General situation of the corrosion corrosion monitoring system for offshore oil platform, its protective measures

Oil platform environment for the Marine environment, the water temperature, salinity, velocity, such as sea biological factors affect the corrosion speed. Based on the differences of corrosion environment can be divided into four parts: atmospheric corrosion full immersion zone, splash zone, water area and sea mud area. One of the most serious corrosion is a splash zone. Atmospheric corrosion area refers to expose on the platform part of Marine atmospheric environment, mainly including the part of splash zone above jacket and platform part such as the production and life of floor. The material suffered from corrosion is mainly Marine atmospheric corrosion, the protection measures are mainly composed of coating protection, corrosion is lighter. Splash zone is under the action of tide and wave form of dry and wet alternate area, is the most severe corrosion area. Due to the frequent tidal range or strong wind when splatter shock waves, the component surface continues for aerated water wet friction. Atmospheric and water effect cause serious corrosion at the same time, into the bubbles also enables the steel structure of the water to remove protective film, under the effect of flow accelerated corrosion. Full immersion zone is mainly dissolved oxygen corrosion, the influence of the formation of electrochemical corrosion, due to the material of steel structure itself microstructure defects or macrostructure defect structure parts in high potential anode from corrosion, and the lower parts potential cathode area are protected. Full immersion zone of sea creatures adhesion of sea creatures exist in corrosion. Sea mud area mainly refers to the steel structure embedded parts of the sea mud because of dissolved oxygen and sea mud microbial corrosion, the corrosion degree of slight.

Corrosion monitoring system for corrosion monitoring can be divided into two categories, respectively is offline and online monitoring. Off-line monitoring is in the structure or equipment operation interval every time to detect the corrosion condition, it is mainly to control risk and prevent accidents, obtained is the result of corrosion. Main methods such as ultrasonic method, magnetic flux leakage method; On-line monitoring under the condition of not influence the operation of equipment, continuous or regular monitoring of the condition of the equipment, usually is automatic. Offshore oil platform of on-line monitoring is to detect the corrosion environment effect how much is the corrosion rate of steel structure, steel structure is obtained about the information of the corrosion process, and the operating parameters, including processing technology, corrosion protection measures, with mutual relation between running status data, and according to the data to adjust the production operation parameters, its main purpose is to control the occurrence and development of the corrosion, the benign operation of the facilities. Main methods are: hanging slice method, resistance probe method, electrochemical method, magnetic induction method, etc. The former called offline detection of corrosion, the latter is called corrosion online monitoring