LNG Risk Management

Managing the risks of onshore and offshore LNG facilities via a thorough understanding of the design and key issues associated with liquefied natural gas.

Our multifaceted approach takes into consideration the needs of regulators, engineering contractors and most importantly, you. LNG terminals, send-out facilities and associated pipelines, and power plants around the world rely on our extensive experience to complete QRAs, HAZOP and hazard identification studies, safety integrity level (SIL) reviews, and consequence analysis modeling.

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Our Team

Georges A. Melhem, Ph.D., FAIChE

President & CEO The founder of ioMosaic and internationally renowned expert in the areas of pressure relief and flare systems design, chemical reaction systems, process safety and risk analysis. Read more...

Neil Prophet

Senior Partner Pressure relief and flare systems design project management and engineering expertise for chemical, pharmaceutical and petrochemical companies. Read more...

Daniel Nguyen, PE & PMP

Senior Partner & CTO Responsible for a team of software engineers in the development of ioMosaic’s PSO software and manages pressure relief and flare systems evaluation and design projects. Read more...

John Barker, Ph.D.

Regional Manager The leader of our U.K office and an expert in risk management for the international oil and gas and transportation industries. Read more...

Marcel Amorós-Martí

Senior Safety and Risk Management Consultant The head of our California office is experienced in pressure relief and flare systems design projects for chemical, petrochemical, oil & gas and utilities industries. Read more...

Charles Lea, P.E.

Principal Consultant Oversees our Minneapolis office and has significant experience in pressure relief and flare system design. Read more...

Katherine Anderson, CCPSC

Principal Consultant Experienced project leader in hazard identification, evaluation, functional safety, process safety and risk management. Read more...

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Featured Case Studies

Process Safety Management Quality Audits

Companies have implemented their process safety management programs to comply with OSHA and EPA requirements, but they continue to have accidents. Process safety management programs can meet the letter of the law, but may not be effective in preventing accidents. Traditional audit programs look at documentation and procedures, but do little to evaluate the program quality or effectiveness.

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An international consumer products manufacturer suffered a significant business interruption due to failure of a critical support facility. This incident raised the question of whether there were other critical support facilities that could cause a similar interruption in production or a significant safety or environmental impact.

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The California Energy Commission had been directed to assist in the development of clean alternate transportation fuels. As part of this effort they are supporting the commercialization of fuel cell vehicles operating on hydrogen fuel. In order to be used extensively in the transportation sector, the safety of hydrogen production, storage, and supply needs to be addressed.

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A multinational energy company wanted to complete an evaluation of a PRV system in order to comply with the PSM standard OSHA 29 CFR 1910.119 which requires that employers compile information pertaining to the equipment in the process, including relief system design and design basis. 
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Featured Resources

Mechanical Integrity Considerations in LNG Depressurization

In a typical LNG installation, a rapid depressurization can cause cryogenic temperatures in both upstream and downstream connected process equipment and piping. This phenomenon, sometimes referred to as auto-refrigeration, can compromise the equipment’s mechanical integrity and pose a risk of material embrittlement. As vessel metal walls are exposed to temperatures below the minimum design metal temperature (MDMT), permanent damage is possible. The potential for brittle failure is even more pronounced for a non-fire scenario. The level of severity depends on the initial pressure, initial temperature, content inventory, depressurizing rate, fluid composition, surrounding conditions, and heat transfer mechanisms.

Emergency depressurizing valves must therefore be sized to ensure a reasonable compromise between the impact of pressure and temperature. This paper examines the effects of different liquid levels, depressurizing valve sizes, vessel wall thicknesses, thermal insulations, and fluid compositions. The primary objective is to identify and illustrate the key factors that influence the mechanical integrity of a typical LNG installation, particularly at the mid to lower end of methane fluid compositions, and their impacts on carbon steel.


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