Engineering-led functional safety consulting in the US, aligned to IEC 61511, ANSI/ISA 84, and ISO 26262.
Arista Cyber provides functional safety consulting services in the US that help industrial operators keep their safety-critical systems reliable, compliant, and audit-ready. As a functional safety company serving American oil and gas, chemical, energy, and manufacturing operations, we deliver industrial functional safety engineering services across the entire safety lifecycle, from hazard identification through safety integrity level determination, verification, and validation. Our functional safety consultants work to the requirements of IEC 61511, IEC 61508, ANSI/ISA 84, and ISO 26262, so your safety instrumented systems deliver the risk reduction they were designed for and support your obligations under OSHA Process Safety Management. Uniquely, we integrate functional safety with OT cybersecurity, because in a modern plant a cyberattack on a safety system is itself a functional safety risk.
Arista Cyber delivers functional safety services that keep safety-critical industrial systems reliable, compliant, and protected across the entire safety lifecycle. From hazard identification to safety validation, our certified functional safety consultants help US operators reduce risk, meet functional safety standards, satisfy OSHA and EPA process safety expectations, and prove their systems perform when it matters most. Whether you need a single safety integrity level assessment or a complete functional safety management service, we work directly with your team on site and remotely across the United States.
Functional safety is the part of overall system safety that depends on protective systems operating correctly in response to their inputs. In industrial environments, it is what ensures a safety instrumented system, interlock, or emergency shutdown responds the way it should when a hazardous condition occurs, protecting people, equipment, and production.
Achieving it is not a one-time task. Industrial functional safety spans the full lifecycle of a safety system, from initial hazard analysis and functional safety requirements through design, implementation, validation, and ongoing management. Arista Cyber provides functional safety engineering services across every one of those stages for US operators, aligned to recognized functional safety standards including IEC 61511 and its US adoption ANSI/ISA 84 for the process industries, IEC 61508 as the foundational standard, and ISO 26262 for automotive systems.
Systematic hazard and operability studies that identify risks and design safeguards, forming the foundation of your functional safety assessment and PSM program.
Safety integrity level assessment that evaluates the exact level of risk reduction each safety function requires under IEC 61511 and ANSI/ISA 84.
Detailed functional safety requirements documentation that defines clear, testable safety goals for every safety-critical system.
Validation and verification that confirms safety instrumented systems meet both regulatory functional safety standards and real operational requirements.
A complete functional safety management service that tracks and governs the safety lifecycle of your systems, with audit-ready documentation.
Reliability, availability, maintainability, and safety analysis that optimizes system performance across all four dimensions.
A structured series of functional safety assessments and audits across the lifecycle to evaluate safety performance and close gaps.
Proof test procedures that validate safety system functionality under real operating conditions.
A cyberattack on a safety instrumented system is itself a functional safety failure. Most US providers treat functional safety engineering and OT cybersecurity as separate disciplines, and the gap between them becomes the exposure. Arista Cyber is a functional safety company that integrates both, aligning IEC 61511 with ISA/IEC 62443 so your safety systems are protected against random failure and deliberate attack alike. You can read more about our OT cybersecurity services and how they reinforce functional safety for US operators.
For American operators in oil and gas, chemicals, and power, this integrated approach closes a gap that safety-only and security-only providers leave open, and it aligns with the direction both the functional safety and cybersecurity standards communities are now taking.
Functional safety is not a single task; it is a lifecycle. Each of our services maps to a specific stage of the IEC 61511 and ANSI/ISA 84 safety lifecycle, so your safety systems are covered from initial hazard analysis through operation and modification.
| Lifecycle stage | What happens | Arista Cyber service |
|---|---|---|
| 1. Hazard & Risk Assessment | Identify hazards and assess process risk | HAZOP / HAZID Studies |
| 2. SIL Determination | Assign target safety integrity levels to each safety function | SIL Assessment & Determination |
| 3. Safety Requirements | Define what each safety function must do | Safety Requirement Specification |
| 4. Design & Verification | Confirm the SIS design meets the target SIL | SIL Verification, Proof Test Procedures |
| 5. Validation | Prove the installed system performs as specified | Safety Validation & Verification |
| 6. Operation & Maintenance | Keep safety functions performing over time | RAMS Study, FSM Documentation |
| 7. Assessment & Modification | Audit performance and manage change | Functional Safety Assessments (FSA 1 to 5) |
Our functional safety assessments and supporting documentation align to the international standards and the US regulatory expectations that operators must satisfy:
The foundational functional safety standard for electrical, electronic, and programmable safety systems. Arista Cyber acts as an IEC 61508 specialist in the US.
Functional safety for the process industry sector and safety instrumented systems. ANSI/ISA 84 is the US adoption of IEC 61511, and we serve as an IEC 61511 specialist in the US for oil and gas, chemical, and energy operators.
Our HAZOP, SIL, and documentation work supports the process hazard analysis and mechanical integrity elements of PSM under 29 CFR 1910.119.
Functional safety work that supports risk management planning for facilities handling regulated substances.
Functional safety for automotive electrical and electronic systems.
Applied where functional safety and OT cybersecurity intersect.
We provide industrial functional safety engineering services across every US sector where safety-critical processes carry real operational consequence: oil and gas, chemical and petrochemical, energy and utilities, manufacturing, pharmaceuticals, and automotive. Each sector carries its own risk profile, and our functional safety consultants tailor every engagement to the operating constraints, asset criticality, and regulatory expectations of the US environment.
Our team holds globally recognized functional safety certifications and applies a structured, standards-based methodology to every engagement, including TUV Rheinland or TUV SUD Functional Safety Engineer certification and CFSE or CFSP credentials.
We work directly with US operators on site and remotely across the country, so your HAZOP studies, safety integrity level assessments, and validation work are delivered by people who understand OSHA PSM, EPA RMP, and the US regulatory environment.
We support every stage of the safety lifecycle, from hazard analysis and risk assessment through functional safety implementation and ongoing management.
We combine functional safety and industrial cybersecurity in practice, uniting IEC 61511 and IEC 62443 for comprehensive protection of modern safety systems. This is an advantage safety-only and security-only firms cannot match.
Our assessments, requirements, and documentation are customized for your operations and designed to withstand OSHA, EPA, and internal audit scrutiny.
Whether you need a single SIL assessment or a complete functional safety management service, our team is ready to help.
→Book Your Free ConsultationYes. Arista Cyber provides functional safety consulting services in the US across oil and gas, chemical, energy and utilities, manufacturing, pharmaceuticals, and automotive. We work directly with US operators on site and remotely, delivering the full safety lifecycle from HAZOP through validation.
Yes. Our certified functional safety consultants deliver services aligned to IEC 61508 as the foundational standard and IEC 61511, adopted in the US as ANSI/ISA 84, for process industry safety instrumented systems, along with ISO 26262 for automotive and ISA/IEC 62443 where safety and cybersecurity intersect.
OSHA Process Safety Management requires process hazard analysis and the ongoing mechanical integrity of safety-critical systems. Our HAZOP studies, SIL assessments, and functional safety documentation directly support these PSM elements, giving you audit-ready evidence that your safety instrumented systems are specified, verified, and maintained correctly.
A safety integrity level assessment determines the level of risk reduction each safety function must deliver to bring risk to a tolerable level. Arista Cyber provides both SIL determination and SIL verification, so your safety instrumented systems are not only assigned a target but confirmed to meet it.
Our functional safety engineering services cover HAZOP and HAZID studies, SIL assessment and determination, safety requirement specification, safety validation and verification, RAMS studies, functional safety management service and documentation, functional safety assessments (FSA 1 to 5), and proof test procedures, all aligned to IEC 61511, IEC 61508, and ANSI/ISA 84.
Functional safety focuses on preventing systems from failing in ways that cause harm, such as safety instrumented systems, interlocks, and emergency shutdown systems. Cybersecurity focuses on preventing unauthorized access or attacks. Arista Cyber integrates both, since a cyberattack on a safety system is itself a functional safety risk. This is the core of how we approach IEC 62443 compliance.
