... subsea hydrogen permeation test cathodic protection INTRODUCTION In previous work, Viereckl et al. ¹⁹ estimated the HSC resistance of the nuclear-grade ASTM A508 Gr.4N alloy using SSRT as a function of applied cathodic potential. The HSC resistance of the A508 Gr.4N alloy was compared...

...Abstract The Laggan-Tormore gas field is a deepwater development located 125 km off the West Coast of the UK Shetland Islands, in the North Atlantic. The field consists of five subsea production wells tied back to subsea manifolds that are connected to two 18-in multiphase pipelines. In addition...

...Abstract Aluminum alloys have high strength to weight ratio, and during the years they have been used successfully in the maritime industry, due to their good corrosion resistance when correctly applied (e.g., properly selected). In the subsea environment, the oil and gas industry currently uses...

... protection, is limited to prevent different forms of hydrogen embrittlement (HE) such as hydrogen stress cracking (HSC) and sulfide stress cracking (SSC). As a result, the specified minimum yield strength (SMYS) of forged LASs for, e.g., subsea components, rarely exceeds 550 MPa (80 ksi), while the most...

... alloy UNS N08830 alloy was recently evaluated for resistance to Hydrogen Induced Stress Cracking (HISC), simulating conditions arising during cathodic protection in a subsea environment. The unique set of test methods and conditions included SSRT and ISL, all using pre-charged specimens with ongoing...

...Abstract A recent subsea failure of two coupling assembly flanges made of UNS S32760, a 25 wt% Cr super duplex stainless steel, lead to an extensive root cause failure analysis. The components showed a single longitudinal crack along the swaged ferrule, which arrested towards its thicker section...

...In most cases, the accessibility and inspection activities of the subsea pipelines are expensive. Costs for corrosion maintenance represent a significant portion of operating expenses in the offshore industry, especially for aged pipelines. Different risk approaches might be designed and used...

... within corrosion management, a new field gradient (FG) measurement tool has been developed to revolutionize CP inspection of subsea facilities. The oil and gas operators are moving from periodic subsea inspections to risk based inspection intervals. FG data combined with in-house CP modelling software...

...Abstract Subsea pipelines network represents a key component of oil and gas offshore operations, thus determining the integrity status for each pipeline to ensure a safe, reliable and cost-effective operation is crucial. It is always difficult to regularly check pipelines of tremendous length...

...Abstract Monitoring pipelines for microbial corrosion can be challenging because obtaining samples is difficult. This is particularly true of subsea pipelines where the only available samples are oil samples and pig returns. Oil samples do not provide reliable data regarding microbial...

...Abstract Venezuelan new developments in offshore area involve the design and installation of subsea pipelines, platform and subsea equipment. One of these projects includes subsea Dragon-CIGMA Gas/Liquid Export Pipeline with approximately 110 km long and 914 mm diameter. This line...

... and asset reliability. MIC corrosion management crude oil multiphase gathering water injection subsea onshore pipelines mitigation KPIs INTRODUCTION Improved management of internal MIC threats in the operation of onshore and subsea pipelines is the focus of this paper, however; the ability...

...Abstract Developing and applying production chemicals in subsea oilfields located in environmentally sensitive areas presents a number of challenges. First, production chemicals used in these oilfields are required to have a good ecotoxicological profile. Ideally, they must be biodegradable...

... threshold values for design purposes. FAILURE CASES AND INVESTIGATION RESULTS For managing the risk for HISC in duplex stainless steel subsea equipment, design practices that aim at limiting local stresses and strains have in later years become commonly used. Based on data from earlier failures as well...

... of this system have been installed on subsea pipelines, topside offshore, and on land. This monitoring concept can be used with communication of data in real time, or with a data logger. This kind of monitoring system can be used to provide pipeline owners and operators with data to verify the effectiveness...

... (6.4 MM Liters) of seawater to enter the 18 inch (45.7 cm) lateral. That paper described the efforts initiated to repair and dewater the trunkline and then to repair the subsea connection and dewater the lateral. Figure 1 illustrates the gathering system and the location of the breach, where...

... pressure, P, production fluid temperature, T_int, and subsea water temperature, T_ext, were used as variables for the numerical model for each case of metal-loss parameters. The P parameters were from 2 to 10 MPa T_int values varied from 4 to 60°C, and T_ext...

...Abstract Concept selection and initial design of deepwater subsea production systems can have a profound impact on the evaluation of the commercial viability of a discovery. Although detailed design comes later in the process, the decisions made at this early stage of a project will generally...

...? visco-elastic coating rehabilitation subsea polyisobutene fieldjointcoating INTRODUCTION Modern pipeline maintenance and new construction require advanced corrosion protection systems in order to prolong service cycles and to ensure reliable and sustainable operation features. It is obvious...

... THPS Glutaraldehyde Biocide Scavenger Pipeline Integrity Threats Internal Corrosion Inhibitors Pigging Subsea Gulf of Mexico Hurricane Ike Seawater POST-IKE ASSESSMENT AND PIPELINE REPAIRS Figure 1 depicts the offshore gas pipeline system within the Gulf of Mexico. While Hurricane Ike...