Liquefied Natural Gas Transportation Research Articles

Study on damaged expanded water-repellent perlite insulation integrating neural network and simulation on temperature field and Boil-off Rate in a Liquefied Natural Gas Cargo Containment

The temperature field and Boil-off Rate (BOR) of the cargo containment system (CCs) in the LNG (Liquefied Natural Gas) carrier are directly impacted by the thermal performance of insulation, which has an adverse effect on the structural safety and commercial feasibility of LNG transportation. However, the potential damage to hydrophobic layer of expanded perlite during the processes of filling, storage, and transportation can lead to undesirable increases in water absorption, thermal conductivity, even the risk of insulation failure. To investigate the variations in the thermal conductivity of damaged expanded water-repellent perlite used in CCs of LNG carrier, The variations in the thermal conductivity of expanded water-repellent perlite are tested using a guarded hot plate apparatus extending down to liquid nitrogen temperatures under the combined influence of moisture content and damage rates. Furthermore, heat transfer models are established, and the accuracy of the mathematical models is validated using experimental data collected from LNG carrier CCs. A Back-propagation Neural Network is used to conduct sensitivity analysis and predictions based on the experimental results. The results show that both the breakage rate and water content have detrimental effects on insulation performance. Specifically, under equatorial sailing conditions, 450 mm-thick expanded water-repellent perlite show respective BOR increases of 22.8% and 116.4%. With 530 mm-thick expanded water-repellent perlite, BOR increased by 20.7% and 112.1%, respectively, even exceeding the daily BOR limit for LNG cargo. Analyzing temperature field and BOR provides essential insight for evaluating the thermal insulation performance of the structural system in the NO 96 LNG carrier.

Numerical study of thermodynamic and hydrodynamics in a type B LNG cargo tank during sloshing excitation

The hydrodynamics and thermodynamics properties in a type B liquefied natural gas (LNG) cargo tank during sloshing excitation are investigated in this research using the numerical model that takes phase transition and exterior heat leaking into account. In order to forecast the movement of the vapor–liquid interface, the mesh motion treatment in conjunction with the volume of fluid (VOF) approach is used. The user-defined function (UDF) realizes the sloshing excitation. Its viability is confirmed by comparing the numerical model with related fluid sloshing experiments. The impacts of various sloshing periods, amplitudes, and filling rates on the hydrodynamics and thermodynamic properties were examined using numerical analysis of heat flux, the mass of boil off gas (BOG), internal energy, and pressure in the LNG cargo tank. Even with varying filling rates, the numerical findings demonstrate that resonance happens if the sloshing period corresponds to the natural period. As a result, this research serves as essential for gaining a thorough comprehension of thermodynamic, hydrodynamics and BOG mass properties during sloshing excitations in marine LNG transport.

Environmental implications of LNG usage: A comparative review of policies in the USA and Africa

This study presents a comparative review of the environmental implications of Liquefied Natural Gas (LNG) usage in the United States (USA) and Africa, examining the policies that govern LNG-related environmental concerns in these regions. Recognizing the global significance of LNG as a pivotal energy source, the analysis explores the distinct policy landscapes shaping its utilization in two diverse contexts. In the USA, where LNG has emerged as a key component of the energy mix, the study scrutinizes federal and state-level environmental policies. This includes regulations governing the extraction, production, and transportation of LNG, with a focus on mitigating emissions, preserving air and water quality, and ensuring ecological sustainability. The review also encompasses the regulatory frameworks promoting the integration of LNG into the broader strategy for reducing carbon footprints in the country. In contrast, the study delves into the nuanced environmental policies across multiple African nations where LNG is increasingly gaining prominence. Africa, with its unique environmental challenges and diverse regulatory approaches, presents a dynamic landscape for LNG utilization. The analysis explores how environmental policies address the specific needs and challenges of African nations, emphasizing sustainable practices, biodiversity conservation, and community welfare. By undertaking this comparative review, the study aims to highlight commonalities and disparities in the environmental policies governing LNG usage in the USA and Africa. Understanding these variations can contribute to the development of informed and context-specific approaches to LNG-related environmental challenges. Additionally, the study seeks to identify areas for potential collaboration and knowledge exchange, fostering a global dialogue on sustainable LNG practices. Ultimately, the findings aim to inform policymakers, industry stakeholders, and environmental advocates, promoting responsible LNG usage that aligns with both regional and global environmental goals.

Optimized integration of solar energy and liquefied natural gas regasification for sustainable urban development: Dynamic modeling, data-driven optimization, and case study

As sustainable urban communities continue to seek alternative energy sources, this study explores the inclusion of renewable resources in the energy mix. With a focus on liquefied natural gas (LNG) regasification, parabolic trough solar collectors, dual-loop power cycles, proton exchange membrane electrolysis, and hydrogen liquefaction cycle, this research conducts a comprehensive examination of an integrated system. The primary objective is to provide a diverse range of valuable outputs, including electricity, liquefied hydrogen, desalinated water, and cooling for coastal areas. Through careful analysis of regional geographic features, San Francisco emerges as a suitable location due to its favorable solar radiation intensity and existing LNG transportation infrastructure. The findings reveal that the integrated system has the potential to deliver approximately 5750.4 MWh of cooling, 14988.85 MWh of electricity, and 1,491,084 m3 of fresh water, thereby significantly contributing to the city's utility demands. In terms of data-driven optimization, artificial neural networks serve as intermediary mechanisms to establish correlations between the developed code and the optimization algorithm. The results demonstrate that the optimized system exhibits notable improvements in production capacity. Moreover, significant reductions in the levelized cost of electricity (0.19 Cent/kWh), fresh water (1.22 Cent/m3), and hydrogen (0.08 $/kg) are observed. Although the optimized case entails a 16.11% higher cost rate compared to the base system, it is projected to generate a 25.59% higher profit over its operational lifespan. Additionally, the payback period of the optimized system is shortened by 6.31%, making it an attractive long-term investment for sustainable urban development.

Technological innovations in the LNG sector: A review: Assessing recent advancements and their impact on LNG production, transportation and usage

This paper thoroughly explores the recent technological innovations in the Liquefied Natural Gas (LNG) sector, examining their impact on production, transportation, storage, and usage. The study delves into the evolution of the global LNG market, emphasizing the critical role of technological advancements in shaping the industry's future. The aim is to analyze these innovations, assess their environmental and economic impacts, and explore the influence of geopolitical and market dynamics. By employing a comprehensive literature review, the paper utilizes a multi-criteria decision support framework to select relevant technological innovations and assess their impacts. This methodology integrates environmental, social, policy, and economic dimensions, offering a holistic view of the LNG sector's technological landscape. The findings reveal significant advancements in LNG production technologies, such as green ammonia and biogas, enhancing sustainability and efficiency. Innovations in LNG transportation, including optimized carrier fleets and storage systems, have revolutionized the industry, improving economic viability and safety. The emergence of Floating LNG (FLNG) technologies marks a pivotal development, unlocking new gas monetization possibilities. The study also highlights the environmental benefits of these innovations, including reduced greenhouse gas emissions and their synergy with renewable energy systems. The paper concludes that while technological advancements offer substantial benefits, they also present challenges, including high investment costs and regulatory complexities. It recommends continued innovation, strategic collaborations, and supportive regulatory frameworks to fully exploit the potential of LNG technologies. As the global energy landscape evolves, the LNG sector is poised to play a crucial role in the transition to a more sustainable and efficient energy future.

Liquefied Natural and Petroleum Gas Carriers: An Analysis of the Potential Dangers, Safety Measures and Risk Factors

Liquefied natural gas (LNAG) and liquefied petroleum gas (LPG) are extensively used as environmentally friendly and highly efficient energy sources. Nevertheless, the movement of goods by water has inherent risks to both the environment and human well-being. This study examines the potential hazards, safety precautions, and risk factors related with the transportation of Liquefied Natural Gas (LNG) and Liquefied Petroleum Gas (LPG) carriers. This research also aims to examine the perspectives and opinions of individuals working in the LNG and LPG business on the possible hazards, safety precautions, and risk elements related with LNG and LPG carriers. A survey was performed among a heterogeneous sample of 100 individuals from various areas of the business.The analysis reveals that a huge part of individuals expresses problem approximately ability risks associated with LNG and LPG transportation. While self belief in present day safety measures is extraordinary, there are dissenting evaluations, suggesting regions for improvement. Safety protocols, emergency reaction approaches, and the qualifications of personnel also showcase numerous perceptions. Environmental impact emerges as a chief challenge, highlighting the need for similarly research. Transparency and communique within the industry show blended responses, emphasizing potential regions for enhancement. Participants generally well known the fantastic impact of technological advancements, but neutrality suggests various views. Insurance and liability mechanisms are perceived positively, however dissenting critiques underscore areas of skepticism. International cooperation and requirements garner combined responses, indicating ability possibilities for global collaboration. The take a look at concludes by exploring the alignment between public notion and actual protection measures. While a massive component is glad, dissenting and impartial responses indicate room for development in aligning public belief with enterprise protection realities. Overall, this research contributes valuable insights for stakeholders, guiding future safety enhancements and coverage concerns in the LNG and LPG transportation area.

Techno-economic analysis of natural gas distribution using a small-scale liquefied natural gas carrier

The design of the gas distribution for small-demand power plants located on remote islands is logistically challenging. The use of small-scale liquefied natural gas (LNG) vessels can be an option for these logistic problems. This paper aims to conduct a techno-economic analysis of using small-scale LNG vessels for gas distribution to the power plants that are spread across different islands. Route optimisation has been conducted using the capacitated vehicle routing problem method. The ship’s principal dimensions were determined using the aspect ratio from a linear regression of existing small-scale LNG vessels. As a case study, the gas demands for a gas power plant in eastern Indonesia were analysed into four distribution clusters. The results of the techno-economic analysis showed that the four distribution clusters have different characteristics regarding the LNG requirements, location characteristics and ship specifications. The capacity of small-scale LNG vessels feasible in terms of technical aspects varies from 2500, 5000, to > 10,000 m3 with variations in the ship speed depending on the location of the power plants. The amount of cargo requested and the shipping distance was affected to the cost of LNG transportation. The economic assessment proposes that the feasible investment by considering small-scale LNG cargo distribution, from the case study shows that with a ship capacity of 5000 m3 feasible margin rate is ≥ 3 USD/metric million British thermal units with an internal rate of return of 10% and estimated payback period is less than 15 years.

Liquefied Natural Gas Value Chain: A Comprehensive Review and Analysis

AbstractOver the past few decades, the liquefied natural gas (LNG) business has experienced astounding expansion and gained global relevance. LNG has emerged as a key element in meeting the world's rising energy demand while working to cut carbon emissions, since it is a cleaner and more adaptable energy source. The entire process from natural gas extraction to consumption is covered in the presented analysis of the LNG value chain, starting out by looking at the discovery and production of natural gas reserves, highlighting important innovations and methods used during the extraction stage. The procedures used to treat and purify natural gas in order to meet the strict standards for liquefaction are detailed. Analysis of the liquefaction process reveals numerous liquefaction technologies, e.g. the well‐known conventional liquefaction and the cutting‐edge floating LNG and small‐scale LNG facilities. LNG storage and transportation, as critical components in the value chain, are examined in great detail. When the LNG reaches its destination, regasification plays a crucial role in repurposing it as a gas for distribution and consumption. Regasification technologies, such as conventional onshore terminals, floating storage and regasification units, and land‐based regasification facilities, are covered. Concerns regarding methane emissions and the carbon footprint, the potential for reducing greenhouse gas emissions through new technology, the environmental impact of LNG, and the economics of LNG are also considered across its value chain.

A vacuum measurement method of liquefied natural gas vacuum pipeline based on the principle of temperature field.

LNG (Liquefied Natural Gas) has widely been used as an efficient and clean energy source. However, the storage and transportation of LNG is a big problem that the vacuum degree is difficult to measure in LNG pipeline transportation, especially without the vacuum test port. A measurement method for the vacuum degree of the LNG pipeline based on the second law of thermodynamics (the principle of temperature field) was proposed, and the vacuum degree of the pipeline was measured in this paper. The vacuum degree was obtained as a function of the ambient temperature T0 and the outer wall temperature T1 of the outer tube. The feasibility of this method was verified through test bench and field experiments, and the functional expressions of the outer wall temperature of the outer pipe and pipeline vacuum degree at 22, 24, and 26 °C were combined and verified, which provided a powerful way for measuring LNG pipeline vacuum.

Integrated Operational Characteristic Simulations of a ±100 kV/1 kA Superconducting DC Energy Pipeline Based on Multi-Physics Field Interaction

The DC superconducting energy pipeline (DC SEP) is a promising technology, which has the ability to transmit electricity and fossil energy such as liquefied natural gas (LNG) at the same pipeline so that LNG could serve as the refrigerant for the high-temperature superconducting (HTS) cables. The collaborative transportation of electricity and LNG increases the efficiency while lowering the cost. However, the operation performance of the SEP, which is crucial for HTS cables and LNG, is of greater complexity on account of multi-physics interactions. Herein, a ±100 kV/1 kA SEP model with electric, magnetic, fluid and thermal fields is established in COMSOL Multiphysics to analyze the temperature distribution of SEP via parametric scanning on SEP heat leakage and LNG flow rate. Finally, the relationship between temperature rise and LNG flow rate of a SEP has been estimated based on the interactions of the multi-physics fields. The results indicate that the temperature rises by 11.6 K for every kilometer of SEP. Moreover, the influences of heat leakage and LNG flow on temperature rise are revealed. Temperature rise increases proportionally with heat leakage and it decreases not monotonously with LNG flow rate. This study validates the feasibility of SEP and provides the theoretical references for the demonstration of SEP.

Characterization of Medium-Scale Accidental Releases of LNG

The need for sustainable energy sources has recently promoted the use of liquefied natural gas (LNG) as a low-carbon fuel. Although economic evaluations indicate the transportation of LNG as a convenient solution for long distances between markets and reservoirs, several concerns are still present regarding its safe use and transportation. The preliminary evaluations performed in this work indicate that credible releases deriving from real bunkering operations result in pools having a diameter smaller than 1 m, which has been poorly investigated so far. Hence, an experimental campaign devoted to the characterization of a medium-scale release of LNG was carried out either in the presence or absence of an ignition source. An evaporation rate of 0.005 kg s−1 m−2 was collected for the non-reactive scenario, whereas the measured burning rate was 0.100 kg s−1 m−2. The reduction factor of 20 demonstrates the inaccuracy in the commonly adopted assumption of equality between these values for the LNG pool. Flame morphology was characterized quantitatively and qualitatively, showing a maximum ratio between flame height and flame diameter equal to 2.5 and temperatures up to 1100 K in the proximity of the flame.

Aerogel Technology for Thermal Insulation of Cryogenic Tanks—Numerical Analysis for Comparison with Traditional Insulating Materials

The traditional choice of insulation material for liquefied natural gas (LNG) transportation with cryogenic tankers is the back-filled perlite-based system. However, aiming to further cut down the insulation cost, spare additional arrangement space, and provide safety in installation and maintenance, the requirement of looking for alternative materials still exists. Fiber-reinforced aerogel blankets (FRABs) could represent good candidates in designing insulation layers for LNG cryogenic storage because of their ability to ensure adequate thermal performance without the need to create deep vacuum conditions in the annular space of the tank. In this work, a finite element method (FEM) model was developed to study the thermal insulation performance of a commercial FRAB (Cryogel ® Z) for application in cryogenic storage/transport LNG tanks, comparing it with the performance of traditional perlite-based systems. Within the reliability limits of the computational model, the analysis proved that FRAB insulation technology gave encouraging results and might be potentially scalable for transporting cryogenic liquid. In addition to demonstrating superior performance in terms of thermal insulating efficiency and boil-off rate over the perlite-based system, as far as a perspective of cost savings and space gain, FRAB technology allows for higher levels of insulation without vacuum and with lower thickness of the outer shell, which is therefore beneficial for storing more material and lightening the weight of the LNG transportation semitrailer.

Reviewing the impact of LNG technology advancements on global energy markets

Rapid technological advancements in Liquefied Natural Gas (LNG) have catalyzed a transformative shift in global energy markets. This review delves into the profound impact of LNG technology advancements, exploring their multifaceted consequences on the dynamics of the energy landscape. The evolution of LNG technologies, spanning liquefaction, transportation, and regasification processes, has ushered in a new era of energy accessibility, sustainability, and market competitiveness. The burgeoning role of LNG as a cleaner and more versatile fuel source is examined against the backdrop of global efforts to address climate change. Environmental considerations, carbon reduction goals, and the burgeoning demand for cleaner energy sources are driving the increasing adoption of LNG in the global energy transition. Government initiatives supporting LNG adoption and renewable energy policies influencing its utilization are dissected to comprehend the intricate policy factors shaping global LNG consumption. Economic drivers, including cost competitiveness and market dynamics, play a pivotal role in shaping the global LNG landscape. The review assesses the economic growth and industrial demand for LNG, providing insights into the intricate relationship between economic factors and the surge in LNG consumption. Additionally, the expansion of global LNG production capacity, exploration of unconventional gas resources, and geopolitical influences on LNG supply patterns are thoroughly scrutinized to provide a comprehensive understanding of the forces steering LNG trade dynamics. The regional dynamics in LNG trade are elucidated with a focus on major economies such as Asia-Pacific, Europe, and North America. The rising demand from these regions, coupled with infrastructure developments and regulatory frameworks, underscores the intricate interplay of factors shaping LNG trade dynamics on a regional scale. Furthermore, the review delves into the geopolitical implications of recent events on LNG markets, scrutinizing trade agreements and geopolitical risks to provide a holistic view of the broader geopolitical landscape impacting LNG stakeholders. In summation, this review provides a comprehensive analysis of LNG technology advancements and their far-reaching impact on global energy markets. As technological innovations continue to reshape the LNG landscape, this review serves as a roadmap for understanding the intricate interplay of environmental, economic, regional, and geopolitical factors that collectively define the contemporary dynamics of the LNG industry.

The Problem of Utilization of Liquefied Natural Gas Vapor at Large-scale LNG Plants

The liquefied natural gas (LNG) is stored under low overpressure in a saturated state in large-capacity tanks with multilayer thermal insulation. Owing to the input of heat from the environment through thermal insulation, LNG is continuously evaporated. Since natural gas is a multicomponent mixture, LNG vapors are enriched with its low-boiling components, then the supply of heat from the environment reduces the amount of liquid in the reservoir and changes its chemical composition. Similar phenomena occur during LNG transportation. The present paper deals with the problem of LNG vapor utilization during its storage and transportation. Information is presented on the causes of the LNG vapor formation (boil-off gas) and methods for its disposal during storage and transportation to consumers. A numerical experiment was performed based on the data of LNG storage in large-capacity storage facilities at the Yamal LNG plant. The technique consists of the estimation of material flows toward the system of accumulation and extradition of LNG. The results show that the vapor flow generated from the inflow of new LNG portions into the storage significantly exceeds that generated from the heat supply from the environment.

Investigation of cryogenic friction and wear properties of Invar 36 alloy against Si3N4 ceramic balls

The existing materials for liquefied natural gas (LNG) cryogenic submersible pump bearings are very susceptible to wear and failure in LNG environments where oil lubricants and greases are ineffective, posing a major hazard to the safety of LNG storage and transportation. Therefore, searching for a type of material with excellent cryogenic tribological properties for improving the life of LNG bearings has become a huge challenge for researchers. Invar 36 alloy, as a low expansion nickel-titanium alloy, is used in control instruments, moulds, laser control equipment, and materials of LNG transport hull at temperatures below −162 °C. However, there is a lack of research data in the field of bearings. Currently, the Si3N4 ceramic balls are widely used in ceramic hybrid ball bearings and exhibit excellent tribological properties. In this work, the tribological performance of Invar 36 alloy is mainly investigated against Si3N4 ceramic ball under extremely cryogenic and dry conditions using the modified ball-on-disk tribometer with a cryogenic module, with temperatures as low as −196 °C. All experiments are performed at loads of 0.5 N, 1 N, 1.5 N, and 2 N, and at temperatures of 20 °C, 0 °C, −78 °C, and −196 °C, respectively. The experimental results show that the coefficient of friction (COF) and wear rate decrease with temperature and load, with a minimum value of −196 °C. The Invar 36 alloy exhibits excellent tribological properties, whose COF decreases gradually from 20 °C to −78 °C. However, as the temperature drops to −196 °C, the COF decreases abruptly, reaching a minimum value at −196 °C. On the contrary, the COF gradually increases with load. In addition, a commercial bearing grade material (G95Cr18 steel) is tested and compared under the same conditions, proving that Invar 36 alloy exhibits better tribological properties than G95Cr18 steel, with a wear rate 55.43% lower than G95Cr18 steel at −196 °C. Further simulation comparisons demonstrate that, due to its extremely low coefficient of thermal expansion, Invar 36 alloy exhibits higher toughness and strength than G95Cr18 steel under cryogenic conditions. This study complements the tribological data of Invar 36 alloy and G95Cr18 steel against Si3N4 ceramic balls under different temperatures and loads and provides important theoretical guidance and technical support for the bearings’ future development of LNG cryogenic submersible pump.

Study of Strength Properties of the Designed Tank for Marine Transportation of Liquefied Natural Gas in the Arctic Conditions

Liquefied natural gas is one of the environmentally friendly alternative fuels, and there are various ways to transport it. Despite the high cost of the production of transportation vessels, it is marine transportation that is most common in harsh arctic conditions. The article proposes the design of the carrier tank, which consists of spherical and cylindrical parts with elliptical bottom and bunker. Equatorial belt and support element are used as a mechanism to attach the tank to the ship's hull, but it can be with different configuration, e.g., in the form of skirt or set of struts. Based on numerical simulation results, conclusions are made that the second option of reinforcement is preferable as it is 44% less in weight while providing the required carrying capacity, which can be an advantage when using several tanks on one ship. The tank design under consideration is not subject to the "sloshing" effect and has an increased capacity by 11.5% compared with the fully spherical design.

Exhaust emissions reduction and fuel consumption from the LNG energy system depending on the ship operating modes

In today’s environment of increasing pressure to reduce fuel consumption and emissions of carbon dioxide (CO2) and nitrogen oxides (NOx), the LNG (Liquefied Natural Gas) transportation industry is growing in size and influence. In this context, further efforts are needed to improve the energy efficiency of LNG marine energy power plant. The LNG vessels and their equipment considered in this study have different power consumption requirements depending on the vessel’s mode of operation (loading/unloading, maneuvering, anchoring, at sea, etc.). For each ship mode, where the power plant requirements are the same, the specific fuel consumption (SFOC) and exhaust emissions, NOx and CO2, are compared with a different number of engines in the network to find the optimal number of engines in the network, considering both the safety aspect and the port requirements. An analysis was performed showing the efficiency of the on-board power management system (PMS) in terms of manual load sharing between engines. A comprehensive analysis of the data and its comparison led to the conclusion that the manual distribution of power among the engines is the slightly better solution. The obtained results show that further analysis of the number of engines for a given load with minimum fuel consumption and CO2 and NOx emissions is required.

Forecasting Liquefied Natural Gas Bunker Prices Using Artificial Neural Network for Procurement Management

The LNG price is basically determined based on the oil price, but other than that, it is also determined by the influence of the method of LNG transportation; storage; processes; and political, economic, and geographical instability. Liquefied natural gas (LNG) may not reflect its market value if the destination of the purchase is restricted or the purchase contract includes a take-or-pay clause. Furthermore, it is difficult for the buyer to flexibly manage procurement, resulting in the decoupling of oil and natural gas prices. Therefore, as the LNG bunker price is expected to be more volatile than the marine bunker price in the future, shipping companies need to prepare countermeasures based on scientific forecasting techniques. This study aims to be the first to analyze the forecasting of short-term LNG bunker prices using recurrent neural network (RNN) models suitable for highly volatile data such as time series. Predictive analysis was performed using simple RNN, long short-term memory (LSTM), and gated recurrent unit (GRU) models, which effectively forecast time-series data, and the prediction performance of LSTM among the three models was excellent. LSTM had relatively excellent prediction performance of outliers and beyond. In addition, it was possible to effectively manage ship operating costs with improved forecasting in practice. Furthermore, this study contributes to establishing a systematic strategy for supervisors in global shipping companies, port authorities, and LNG bunkering companies.

Hazard Identification of Liquefied Natural Gas (LNG) Transportation and Storage in DKI Jakarta Province

LNG is an alternative fuel to replace diesel and gasoline. The use of LNG as a fuel has many advantages from various aspects. Besides having advantages, LNG also has disadvantages because it contains dangers in it. LNG is a volatile material that is easily flammable, which causes fires and explosions. Environmental Risk Assessment (ERA) is a systematic method used to measure the magnitude of the risk of a process and product that is a hazard to human health and ecology. By conducting an ERA, the risks and hazards of LNG are known. In carrying out the research, describing the LNG delivery system, identifying hazards in the event of LNG released from the carrier, making accident scenarios along with the outcome events that will occur, collecting data, calculating the frequency of accidents and their consequences, determining existing risks, and providing preventive actions, and mitigation. Hazard evaluation was determined using fault tree analysis (FTA) and event tree analysis (ETA). Based on identifying hazards to the storage and transportation of LNG, it is classified into category four and server (severe). Scenarios of releasing LNG into the environment in the process of transporting and storing LNG can be caused by several things, including external factors, failure in filling, and failure due to excess pressure so that it can cause fire pools/BLEVE events, cloud vapor explosions, flash fires, and cloud vapors. Based on the level of risk entered into, not tolerable action at the next opportunity.

LNG Transportation Routes Risk Assessment Based on Group Decision Making

The risk assessment of liquefied natural gas (LNG) transportation routes has raised researchers' concerns in recent years, which is a group multi-criteria decision-making (GMCDM) problems that involves experts' opinions from different fields. To improve the effectiveness in evaluating process, this paper proposes a risk assessment method to recognize the potential risks and selects the best LNG transportation route. Firstly, the authors construct the systematic risk evaluation indices, including four first-level indices (political, economic, transportation, and operation and management risks) and nine second-level indices. Then a novel risk assessment method of the LNG transportation route is developed, including opinion representation, consensus measurement and detection, personalized feedback, and selection process. Finally, a scenario analysis is provided to model the risk evaluation process and demonstrate the soundness and applicability of the presented model.