In view of the pitting corrosion on the surface of the outdoor stainless steel tray before the delivery of the vessel in the past offshore projects, through the investigation of the site, in practice, due to the site bump, construction environment, protection measures and other factors, stainless steel tray is large area point corrosion before the delivery of the vessel, in the later stage, a third-party company is required to carry out a secondary passivation treatment on the stainless steel tray to prevent corrosion to meet the requirements of delivery, and at the same time increase the additional cost. The floating production device as an example, the study on the basis of the traditional pickling passivation, process upgrade, and adopt the anti-corrosion treatment of spraying polyurethane-varnish, through the protection of stainless steel body to eliminate the corrosion phenomenon due to the influence of external factors, at the same time to strengthen the protection of the site and transportation process, in the actual verification of the site has achieved good corrosion effect. The optimized design scheme provides reference for the anticorrosion design of stainless steel trays surfaces such as drilling platform, FSO, oil tanker and other projects.
About 3.4% of the world's gross domestic product (GDP) is consumed by corrosion every year (that is, the cost paid for corrosion, also known as corrosion cost, commonly known as corrosion loss), developing countries are higher than developed countries, up to 5% of China's corrosion has caused huge economic losses, the world's recognized data shows that the cost of corrosion is greater than the sum of the losses of all natural disasters (earthquakes, tsunamis, droughts, floods, etc.), once the corrosion problem occurs, it will lead to damage to engineering equipment, key structures and infrastructure, this can lead to catastrophic accidents with unimaginable consequences(Han, 2016).
As a general-purpose offshore floating production unit, many stainless steel trays are equipped on the outdoor main deck for the support and fixing of cables and tubing pipes, which are very important parts of crude oil input, processing and production and storage processes, among which cables and tubing pipeline systems are used as connecting arteries, and their supports are mainly composed of stainless steel trays is an important part, how to apply to various sea areas around the world, to meet different hydrological conditions and operating environments, solve the pitting corrosion on the surface of the outdoor stainless steel trays, prolong the service life of the material, and make it work reliably and safely on the floating production storage vessel to ensure the safety of personnel and minimize the economic losses caused by accidents, so as to effectively protect the safety of personnel and floating production equipment.
