The likelihood of occurrence of an event or an event sequence during an interval of time. Probability is expressed as a dimensionless number ranging from 0 to 1. Acronyms & Terms Glossary <- More Definitions Probability The likelihood of occurrence of an event or an event sequence during an interval of time. Probability is expressed as a dimensionless number ranging from 0 to 1. Our Services Whitepaper: The Courage to Intervene | Developing Ethical Leadership in the Next Generation of Process Safety Professionals As the process industries experience the “great shift change,” developing the next generation of leaders requires more than technical competence. It demands ethical courage and the ability to influence others to uphold process safety under pressure. This paper explores how ethical decision-making and leadership behaviors can be intentionally developed through structured case-based learning derived from real engineering failures. aeSolutions Recognized with 2026 CSIA Social Responsibility Award aeSolutions is proud to share that we were recognized with the 2026 Social Responsibility Award at the 2026 CSIA Awards, held during the Control System Integrators Association Conference in Baltimore, Maryland. Whitepaper: Six Feet Under | How to Dig Yourself Out of a Recommendations Graveyard Have you felt buried under six feet of safety study recommendations that must be closed? Does it feel impossible to follow Recognized and Generally Accepted Good Engineering Practices (RAGAGEPs) to convert recommendations into engineered design reality? You are not alone.

Testing and Turnover Site Acceptance Testing and Startup Testing and Turnover After the control system and I/O have been installed and commissioned, aeSolutions works with the client to deliver Site Acceptance Testing in accordance with aeSolutions' generated SAT plan. SAT is similar to the FAT but includes testing of actual field devices and foreign device interfaces. Site Acceptance Testing proves that the supplied system, including the control logic and operator stations, is interfaced to the field I/O correctly and performs in accordance with the project specifications. aeSolutions offers startup support after the client has accepted the system. • Approved SAT test plan • SAT test results and punch list disposition • Startup assistance support Automation Services Previous Next

A function of the expected frequency and severity of a single potential incident or group of incidents. Acronyms & Terms Glossary <- More Definitions Risk A function of the expected frequency and severity of a single potential incident or group of incidents. Our Services Whitepaper: The Courage to Intervene | Developing Ethical Leadership in the Next Generation of Process Safety Professionals As the process industries experience the “great shift change,” developing the next generation of leaders requires more than technical competence. It demands ethical courage and the ability to influence others to uphold process safety under pressure. This paper explores how ethical decision-making and leadership behaviors can be intentionally developed through structured case-based learning derived from real engineering failures. aeSolutions Recognized with 2026 CSIA Social Responsibility Award aeSolutions is proud to share that we were recognized with the 2026 Social Responsibility Award at the 2026 CSIA Awards, held during the Control System Integrators Association Conference in Baltimore, Maryland. Whitepaper: Six Feet Under | How to Dig Yourself Out of a Recommendations Graveyard Have you felt buried under six feet of safety study recommendations that must be closed? Does it feel impossible to follow Recognized and Generally Accepted Good Engineering Practices (RAGAGEPs) to convert recommendations into engineered design reality? You are not alone.

Layers of Protection Analysis (LOPA) is a semi quantitative method of risk assessment analyzing the frequency of occurrence of events that can produce a hazard associated with handling of hazardous chemicals. LOPA considers the applicability of safeguards, the potential for individual layers of protection to fail, and the potential consequences that are consistent with the organization's risk tolerance. During LOPA, Independent Protection Layers (IPLs) are identified. Claiming credit for one or more IPLs that do not provide the protection claimed will result in under-designed SIFs, increasing risk to the facility. Claiming less credit for IPLs than is actually provided will result in over-designed SIFs, increasing capital cost. aeSolutions has the expertise and experience to help you perform this critical task most effectively. Acronyms & Terms Glossary <- More Definitions Layers Of Protection Analysis (LOPA) Layers of Protection Analysis (LOPA) is a semi quantitative method of risk assessment analyzing the frequency of occurrence of events that can produce a hazard associated with handling of hazardous chemicals. LOPA considers the applicability of safeguards, the potential for individual layers of protection to fail, and the potential consequences that are consistent with the organization's risk tolerance. During LOPA, Independent Protection Layers (IPLs) are identified. Claiming credit for one or more IPLs that do not provide the protection claimed will result in under-designed SIFs, increasing risk to the facility. Claiming less credit for IPLs than is actually provided will result in over-designed SIFs, increasing capital cost. aeSolutions has the expertise and experience to help you perform this critical task most effectively. Our Services Whitepaper: The Courage to Intervene | Developing Ethical Leadership in the Next Generation of Process Safety Professionals As the process industries experience the “great shift change,” developing the next generation of leaders requires more than technical competence. It demands ethical courage and the ability to influence others to uphold process safety under pressure. This paper explores how ethical decision-making and leadership behaviors can be intentionally developed through structured case-based learning derived from real engineering failures. aeSolutions Recognized with 2026 CSIA Social Responsibility Award aeSolutions is proud to share that we were recognized with the 2026 Social Responsibility Award at the 2026 CSIA Awards, held during the Control System Integrators Association Conference in Baltimore, Maryland. Whitepaper: Six Feet Under | How to Dig Yourself Out of a Recommendations Graveyard Have you felt buried under six feet of safety study recommendations that must be closed? Does it feel impossible to follow Recognized and Generally Accepted Good Engineering Practices (RAGAGEPs) to convert recommendations into engineered design reality? You are not alone.

Layers of Protection Analysis (LOPA) is a semi quantitative method of risk assessment analyzing the frequency of occurrence of events that can produce a hazard associated with handling of hazardous chemicals. To ensure safety, a LOPA considers the applicability of safeguards, the potential for individual layers of protection to fail, and the potential consequences that are consistent with the organization's risk tolerance Acronyms & Terms Glossary <- More Definitions What is LOPA in safety Layers of Protection Analysis (LOPA) is a semi quantitative method of risk assessment analyzing the frequency of occurrence of events that can produce a hazard associated with handling of hazardous chemicals. To ensure safety, a LOPA considers the applicability of safeguards, the potential for individual layers of protection to fail, and the potential consequences that are consistent with the organization's risk tolerance Our Services Whitepaper: The Courage to Intervene | Developing Ethical Leadership in the Next Generation of Process Safety Professionals As the process industries experience the “great shift change,” developing the next generation of leaders requires more than technical competence. It demands ethical courage and the ability to influence others to uphold process safety under pressure. This paper explores how ethical decision-making and leadership behaviors can be intentionally developed through structured case-based learning derived from real engineering failures. aeSolutions Recognized with 2026 CSIA Social Responsibility Award aeSolutions is proud to share that we were recognized with the 2026 Social Responsibility Award at the 2026 CSIA Awards, held during the Control System Integrators Association Conference in Baltimore, Maryland. Whitepaper: Six Feet Under | How to Dig Yourself Out of a Recommendations Graveyard Have you felt buried under six feet of safety study recommendations that must be closed? Does it feel impossible to follow Recognized and Generally Accepted Good Engineering Practices (RAGAGEPs) to convert recommendations into engineered design reality? You are not alone.

An audible and/or visible means of indicating to the operator an equipment malfunction, process deviation, or abnormal condition requiring a response. aeSolutions can supply expertise at all stages of alarm management including consulting, training, and facilitating rationalization teams, followed by full design and implementation services. Acronyms & Terms Glossary <- More Definitions Alarm An audible and/or visible means of indicating to the operator an equipment malfunction, process deviation, or abnormal condition requiring a response. aeSolutions can supply expertise at all stages of alarm management including consulting, training, and facilitating rationalization teams, followed by full design and implementation services. Our Services Whitepaper: The Courage to Intervene | Developing Ethical Leadership in the Next Generation of Process Safety Professionals As the process industries experience the “great shift change,” developing the next generation of leaders requires more than technical competence. It demands ethical courage and the ability to influence others to uphold process safety under pressure. This paper explores how ethical decision-making and leadership behaviors can be intentionally developed through structured case-based learning derived from real engineering failures. aeSolutions Recognized with 2026 CSIA Social Responsibility Award aeSolutions is proud to share that we were recognized with the 2026 Social Responsibility Award at the 2026 CSIA Awards, held during the Control System Integrators Association Conference in Baltimore, Maryland. Whitepaper: Six Feet Under | How to Dig Yourself Out of a Recommendations Graveyard Have you felt buried under six feet of safety study recommendations that must be closed? Does it feel impossible to follow Recognized and Generally Accepted Good Engineering Practices (RAGAGEPs) to convert recommendations into engineered design reality? You are not alone.

A hypothetical explosion, fire, or toxic event that has the potential maximum consequence to the occupants of the building under consideration from among the major scenarios evaluated. The major scenarios are realistic and have a reasonable probability of occurrence considering the chemicals, inventories, equipment and piping design, operating conditions, fuel reactivity, process unit geometry, industry incident history, and other factors. Each building may have its own set of MCEs for potential explosion, fire, or toxic material release impacts. Maximum Credible Events (MCEs) are considered during facility siting studies conducted by aeSolutions' experienced modelers. to help companies identify the flammable and/or toxic consequences and impacts to receptors due to a chemical release. Acronyms & Terms Glossary <- More Definitions Maximum Credible Event (MCE) A hypothetical explosion, fire, or toxic event that has the potential maximum consequence to the occupants of the building under consideration from among the major scenarios evaluated. The major scenarios are realistic and have a reasonable probability of occurrence considering the chemicals, inventories, equipment and piping design, operating conditions, fuel reactivity, process unit geometry, industry incident history, and other factors. Each building may have its own set of MCEs for potential explosion, fire, or toxic material release impacts. Maximum Credible Events (MCEs) are considered during facility siting studies conducted by aeSolutions' experienced modelers. to help companies identify the flammable and/or toxic consequences and impacts to receptors due to a chemical release. Our Services Whitepaper: The Courage to Intervene | Developing Ethical Leadership in the Next Generation of Process Safety Professionals As the process industries experience the “great shift change,” developing the next generation of leaders requires more than technical competence. It demands ethical courage and the ability to influence others to uphold process safety under pressure. This paper explores how ethical decision-making and leadership behaviors can be intentionally developed through structured case-based learning derived from real engineering failures. aeSolutions Recognized with 2026 CSIA Social Responsibility Award aeSolutions is proud to share that we were recognized with the 2026 Social Responsibility Award at the 2026 CSIA Awards, held during the Control System Integrators Association Conference in Baltimore, Maryland. Whitepaper: Six Feet Under | How to Dig Yourself Out of a Recommendations Graveyard Have you felt buried under six feet of safety study recommendations that must be closed? Does it feel impossible to follow Recognized and Generally Accepted Good Engineering Practices (RAGAGEPs) to convert recommendations into engineered design reality? You are not alone.

Note: ISA 84 was a previous edition of the standard. Please see ANSI ISA-16511 (IEC 61511) ANSI/ISA-16511 (IEC 61511) is an industry standard for best practices related to safety instrumented systems (SIS), Covering over the activities involved in the design, operation and maintenance of instrumented systems, from sensor through final element, used to achieve functional safety in the process industries. Acronyms & Terms Glossary <- More Definitions IEC 61511 - ISA 84 Note: ISA 84 was a previous edition of the standard. Please see ANSI ISA-16511 (IEC 61511) ANSI/ISA-16511 (IEC 61511) is an industry standard for best practices related to safety instrumented systems (SIS), Covering over the activities involved in the design, operation and maintenance of instrumented systems, from sensor through final element, used to achieve functional safety in the process industries. Our Services Whitepaper: The Courage to Intervene | Developing Ethical Leadership in the Next Generation of Process Safety Professionals As the process industries experience the “great shift change,” developing the next generation of leaders requires more than technical competence. It demands ethical courage and the ability to influence others to uphold process safety under pressure. This paper explores how ethical decision-making and leadership behaviors can be intentionally developed through structured case-based learning derived from real engineering failures. aeSolutions Recognized with 2026 CSIA Social Responsibility Award aeSolutions is proud to share that we were recognized with the 2026 Social Responsibility Award at the 2026 CSIA Awards, held during the Control System Integrators Association Conference in Baltimore, Maryland. Whitepaper: Six Feet Under | How to Dig Yourself Out of a Recommendations Graveyard Have you felt buried under six feet of safety study recommendations that must be closed? Does it feel impossible to follow Recognized and Generally Accepted Good Engineering Practices (RAGAGEPs) to convert recommendations into engineered design reality? You are not alone.

QRA stands for quantitative risk analysis, a technique for assessing the risk of prospective asset risks. Acronyms & Terms Glossary <- More Definitions What is QRA in safety QRA stands for quantitative risk analysis, a technique for assessing the risk of prospective asset risks. Our Services Whitepaper: The Courage to Intervene | Developing Ethical Leadership in the Next Generation of Process Safety Professionals As the process industries experience the “great shift change,” developing the next generation of leaders requires more than technical competence. It demands ethical courage and the ability to influence others to uphold process safety under pressure. This paper explores how ethical decision-making and leadership behaviors can be intentionally developed through structured case-based learning derived from real engineering failures. aeSolutions Recognized with 2026 CSIA Social Responsibility Award aeSolutions is proud to share that we were recognized with the 2026 Social Responsibility Award at the 2026 CSIA Awards, held during the Control System Integrators Association Conference in Baltimore, Maryland. Whitepaper: Six Feet Under | How to Dig Yourself Out of a Recommendations Graveyard Have you felt buried under six feet of safety study recommendations that must be closed? Does it feel impossible to follow Recognized and Generally Accepted Good Engineering Practices (RAGAGEPs) to convert recommendations into engineered design reality? You are not alone.

Looking Ahead Lifecycle and Upgrade Planning Looking Ahead aeSolutions can provide the client with strategies, alternatives, and estimates for upgrades and migrations of safety and control systems. • Current state versus obsolescence • Software upgrades • Hardware upgrades • Platform and vendor migrations • Integration opportunities • Safety and Control System harmonizing • Expansions Automation Services Previous Next

A process to examine the key elements that qualifies a safeguard as an IPL: Independence, Dependability, Specificity, Auditability, Security, and Field Verification. Acronyms & Terms Glossary <- More Definitions IPL Verification A process to examine the key elements that qualifies a safeguard as an IPL: Independence, Dependability, Specificity, Auditability, Security, and Field Verification. Our Services Whitepaper: The Courage to Intervene | Developing Ethical Leadership in the Next Generation of Process Safety Professionals As the process industries experience the “great shift change,” developing the next generation of leaders requires more than technical competence. It demands ethical courage and the ability to influence others to uphold process safety under pressure. This paper explores how ethical decision-making and leadership behaviors can be intentionally developed through structured case-based learning derived from real engineering failures. aeSolutions Recognized with 2026 CSIA Social Responsibility Award aeSolutions is proud to share that we were recognized with the 2026 Social Responsibility Award at the 2026 CSIA Awards, held during the Control System Integrators Association Conference in Baltimore, Maryland. Whitepaper: Six Feet Under | How to Dig Yourself Out of a Recommendations Graveyard Have you felt buried under six feet of safety study recommendations that must be closed? Does it feel impossible to follow Recognized and Generally Accepted Good Engineering Practices (RAGAGEPs) to convert recommendations into engineered design reality? You are not alone.

Zero-Energy State (ZES) refers to a condition where all energy sources to a system or equipment have been isolated, and stored energy has been dissipated. ZES is essential for ensuring the safety of personnel during maintenance or repair activities. Acronyms & Terms Glossary <- More Definitions Zero-Energy State (ZES) Zero-Energy State (ZES) refers to a condition where all energy sources to a system or equipment have been isolated, and stored energy has been dissipated. ZES is essential for ensuring the safety of personnel during maintenance or repair activities. Our Services Whitepaper: The Courage to Intervene | Developing Ethical Leadership in the Next Generation of Process Safety Professionals As the process industries experience the “great shift change,” developing the next generation of leaders requires more than technical competence. It demands ethical courage and the ability to influence others to uphold process safety under pressure. This paper explores how ethical decision-making and leadership behaviors can be intentionally developed through structured case-based learning derived from real engineering failures. aeSolutions Recognized with 2026 CSIA Social Responsibility Award aeSolutions is proud to share that we were recognized with the 2026 Social Responsibility Award at the 2026 CSIA Awards, held during the Control System Integrators Association Conference in Baltimore, Maryland. Whitepaper: Six Feet Under | How to Dig Yourself Out of a Recommendations Graveyard Have you felt buried under six feet of safety study recommendations that must be closed? Does it feel impossible to follow Recognized and Generally Accepted Good Engineering Practices (RAGAGEPs) to convert recommendations into engineered design reality? You are not alone.