Specifying offshore accommodation containers for oil and gas platforms, drilling rigs and marine vessels is significantly more complex than specifying onshore workforce housing. Offshore operators impose strict welfare, structural and certification requirements that go well beyond standard container specifications. This guide covers what operators require and what procurement teams need to specify to meet those requirements.
Why Offshore Accommodation Containers Are Different
Onshore accommodation containers must be comfortable and functional. Offshore accommodation containers must also be:
- Structurally certified for crane lifting in marine environments
- Compliant with offshore safety and escape requirements
- Resistant to saltwater corrosion over extended operational periods
- Capable of maintaining interior comfort in extreme ambient conditions
- Compliant with offshore welfare standards — which are significantly more demanding than onshore equivalents
Structural and Certification Requirements
DNV 2.7-1 Certification
Any accommodation container that will be crane-lifted onto an offshore platform or vessel must be DNV 2.7-1 certified. This certifies the structural frame, lifting points and corner fittings for dynamic offshore crane loads. Non-certified units will be refused at the quayside by all major oil and gas operators.
Corrosion Protection
Offshore environments impose severe corrosion demands. Specify minimum C5-M corrosion protection category (ISO 12944) for all external steel surfaces. This includes:
- Surface preparation to Sa 2.5 standard
- High-build epoxy primer
- Polyurethane topcoat
- Minimum dry film thickness: 320 microns total
Fire and Explosion Protection
Offshore accommodation containers on or near process areas must meet fire resistance requirements. Specify the appropriate fire rating:
- A-0 — standard fire-resistant bulkhead, 0-minute integrity
- A-60 — 60-minute fire integrity, required for accommodation adjacent to process areas
- Blast-resistant — for installations within the blast zone of process equipment
Welfare Standards for Offshore Accommodation
Major oil and gas operators follow international offshore welfare standards that define minimum requirements for personnel accommodation. Key requirements include:
Sleeping Quarters
- Minimum floor area per person: typically 4.5 m² for single occupancy, 3.0 m² per person for twin occupancy
- Individual bunk with privacy curtain for shared cabins
- Personal storage — minimum one wardrobe and one drawer unit per person
- Individual reading light and power outlet at each bunk
- Blackout blinds and noise insulation to minimum 35 dB reduction
Sanitation Facilities
- Maximum 8 persons per shower and per toilet
- Hot water supply — minimum 60°C storage temperature
- Separate male and female facilities where mixed gender workforce
- Greywater and blackwater management compliant with MARPOL regulations for marine installations
Thermal Comfort
- Interior temperature maintained at 18°C to 26°C regardless of ambient conditions
- Minimum air changes: 6 per hour for sleeping areas, 10 per hour for sanitation areas
- Individual temperature control in sleeping cabins where possible
Insulation Specifications for Offshore Accommodation
Sandwich panel construction is the standard for offshore accommodation containers — combining structural steel outer skins with insulated core panels. Key insulation specifications:
- Mineral wool core — non-combustible, meets offshore fire resistance requirements
- PIR (Polyisocyanurate) core — higher thermal performance, suitable for extreme climate applications
- Minimum wall U-value: 0.35 W/m²K for temperate climates, 0.20 W/m²K for arctic applications
- Acoustic performance: minimum 35 dB Rw for sleeping cabin partitions
HVAC Specifications
- Cooling capacity: sized for maximum anticipated occupancy at peak ambient temperature
- Heating capacity: sized for minimum ambient temperature with full occupancy
- Air filtration: minimum G4 pre-filter and F7 fine filter for offshore environments
- ATEX certified HVAC equipment for installations in or adjacent to hazardous areas
Tamga Modules Offshore Accommodation Container Solutions
Tamga Modules designs and manufactures offshore life support and accommodation containers to DNV 2.7-1, A-60 fire resistance and major operator welfare standards. Our units are supplied with full certification documentation and C5-M corrosion protection as standard.
We also supply complete oil field camp container solutions and prefabricated modular buildings for onshore workforce accommodation.