Explosion-Proof Cameras on FPSOs and Offshore Vessels: ATEX Zone 1 and SOLAS Requirements

The FPSO and Offshore Vessel Camera Challenge

Floating Production, Storage, and Offloading vessels (FPSOs), Floating Storage and Offloading units (FSOs), and offshore support vessels present a convergence of the most demanding explosion-proof camera requirements found anywhere in industry. They combine hazardous-area classification (ATEX Zone 1 around topsides processing equipment), the marine corrosion environment of constant saltwater spray, the dynamic structural loads of a floating platform, international regulatory frameworks (IMO, SOLAS, Flag State requirements), and the operational reality of remote locations where maintenance resources are extremely limited.

This guide covers the specification requirements that differentiate offshore vessel explosion-proof camera installations from onshore industrial applications.

FPSO Hazardous Area Classification

FPSOs produce and process crude oil and natural gas at sea. The topsides areas are classified using the IEC 60079-10-1 (gas) and IP 15 / EI 15 (Energy Institute) models, which result in Zone designations:

• Zone 0: Interior of process vessels, pipe interiors where flammable concentrations are continuously present. No cameras installed here.
• Zone 1: Around flanged connections, pump seals, valve glands, and open-top separators — flammable atmosphere likely under normal operations. Requires Ex d (explosion-proof) or Ex e (increased safety) cameras. Most cameras on FPSO topsides fall in Zone 1.
• Zone 2: Peripheral areas around Zone 1 — flammable atmosphere possible but unlikely during normal operations. Cameras here may be Ex d or Ex nA (non-arcing) or Ex e equipment.
• Non-hazardous areas: Accommodation modules, control rooms, engine rooms below a certain deck level. Standard commercial cameras acceptable.

FPSO operators typically specify Ex d IIB T4 Gb cameras (Group IIB = propane/ethylene, T4 = 135°C max surface temp) for Zone 1 topsides locations, which covers most crude oil and associated gas compositions.

ATEX and IECEx Certification for Marine Applications

ATEX (EU Directive 2014/34/EU) and IECEx (IEC 60079 series) certifications are both recognized by major FPSO operators and classification societies (DNV, Lloyd’s Register, Bureau Veritas, ABS). For international FPSO projects:

• IECEx is preferred over ATEX for non-EU flag state vessels — it is recognized globally without requiring EU market compliance. Many FPSO EPC contractors specify IECEx as the primary certification.
• ATEX is required for EU-flagged vessels and European Continental Shelf installations (North Sea, Mediterranean).
• Dual ATEX/IECEx: Most quality manufacturers obtain both certifications simultaneously — verify both certificate numbers when sourcing for international projects.

The IECEx Ex d certificate must reference IEC 60079-1 (explosion-proof enclosures) and specify the gas group (IIA, IIB, or IIC) and temperature class. Verify the certificate covers the specific gas composition on your FPSO — sour crude with H2S may require Group IIC (hydrogen equivalent) certification for some applications.

Marine Environmental Requirements

Corrosion Protection

Standard aluminum explosion-proof camera enclosures corrode rapidly in the marine environment. For FPSO and offshore vessel applications:

• 316L stainless steel: Standard specification for all Zone 1 cameras on FPSO topsides and open-deck areas. Resists chloride-induced pitting corrosion in continuous saltwater spray environments. Verify stainless steel construction is to L-grade (low carbon) to prevent sensitization from welding heat.
• Duplex stainless steel (2205): Used in highly corrosive applications (seawater splash zone, sour service) — higher chromium content provides superior resistance.
• Epoxy-coated aluminum: Acceptable for sheltered locations (under modules) where direct seawater spray is unlikely. Less expensive than stainless steel but requires regular coating inspection.

IP Rating

FPSO cameras must be rated at minimum IP66 (dust-tight, protection against powerful water jets). Cameras on exposed deck locations should be IP67 or IP68, protecting against temporary or continuous immersion — wave wash-over is a real exposure on lower FPSO decks.

Vibration and Shock

FPSOs experience continuous low-frequency vibration from processing equipment (compressors, pumps, gas turbines) and wave-induced hull motions. Cameras should be tested to IEC 60068-2-6 (vibration) and IEC 60068-2-27 (shock) at levels appropriate for offshore machinery environments. Verify mounting hardware maintains torque and prevents loosening under vibration — use Nord-Lock or equivalent anti-vibration fasteners.

IMO SOLAS Fire Safety Integration

IMO SOLAS Chapter II-2 (Fire Protection, Detection, and Extinction) governs fire safety on vessels. For FPSOs operating under SOLAS:

• Thermal cameras are recognized as area fire detectors when integrated with the vessel’s fire and gas (F&G) detection system under SOLAS II-2/7 (MSC/Circ.1400).
• Classification society approval (DNV, LR, BV) is required for thermal cameras integrated into the F&G system — this is a separate approval from the ATEX/IECEx explosive atmosphere certification.
• Optical cameras for security and operations monitoring fall under ISPS Code (International Ship and Port Facility Security Code) requirements for vessel access monitoring.

Specify cameras with both ATEX/IECEx certification (for installation in classified zones) AND classification society type approval (for integration with SOLAS safety systems) when cameras serve both purposes.

Remote Monitoring via Satellite and VSAT

FPSOs in deepwater locations (offshore West Africa, Brazil pre-salt, Gulf of Mexico deep water) are connected to shore operations by satellite. Bandwidth constraints affect camera system design:

• Local NVR recording: All video is recorded locally onboard. The satellite link transmits only alarm clips, VMS metadata, and operator-requested live feeds — not continuous streaming.
• Bandwidth allocation: Typical FPSO VSAT budgets allocate 1–5 Mbps for surveillance data (all cameras combined) on a shared satellite circuit. H.265 compression and intelligent keyframe management are essential to fit meaningful video quality within this budget.
• Edge analytics: On-camera analytics (perimeter violation, loitering, thermal alarm) generate only alarm events rather than continuous streams, dramatically reducing satellite bandwidth consumption.
• Latency tolerance: Satellite latency (500–700 ms round-trip) affects PTZ operator control. PTZ cameras on FPSOs should have stored pan-patrol presets for routine monitoring, with manual control reserved for incident investigation when latency is acceptable.

Maintenance in Remote Offshore Environments

Offshore camera maintenance must account for the limited technician resources and part availability on FPSOs:

• Specify cameras with Mean Time Between Failure (MTBF) exceeding 50,000 hours — failures on FPSOs may go unrepaired for months awaiting parts delivery
• Maintain onboard spares package: minimum two cameras per installed model, lens cover glass kits, gasket sets, and PoE injectors
• Design for toolless lens cleaning — operators should be able to clean lens covers without opening the explosion-proof enclosure
• Remote health monitoring via SNMP or VMS agent — identify cameras that have failed or degraded before on-site maintenance visits

Frequently Asked Questions

Does a camera certified ATEX Ex d IIB T4 cover all FPSO hazardous area requirements?

For most crude oil and associated gas FPSOs, yes — Group IIB covers propane and ethylene, and T4 covers most petroleum gas mixtures. However, FPSOs processing sour gas with high H2S content may require Group IIC (covers hydrogen, the most ignition-sensitive class). Check the specific gas composition with your process safety engineer before finalizing the specification.

What is the difference between ATEX certification and DNV/Class approval for cameras?

ATEX certification confirms the camera is safe for installation in explosive atmospheres (the hazardous area certification). DNV/Class type approval confirms the camera meets marine environmental performance standards (vibration, shock, temperature, humidity, EMC) suitable for vessel installation. For cameras integrated into SOLAS safety systems, both certifications are required — they cover different aspects of the product.

Can I use IP cameras connected to a satellite NVR system without a local NVR onboard?

No — satellite bandwidth cannot support continuous video streaming from more than a few cameras simultaneously. A local onboard NVR is essential for all-camera continuous recording. The satellite link provides remote operator access to live feeds and alarms, and transfers alarm-triggered clips to shore for investigation, but does not replace onboard recording.

Standards References: IECEx International Certification Scheme · OSHA Hazardous Work Environments

Explore Veilux’s full range of explosion-proof cameras and request a quote for your hazardous-area project.

Related Resources

• Browse Explosion-Proof Cameras for Hazardous Locations
• Explosion-Proof Cameras for Offshore Platforms
• Explosion-Proof Cameras for Oil and Gas Refineries
• ATEX Zone 0, Zone 1, Zone 2 Camera Selection Guide
• Request a Project Quote

About the Author

Daniel Fernandez

Daniel Fernandez is a hazardous area security systems specialist with over a decade of experience specifying ATEX, IECEx, UL Class I Division 1, and cUL certified surveillance equipment for oil and gas, chemical, mining, pharmaceutical, and offshore environments. He holds expertise in NEC and IEC area classification standards and has consulted on explosion-proof camera system designs across North America, Europe, and the Middle East.