Selection of Corrosion Monitoring Equipment for Subsea Safety Joint

Abstract

In Nature, most of all Metals evolve as stable ores of chemical compounds like oxides, sulphides or carbonates. Lot of energy is required to refine and make them useful for some means for every Industry. Corrosion on metals can reverse an unnatural process back to a lower state of energy, easily as simple. It eats away metal in outdoor furniture and automotive bodies, leaving the surface with bad appearance and if it is not treated at right time, eventually it will lead to failure. Corrosion causes rusting the cookware and tarnishing of silver parts. Of greater importance, corrosion takes place on Steel bars in reinforced concrete result in failure of highway section, damage to big buildings, even collapse of towers that may take lives of many and leads to significant loss of resources. Hence, Corrosion prevention would be an important step for any industry, especially oil and gas Industry where corrosion is a serious ageing mechanism which impacts the equipment of Subsea, Surface, refineries and process plants. The present study is on localised corrosion happen in Safety Joint, inner sleeve and most design feasible corrosion monitoring equipment based on cost measures has been identified. Different types of Corrosion monitoring equipment’s for offline and online monitoring are discussed and GE RADAR Inspection with use of Ultrasound inspection technology has been identified as most feasible equipment. Equipment tool head can pass through safety joint bore during scheduled inspection intervals and which could take photographs of slots of inner sleeve where there is continuous flow of sand particles, due to accumulated sand on pressure chamber of safety joint which would create a threat of corrosion or erosion corrosion. Second feasible solution for corrosion monitoring would be real time installed corrosion monitoring device called Clamp on Corrosion Monitoring equipment, considering the investment Cost (Development and Installation Cost) of clamp on corrosion monitoring equipment, changing the material of to corrosion resistant alloy with required strength (Alloy 718) would be more effective solution for Safety Joint Inner Sleeve.