Offshore staff
OSLO, Norway – DNV GL has published a new methodology that addresses corrosion under insulation (CUI) on oil and gas installations.
CUI arises when water becomes trapped between insulation and the piping and vessels it is intended to protect.
The methodology is designed to help integrity engineers and plant managers identify areas of a facility at the greatest current and future risk of CUI, then take action to prevent structural failures.
Recommended Practice (RP) DNVGL-RP-G109 was developed with regulatory bodies, international oil and gas operators, and supply chain groups.
CUI can take the form of localized external corrosion in carbon and low-alloy steels, external stress corrosion cracking (ESCC) or pitting in austenitic and duplex stainless steel. However, the oil and gas industry has not adopted a standard approach for identifying and managing the threat.
For identification of CUI operators currently employ diverse inspection methods that can lead to undetected defects, followed by the expensive process of systematically removing and renewing all insulation and coating with limited upfront assessment of the risk of CUI presence.
DNV GL’s RP is said to provide a systematic approach to assessing, mitigating, and updating CUI risk.
Koheila Molazemi, Technology and Innovation Director at DNV GL - Oil & Gas said: “Our Recommended Practice has been developed as a guide to the most effective and efficient way to assess, mitigate, and systematically manage the risk…
“The combination of the new Recommended Practice and the CUI Manager, digital tool enables the industry to control CUI risk significantly more cost efficiently.”
In addition, DNV GL has developed a digital tool, CUI Manager, which applies machine learning to CUI data gathered from operators with the methodology from DNV GL’s Recommended Practice, in order to continuously assess and calculate the risk of CUI in process plants.
03/18/2020
