important positive significance for the long-term development of islands and coastal seas oil storage tanks.
Highlights
In the course of the hydrological cycle, a large amount of water enters the atmosphere from the sea, carrying with it a large number of halogen ions and solid salt particles, which form a salt spray that, when transported by the wind, accumulates in depressions in the tank roof, in weld seams and even in the tank floor through the tank drainage holes, forming an aqueous solution containing a large number of halogen ions
The coastal and island areas have strong winds, often typhoons and other attacks, salt particles and some other solid particles with the wind constantly hit the tank wall, which will to some extent lead to the tank wall paint and other protective layer off, making the steel local area directly exposed to the atmosphere in contact with oxygen and accelerated corrosion; the coastal soil near the loose, low resistivity of the soil, salt content is very high, so in the tank, the temperature of the soil is very low
In the case of the Gangpu oil depot in Sinopec Zhoushan Oil Company, for example, the main areas of corrosion found during overhauls in 2000, 2009 and 2012 were the peeling of the paint on the tank walls, the welded seams of the connecting parts, the areas where water had accumulated due to depressions from external forces and the bottom plates of the storage tanks
Summary
There is a good development momentum for petrochemical industry in China, Considering the convenience to receive imported oil and transport oil products, more and more oil reserve bases are built in the coastal areas or on some islands in China, such as Zhenhai Refining and Chemical Base in Ningbo, Zhejiang, and Aoshan National Oil Reserve Base in Zhoushan, Zhejiang, since the weather condition on the coastal and island is with rich rainfall and high water content with salt particle and halogen ions (especially the chloride ion) in the air, the salt particle will be easyto stick on oil tank, and make the oil tank wall corroded, will cause the tiny crack onthe oil tank wall, if there is tiny crack on the oil tank wall, it is likely to cause serious safety accidents, improving anti-corrosion ability to maintain the oil tank under good condition is very urgent and necessary
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