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Coating application on the exterior of ocean-going vessels and offshore platforms is normally very time sensitive, and frequently must be performed during times of high humidity, sweating hulls and daily rain showers. This paper will describe the use of solvent free, surface tolerant epoxies that can be applied to wet surfaces during times of very high relative humidity. Both the positive and negative aspects will be covered.
Protective coatings are ubiquitous on offshore oil structures. As with most situations, the use of coatings is driven by myriad factors unique to the industry. The paper will provide an overview of the types of structures, the coatings used in different zones of the structures, and the pragmatic and regulatory criteria which influence the coating process.
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In November 2004 ISO 19840 was published to provide a consistent method for the measurement of coatings applied to structural steel for corrosion prevention. This new standard includes methods for the adjustment of gauges to take account of surface roughness, the designation of inspection areas and the use of acceptance criteria.
Due to very severe conditions at offshore, conventional coatings do not work as they require multicoats to acquire high thickness and their curing times are rather high, giving chances for the contamination by severe environment (high RH and salt) in the intermediate layers. Thus, modern coatings which can give larger thickness in just one single coat and cure in a few minutes time are required for critical applications such as splash zone which is marred by continuous dry and wet spell.