A time-dependent corrosion wastage model for the partial structure of mobile offshore platforms

ABSTRACT

Offshore mobile platforms are important facilities for the development of deep-water offshore oil and gas resources. In life-cycle safety assessment of offshore mobile platforms, there remains a lack of effective structural corrosion models to guide design evaluation. From a large amount of corrosion data provided by the China Classification Society regarding the operation of offshore mobile platforms, relevant data were statistically analysed, and available corrosion data were selected for analysis and comparison. By analysing the experimental data of offshore mobile platforms, it was verified that the corrosion rate of local components of offshore mobile platforms follows the Weibull distribution, which is consistent with Paik's verification that the corrosion rate of local components of marine mobile platforms follows Weibull distribution. Therefore, the corrosion evolution model of local components of offshore mobile platforms was established by referring to the ship corrosion rate model.

KEYWORDS:

• Corrosion rate
• Offshore mobile platform
• Security assessment
• Statistical analysis

Acknowledgements

Projects 51779041, 51809036 and DUT21JC39 were supported by the National Natural Science Foundation of China, the China Classification Society and the Fundamental Research Funds for the Central Universities.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [Grant Number 51779041,51809036], the China Classification Society and the Fundamental Research Funds for the Central Universities [Grant Number DUT21JC39].