Oil & Gas
The most demanding industry for functional safety, explosion protection and OT cybersecurity. From wellhead to terminal, every unit combines high-hazard continuous process, explosive atmospheres and critical infrastructure. Applicable standards, key technologies, major players and the accidents that shaped the discipline.
The value chain
Upstream — exploration & production
Drilling, wellheads, separation, offshore platforms and onshore facilities. Blowout preventer (BOP), flaring, fiscal metering.
Midstream — transport & storage
Pipelines, compression and pumping stations, LNG terminals, tank farms. Long-distance SCADA, leak detection.
Downstream — refining & petrochemicals
Distillation, cracking, reforming, petrochemical units. High instrumentation density, DCS and safety instrumented systems.
Key challenges
- Process safety — high pressures, flammable and toxic products, explosion scenarios. Safety instrumented systems are everywhere, sized in SIL.
- ATEX / Ex — almost every area is zone-classified. Every device must carry an Ex marking consistent with its zone.
- Cybersécurité OT — critical infrastructure under NIS2; the SIS itself has become a target (Triton).
- Environment & availability — flaring, emissions, leak detection; unplanned shutdowns are extremely costly.
Key technologies
Standards & references
Beyond the standards below, the sector relies on its own references: API RP 14C and 754 (facility safety and indicators), NORSOK (Norwegian North Sea), and NAMUR recommendations for process instrumentation.
- IEC 61511 — Functional safety for process (SIS)
- IEC 61508 — Base functional safety standard
- IEC 62443 — Industrial cybersecurity
- ATEX Directive 2014/34/EU — Ex equipment
- IEC 60079-0 — Explosive atmospheres, general
- IECEx — International Ex certification
- ISA-95 — Enterprise / control integration
- NAMUR NE 43 — 4-20 mA fault signalling
Major players
Operators
ExxonMobil, Shell, TotalEnergies, BP, Chevron, Saudi Aramco, ADNOC, Equinor.
Engineering & EPC
Technip Energies, Bechtel, Worley, Saipem, McDermott, Wood.
Automation & DCS
Emerson DeltaV, Honeywell Experion, Yokogawa CENTUM, ABB 800xA, Siemens PCS 7, Schneider Foxboro.
Safety systems
HIMA, Schneider Triconex, Honeywell Safety Manager, Yokogawa ProSafe-RS, Siemens S7 F.
Landmark accidents
The discipline of industrial safety was built on these disasters. Each one changed a standard or a practice.
| Event | Year | Location | Lesson |
|---|---|---|---|
| Piper Alpha | 1988 | North Sea | 167 deaths. Gave rise to the "Safety Case" regime and to permit-to-work culture. |
| Texas City | 2005 | BP refinery, USA | 15 deaths. Overfill of an isomerization tower; failed instrumentation and alarms. |
| Buncefield | 2005 | Storage depot, UK | Tank overfill: stuck gauge + inoperative high-level switch. Textbook case of an unmaintained safety function. |
| Deepwater Horizon | 2010 | Gulf of Mexico | 11 deaths, major oil spill. Failure of the BOP and of well barrier management. |
| Triton / Trisis | 2017 | Petrochemical, Saudi Arabia | First cyberattack targeting a safety instrumented system to disable its protections. Safety / cyber convergence. |