Subsea Engineering

The global energy sector runs on people -and Singapore sits at the centre of the world's most critical oil and gas projects. From deepwater FPSO developments off West Africa to LNG terminals across Southeast Asia, finding the right certified professionals, on time and at scale, is the difference between a project that delivers and one that stalls. If you are an EPC contractor, operator, or project owner searching for dependable oil and gas manpower supply in Singapore, this guide covers everything you need to know -the roles in demand, what separates a reliable manpower partner from a risky one, and how Singapore-based agencies serve global energy projects.

On-bottom Subsea Pipelines face un-stabilization and Freespan abnormalities due to uneven seabed, imbalanced Buoyancy, scour, varying soil conditions and storm event, which causes overstressing and fatigue damage failure. Currently there are limited available practical methods which can be used for deciding appropriate rectification solutions and designing accurate and effective support sizes. So, practical methods are developed and derived from proven and verified empirical methods together with limited guidelines available under API-RP-2A and DNVGL-ST-F101. 

The process involves developing and deciding practical methods for rectification solutions, optimized supports and stabilization starts with data collection for design parameters extracted from Pipeline layout and inspection reports for Pipe sizes and protective coating thicknesses, elevation from seabed and freespan. Payloads and Soil data extracted from Stress report and geotechnical report respectively. Hydrodynamic loads from Metocean report for deciding appropriate Wave theories. Design parameters are then analyzed to produce highly sophisticated and complex design gained by experience and from industrial codes, which are then used for deciding practical methods, evaluate construction strategy, program and appropriate rectification solutions.

Currently being used traditional methods for pipeline rectification and supports suggest complete or local replacement of Pipelines with revived thickness, material, weight increase, pipeline elevations changes and operational shutdown for rectifications and to install new concrete sleepers under the Pipelines. Practical methods use Cement Grout material over the concrete in most of the cases which can be poured and cast at site under the customized fabric bags while satisfying Strength and feasibility requirements. Practical methods save cost and time for replacing the subsea pipelines and maintain operational performance and efficiency since early installation stage to its design life. Practical methods based on evaluation are being chosen from the wide range solutions by way of providing Pyramid shaped with varying designed base and pedestal size to suit Soil conditions and hydrodynamic loads for pipeline support, jack-up support for lifting and support the pipeline, Dome / T-shaped / wedge Crossings at the pipeline / Cable intersections with varying cross angles, End mattress for sloped pipes, concrete or grout weight mattress and Sleeves weight on pipeline for stabilization, scour skirt for Pipeline scour protection, J-Tube supports for Risers and Prefilled sand bags for Pipeline supports and stabilization.

The operational landscape of modern underwater robotics, exemplified by the "Autonomous Underwater Competition-Europe," has evolved into a multi-disciplinary challenge requiring high-fidelity systems engineering. This study provides an in-depth technical analysis of a dual-platform Unmanned Underwater Vehicle (UUV) architecture, engineered to navigate the complex "Line Following and Closed Area Inspection" mission profiles. By integrating a high-performance "Main Ship" (UUV) with a compact "Daughter-Ship" (Mini ROV), the framework addresses the critical trade-off between computational power and maneuverability in confined spaces. The research investigates the nexus of computational fluid dynamics (CFD) for axi-symmetric hull optimization—targeting an ideal length-to-diameter (L/D) ratio of 7.0—and advanced sensor fusion techniques like Factor Graph Optimization (FGO) for precise navigation in GPS-denied, 20-meter deep environments. This preface introduces a robust methodology for developing cost-effective yet research-grade subsea systems, bridging the gap between theoretical hydrodynamics and practical autonomous intervention.

Despite the halt in attacks in the Red Sea, the insecurity caused by the Houthis is affecting the infrastructure dynamics related to submarine communications cables. Delays in cable laying and repair operations, caused by safety concerns and regulatory obstacles, have significant economic, political and security implications. There is a need to increase repair and laying capacities, protect cable ships and ease access to Yemeni territorial waters.

Il presente documento ha come obiettivo primario la sensibilizzazione dell’interconnessione che
coesiste fra spazio, società ed l’ambiente e si concentra sull’analisi dei fenomeni diretti ed indiretti
riguardanti il settore spaziale della space economy con uno speciale focus sulla security a livello
nazionale. L’accento viene posto sull’interdipendenza dei fattori, mostrando un unico quadro di
riferimento in principio considerato come analisi settoriali separate.
Vengono presi in considerazione molteplici fattori, fra i quali si possono annoverare: la concezione
di sicurezza e il suo evolversi nel tempo, l’importanza della sicurezza nel dominio spaziale e le sue
specificità, la space economy Italiana con annessi sviluppi internazionali, l’ecosistema spaziale
italiano in un ottica di indirizzi di governo in materia spaziale e aerospaziale, il contesto spaziale e
subacqueo e il loro approfondimento congiunto, le prospettive future da tenere in considerazione
data l’interconnessione e l’interdipendenza riscontrata nei fattori esaminati.
Nel corso della trattazione viene dimostrato come, senza un’adeguata conoscenza e
consapevolezza dei fenomeni, effetti drammatici dati da una “inhumana securitas” rispetto ai
fattori presi in esame colpiranno direttamente ed indirettamente territori e vite umane.
Si tratta di disegnare un percorso incentrato sulla persona, dove la tecnologia deve
generare progresso, in primo luogo umano e sociale: non cieco positivismo o concentrazione di
obiettivi mirati a creare ricadute economiche che generano diseguaglianze.

The offshore pipeline industry is planning new gas trunklines at water depth ever reached before (up to 3500 m). In such conditions, external hydrostatic pressure becomes the dominating loading condition for the pipeline design. Pipe geometric imperfections as the cross section ovality, combined load effects as axial and bending loads superimposed to the external pressure, material properties as compressive yield strength in the circumferential direction and across the wall thickness etc., significantly interfere in the definition of the demanding, in such projects, minimum wall thickness requirements. The scope of this paper is to introduce fabrication and material issues, as well as geometric tolerance, in relation to ultra deep water pipeline design.

The present work is aimed at studying the effect of different system parameters on the heat transfer and buoyancy induced flow inside circular tubes using CFD. They include tube length, tube diameter, tube inclination and heat supplied. Constant heat flux boundary condition is created on the tube surface. The heat transfer coefficient and the induced flow rate both were found increasing with increase in the heat supplied and the angle of inclination with the horizontal. The flow rate of water is found to be independent of the tube length if the tube length is more than 1m.The Experimental results is to be Compare with the CFD results. Boundary condition, Geometry is created in GAMBIT and Solver; Boundary conditions are provided to the pipe in fluent software. Convection is a process which involves mass movement of fluids. Natural convection occurs due to temperature difference which produces the density difference which results in mass movement. Heat transfer by natural convection i...

Pipelines and Cables share the same challenges in crossing the Arabian Sea to India. This presentation compares and contrasts the implications of these challenges on pipelines and cables as mediums for energy transmission from the Middle East to India

Simulasi merupakan suatu teknik yang berfungsi untuk merepresentasikan sebuah masalah atau keadaan yang ingin dianalisis. Pada umumnya simulasi dilakukan untuk kondisi-kondisi yang terlalu mahal atau tidak mungkin dilakukan melalui eksperimen. Salah satunya adalah simulasi Molecular Dynamics (MD). MD merupakan simulasi yang biasanya digunakan untuk menyelesaikan masalah yang berbasis hukum fisika dalam kehidupan sehari-hari, seperti gerak partikel, molekul atau protein. Selain itu bisa juga digunakan untuk memprediksi karakteristik zat padat, sampai prediksi lalu lintas. Untuk melakukan simulasi MD dibutuhkan algoritma yang memberikan tingkat akurasi dan efesiensi yang tinggi. Algoritma Velocity Verlet dan algoritma Beeman digunakan untuk mencari kecepatan dan posisi partikel terhadap waktu. Pada tugas akhir ini, kedua algoritma tersebut digunakan untuk melakukan simulasi MD. Parameter input yang digunakan sebesar 32, 108, 256 dan 500. Dengan suhu 0°K, 84,4°K dan 91,8°K. Selama prog...

Vibration-induced mechanical fatigue in process piping is a critical integrity threat in high-energy gas production facilities. These failures often occur without prior warning, cannot be detected using conventional non-destructive testing (NDT) per API 570, and may result in safety incidents, unplanned shutdowns, and environmental releases. This white paper presents an integrated methodology that combines Energy Institute (EI) vibration guidelines, piping stress analysis, operational deflection shape (ODS) studies, modal analysis, and system-level dynamic simulation to eliminate excessive vibration-induced fatigue stress. A case study from the ZOHR gas field demonstrates successful mitigation of critical piping failures without redesign or process shutdown.

The recent developments in sensor, computing, communication and software technologies have brought about a new concept: the Sensor Web. A Sensor Web is a macro-instrument consisting of a heterogeneous, intelligent, spatially distributed sensors deployed to monitor and explore the environment. Open Geospatial Consortium's (OGC) Sensor Web Enablement (SWE) initiative provides an infrastructural framework to integrate autonomous sensor webs into Spatial Data Infrastructure (SDI). The integration of sensor web-based real/near real time information into SDI would culminate in a new level of spatio-temporal decision support for critical application scenarios for climate, natural resources, environment, disaster management, critical infrastructure protection, homeland security and emergency response issues. This new level of decision support is achieved by the formalized knowledge of the facts and circumstances of the environment. However, there lacks a system in current SWE architecture that incorporates the rule based facts of the real world scenarios. This research work is an effort to conceptualize and develop an alerting geo-service that is capable of incorporating real world environmental, spatial and temporal rules that will help to get an in-depth insight of the real world phenomena for better decision making. Based on the use case scenario of flood early warning, a service is envisioned and designed that allows definition of spatio-temporal and observational rules pertaining to a flood event. The service communicates with underlying Sensor Collection Services (SCS) for sensor observation data and validates the data against predefined threshold rules. The service dispatches alert notifications to the subscribers based on the fulfillment of these threshold rules. Such an alerting service is realized through an Active Web Alert Service (AWAS). The AWAS extends current SWE components by incorporating a new service for alert notification as envisioned by Open Web Service 2 (OWS 2). The AWAS is built on top of event based communication model, a new communication paradigm for distributed GI-Services. The event based communication model enables proactive communication pattern between the AWAS and SCS(s), enabling active dispatch of sensor observation data when the rules are satisfied. The event based model enables anonymous and asynchronous communication between SCS(s) and the AWAS. SCS(s) publishes its observations as events to the event service and the AWAS subscribes to the events defined by rules with the event service. A notification is sent to the subscriber AWAS when the published and subscribed events are matched.

This article investigates how Colum McCann's Twist converges infrastructural and narrative forms to self-reflexively engage with the invisibility of urgent issues like climate change and digital colonialism. Drawing on infrastructural studies, New Formalism, and narrative theory, I argue that the novel is well-equipped to explore the middle ground between the materiality and abstraction of infrastructure. Structured around two opposing forms—the rerouting of data and plots, and the repetitive patterns of routine—the article shows how Twist formally mirrors the logic of the undersea cable network, challenging conventional narratives of disruption and repair and reaffirming the relevance of material maintenance.

The safety of hazardous production facilities is directly related to the reliability of pipeline systems, which must be ensured regardless of environmental conditions. Accidents on pipeline sections can have catastrophic consequences associated with damage to human health and the environment. Damage to the metal of pipeline elements during operation due to internal corrosion occurring under the influence of the working fluid is one of the main reasons for failure. This study aims to develop an improved butterfly check valve (BCV), which is a pipeline element. For this purpose, various structural materials used in the production of check valves were analyzed, and the changes in their mechanical properties under the influence of temperature were also considered. Based on this material, a butterfly check valve was developed. The stress-strain state of the developed structure was assessed using the finite element method (FEM). Strains, stresses, and displacements were calculated to evaluate valve performance. These calculations are necessary to determine the most loaded elements of the BCV at the maximum and minimum ambient temperatures. The following conclusions were obtained: X6CrNiTi18-10 stainless steel grade is the most suitable material for piping systems transporting liquids in production facilities. On the basis of the simulation results, the values of equivalent stresses, maximum strains, and displacements were obtained. The research results confirmed the performance of the improved design, the unhindered motion of the working fluid in the working direction, and the convenient connection to horizontal and vertical sections of the pipeline.

Accurate subsea positioning is an indispensable element of offshore pipeline installation operations, particularly within deepwater environments where even minor misalignments can precipitate severe safety hazards, environmental degradation, and substantial economic liabilities. Conventional acoustic-based positioning systems, including Ultra-Short Baseline (USBL) configurations, have historically served as the workhorse for subsea positioning. However, these systems face pronounced challenges in deepwater scenarios, such as signal multipath propagation, acoustic noise interference, dynamic vessel motions, and water column stratification, which collectively compromise their positioning precision. This study proposes an advanced integration of an Inertial Navigation System (INS) with USBL technology, employing a tightly coupled Extended Kalman Filter (EKF) framework to synergistically fuse complementary sensor streams. The proposed approach is designed to mitigate drift inherent to inertial solutions while stabilizing absolute positioning fixes under challenging acoustic conditions. A comprehensive empirical field campaign conducted in a representative deepwater environment, at a nominal depth of 1500 meters, demonstrates that the integrated INS-USBL architecture reduced lateral positioning errors by approximately 38% relative to USBL alone, with improvements in vertical accuracy of 26%. These advances translate directly into significant operational and economic advantages, including the reduction of corrective relay operations and enhanced compliance with increasingly stringent subsea environmental regulatory frameworks. The results provide compelling evidence for the adoption of multi-sensor fusion techniques in offshore engineering, highlighting a promising direction for future research in the integration of Doppler Velocity Logs (DVL) and seabedreferenced aiding sensors to achieve centimeter-level positioning tolerances. The findings of this work support safer, more sustainable, and more cost-efficient subsea pipeline installations, thereby contributing to the broader objective of resilient offshore energy infrastructure.

This paper presents a numerical study for preliminary assessment of the dynamic responses and allowable sea states for the installation of an offshore wind turbine (OWT) tower and rotor nacelle assembly (RNA) based on a novel method. This method is based on the inverted pendulum principle and consists of various sequential activities for which the allowable limits of sea states need to be established. For critical installation activities, numerical analyses methodologies have been applied to model the actual operations. For the parameters limiting the execution of the operations, response statistics are provided. It is found that at least 45 seeds are required to achieve convergence of snap force statistics during the OWT lift-off. The response statistics are used to calculate a characteristic value corresponding to a target probability of non-exceedance. For the lift-off and mating operations, these characteristic values are compared with the allowable limits of the response parameters to establish the allowable limits of sea states. In addition, sensitivity study on key modeling parameters are conducted. Spring coefficients of contact elements and hinged connections, winch speed, and hoist wire stiffness are shown to be important modeling parameters. The results provided in this paper are important for future finite element modeling (FEM) and cost-effective design of the structural components.

In the Tahe oilfield in China, heavy oil is commonly lifted using the light oil blending technology. However, due to the lack of light oil, the production of heavy oil has been seriously limited. Thus, a new compound technology of light oil blending and electric heating is discussed in this paper, which aims to reduce the usage of light oil and maintain heavy oil production. Based on the mass, momentum and energy conservation, a pressure and temperature coupling model is developed. The heat-transfer parameters are calculated by using Hasan-Kabir method and the pressure drop is calculated by using Hagedorn-Brown method. The model also considers the blend effect of light oil and heavy oil, and the heating effect of electric rod. Example calculation shows that only electric heating or light oil blending technology cannot meet the requirement. The amount of light oil used can be reduced by combining the electric heating technology.

Upon exiting the refinery, fuel products are distributed to vessels, from vessels to the terminals conducting the activities of fuel storage and distribution operations, and from terminals to stations via road tanker. Problems of loss in the product quantities occur after the movements of displacement of the product in terminal tanks and simultaneous the movements during filling operations. In this paper all operation processes of one of the fuel oil terminal in Turkey. The fuel products were received upon the unloading of the vessel and storage and distribution activities were carried out in this terminal. The elements causing loss during the terminal operation processes were examined with the failure modes and effects analysis (FMEA) technique. According to this analysis, the fields for which measures would be taken with precedence and a solution approach were presented for the company. While this approach is providing the causes of occurrence of failures as well as the control of loss for the company, the risk of fire and spillage likely to occur can be prevented as well.

Complaints about engineering codes and standards being overly restrictive are not new, particularly when there are requirements for a licensed Professional Engineer to take responsibility for the design. The company OceanGate announced in 2016 their next submarine would not follow the published codes and standards. In response to industry pushback, OceanGate published their explanation of how engineering codes and standards stifle creativity and innovation. Their submersible, the Titan, made 13 dives to the Titanic wreck site before imploding on the 14th dive on 18 June, 2023. The United States Coast Guard (USCG) held the Marine Board of Investigation, a joint hearing with the National Transportation Safety Board (NTSB), during 16-27 September 2024 to obtain testimony and present preliminary findings. A final report has not been developed at the time of this paper's submission. This paper will address how Verification, Validation, and Uncertainty Quantification (VVUQ) processes are key enablers for successful innovation and are directly applicable to the Titan. This will also illustrate how VVUQ methods can be used in a spectrum. While "cook book" engineering has the VVUQ elements "baked in," variations of code-based designs with limited novelty can be addressed with "deterministic VVUQ" approach while radically novel designs require the traditional stochastic "nondeterministic VVUQ".

During the installation of a subsea module it is extremely important to guarantee that the structure will not be damaged, as this would imply in elevated costs and hazards to the environment. In order to minimize these risks, the installation process can be simulated inside software that use numerical modeling by considering different environmental conditions, so that a safer procedure with more adequate operational window can be achieved. However, these software can be very expensive, and this kind of simulations usually takes a long time, making it very convenient when one has access to a simplified model, capable of simulating different conditions in a short period of time, while still providing reliable results. This paper presents a simplified model developed in Python programming language, which uses a fourth-order Runge-Kutta method to solve the equation of motions that governs a vertical installation process. The installation ship's motions were applied to the top of the cable, simulating its connection to a crane aboard, and then the motions of the suspended equipment and the cable tension could be calculated. The results obtained through the use of this simplified model were then compared to the ones obtained through the use of a much more complex model using the OrcaFlex® software and to experimental data.

Penelitian ini mengkaji pengaruh parameter proses calendering terhadap kualitas lapisan polimer pada industri kertas melalui pendekatan Systematic Literature Review (SLR) dan analisis perbandingan berbasis model numerik. Parameter utama seperti tekanan rol, suhu permukaan, kecepatan rol, dan kelembaban substrat dianalisis terhadap hasil akhir berupa ketebalan, kehalusan, dan kilap permukaan kertas. Studi ini menunjukkan bahwa interaksi kompleks antar parameter tersebut sangat menentukan kualitas lapisan, dan pemodelan numerik berbasis Finite Element Method (FEM) dan Computational Fluid Dynamics (CFD) efektif untuk memprediksi distribusi tekanan serta deformasi lembaran. Hasil juga mengungkap adanya gap riset dalam korelasi langsung antara parameter calendering dan hasil pelapisan pada kertas berpori. Temuan ini memberikan dasar ilmiah untuk pengembangan sistem kontrol proses calendering yang lebih presisi dan adaptif dalam industri pulp dan kertas.

Small bore piping failures are one of the main problems occurred in the gas processing plant. These failures had caused plant interruption such as product leakage, unscheduled plant downtime and also impact on plant safety and reliability. Based on the data analysis, the most common failure is due to the internal erosion effect at elbow and tee joint pipe. This project is to investigate internal erosion effect at elbow and tee joint small bore piping. This is done by using the Computational Fluid Dynamic (CFD) analysis to validate the actual case study. By creating the models and then simulating with CFD, it is found that the failure occurred at the elbow pipe and tee joint pipe as the pressure concentration occurred there. Therefore, in order to prevent piping failure due to the internal erosion effect, proper piping design and material selection and proper inspection planning need to be done in the future. The methods to improve piping design and material are increasing pipe diameter, increasing the wall thickness and using more erosion-resistant alloys. For inspection planning, do prioritize inspection on suspected area based on Risk-Based Inspection (RBI) and perform non-destructive testing such as Ultrasonic testing and radiography testing. As a conclusion, the significance of this research would be important to solve internal erosion effect in small bore piping.

The appearance of the propeller hull vortex (PHV) has been investigated using the FINFLO RANS solver. This specific phenomenon occurs when solid surfaces placed in the neighbourhood of the propeller prevent the natural flow contraction resulting from the local flow acceleration. As the propeller blades near the solid surfaces may not obtain enough mass flow from the inlet -i.e., the propeller is starved of water -the flow may reverse locally so that water is sucked from the outlet. The small tip clearance combined with the low advance number as well as the geometry of the solid surfaces may affect the inception of the PHV. Time-dependent computations were carried out at seven advance numbers. During the analysis of the results, several quantities were examined to detect the inception of the PHV. Streamlines were found to be the best technique to trace the vortices from an extremely complex flow field. The flow patterns on the flat plate were compared to published experimental observations using the limiting streamlines along the plate. Flow patterns similar to those discovered in the experiments were also obtained by RANS simulations, so the RANS method is able to predict the occurrence of the PHV at least on a qualitative level.

The DF1-1 submarine pipeline was investigated using a dual-frequency side-scan sonar and a swath sounder system. More than a hundred scour pits under the pipeline were found, most of which have caused the span of the pipeline to increase and threatened its safety. The maximum allowable free span length (MAFSL) of the pipeline was determined through the limitations regarding maximum allowable stress under static or quasi-static loads and the onset of Vortex Induced Vibrations (VIV) under different hydrodynamic actions. The results show that the MAFSL under static conditions is 56 m. However, the MAFSLs are 30 m and 20 m under ordinary weather conditions and hurricane-induced currents for the 100-year return period, respectively, to avoid VIV as calculated by using the highest safety class factor. It is suggested that spanning pipelines longer than 20 m should be supported. Additionally, eight successive spans which may also threaten the pipeline were proposed. The most hazardous scour pits are along the pipeline section from KP42 to KP51.

Hydrate formation occurs in pipelines beyond sea water depth of 3000 ft. with uniform ocean temperature of 38-40 o F, and pressure as low as 100 psig. Plugged-up leads to pressure drop and decreased flow rate, disrupting crude oil transportation. This paper reported the detailed investigation of hydrates particles diameters and interfacial area density in relation to the hydrate deposition in deepwater pipeline. The work focused on the pipe bend section where there is an abrupt change of flow momentum. The flow was assumed isothermal and constant mean hydrate particle size. It was found that initial hydrate particulates' diameter has the most significant impact on the deposition thickness, causing significant increase of thickness in comparison to other factors. It is concluded that the prevention of hydrate plugging should focus primary on controlling the hydrate's mean particle sizes.

Ultra-Short Baseline Positioning System for Full Ocean Depth is presented in this paper. A planar array is used to complete the intelligent beam tracking for improving signal-to-noise ratio. Spatial spectrum estimation technology is realized for two-dimensional direction of arrival estimation. And the feedback positioning results can be employed to track the target and achieve ultra-long-distance positioning. Quadri-Phase Shift Keying (QPSK) orthogonal separation code is proposed and designed to resist strong noise interference with spikes. The sea trial results show that the maximum detection distance is 15133m and the real-time positioning accuracy is higher than 0.3% of the slant range.

The optimum sizes of the pipeline can be determined using different steel grades and different geometrical and loading conditions. The paper shows an initial parametric study on these conditions to find the lowest self mass. The number of tubes, diameter and thickness are variables. Spanlength, steel grade and loading are considered to be given parameters. Another constraint is transfer capacity. The mass per unit length difference between the smaller and larger diameters and thicknesses is significant, which emphasizes the necessity of optimization.

This paper proposed a straight-line survey scheme for misalignment calibration of a USBL (Ultra Short Baseline) positioning system. Under the scheme of straight-line survey, USBL positioning errors arising from heading, pitch, and roll misalignments are derived, respectively. The effect of each misalignment angle and how the differences can be used to calibrate each misalignment angle in turn are presented. An iterative algorithm that takes advantage of the geometry of position errors resulting from angular misalignments is then proposed for estimating alignment errors. The performance of the iterative algorithm is evaluated through simulation and field experiment. The simulation and experimental results have demonstrated the effectiveness of the iterative scheme in finding alignment errors. The proposed algorithm yields a very rapid convergence of the solution series; usually the estimates obtained in the first iteration approximate to true values, and only few iterations are neces...

A numerical method to analyse the effect of the application of polymer coatings on the bending resistance of steel pipeline joints is presented. Experiments were conducted to investigate the influence of the thickness of polymer field joint coatings and the cooldown time provided after applying the coatings on the behaviour of pipeline joints when being bent during reeling operations. Temperature readings were obtained from thermocouples inside the polymer field joint coating during the application process, and pipeline ovality measurements were taken during mechanical testing. Thermal modelling of the coating application procedure was developed using COMSOL Multiphysics modelling software; this model is validated against the thermocouple readings, while a mechanical model simulating the pipe being bent to a reel developed in Abaqus finite element modelling software is described. The temperature outputs, areas of stress concentration and pipe ovalities obtained from the experiments are shown to be predicted accurately by the numerical models. After successful validation of the numerical models, a parametric study assessing the influence of field joint coating thickness and cooldown times is described, whose results are used to find an optimal solution to reduce the cooldown time required prior to bending the pipe without buckling.

Corrosion induced firetube failure is a common problem for most oilfield producers and operators. This paper addresses corrosion prevention inside heater treaters and separators, including firetube protection, through the use of galvanic anodes mounted in Victualic-style fittings. This paper addresses the three primary criteria that must be considered when analyzing an anode for use in heater treaters or separators (fired vessels): safety, effectiveness, and cost.

Detail pipe soil testing and back analysis investigations of operational pipelines sited on different soil types and seabed terrains has identified time and cyclic displacement varying axial and lateral soil restraint mechanisms. These cyclic Pipe Soil Interaction (PSI) mechanisms have been shown to have significant impact on the through-life displacement response of operational pipelines. The inclusion of cyclically varying PSI input parameters into 3D global buckling and pipe walking models via appropriate Finite Element (FE) sub-routines, have been qualitatively verified on Wood Group projects and enable realistic assessments of pipeline integrity and through-life operational risk. This paper describes the impact of pipe soil modelling issues on operational pipeline responses and the detail axial, lateral and 3D pipe soil sub-routines developed in-house to capture their global behavior within cyclic FE simulations.