2026-09-21 · Équipe éditoriale KeXinMaterials

DNV-ST-0377 + DNV 2.7-1 + DNV 2.7-3 Famille conteneurs offshore Valise de protection Guide B2B

DNV (Det Norske Veritas) famille conteneurs offshore + unités offshore portables couvre DNV-ST-0377 (norme technique, Edition 2020), DNV 2.7-1 (norme de certification pour conteneurs offshore, Edition 2021) et DNV 2.7-3 (norme de certification pour unités offshore portables, Edition 2021). Requis pour valises de protection B2B transportant équipement vers plateformes offshore, plateformes de forage, FPSOs, OSVs et navires ravitailleurs. Ci-dessous guide d’achat B2B 2026 couvrant portée, exigences de conception, élingues, jeu d’élingues, marquage, inspection périodique et corrélation valise de protection.

Portée famille conteneurs offshore DNV

The DNV offshore standards family covers the design, manufacture, certification, marking, periodic inspection, and recertification of portable units used to transport equipment, supplies, and waste between shore base and offshore installations.

Scope: All portable units transported to offshore oil + gas installations, drilling rigs (jack-up, semi-submersible, drillship), FPSOs (Floating Production Storage and Offloading), OSVs (Offshore Support Vessels), AHTS (Anchor Handling Tug Supply), and accommodation platforms.

Geographic relevance: Worldwide, mandatory in Norwegian sector (NMA / Petroleumstilsynet), UK sector (HSE / OPRED), Brazil (ANP), Gulf of Mexico (BOEMRE / BSEE), Australia (NOPSEMA), West Africa, Southeast Asia offshore basins.

Family composition: DNV-ST-0377 (technical design standard) + DNV 2.7-1 (offshore containers) + DNV 2.7-3 (portable offshore units) + DNV 2.7-2 (lifting sets / slings for offshore containers) + DNV CG-0030 (DNV certification general guidance).

Complementary standards: EN 12079 (offshore containers, European), IMO MSC/Circ.860 (offshore containers, marine), API RP 2D (operation), ASME BTH-1 (below-the-hook lifting devices), CEN EN 13414-1 (steel wire rope slings).

B2B relevance: EU/Norwegian/US Gulf offshore-bound B2B orders of any equipment container require DNV 2.7-1 or 2.7-3 certification for acceptance on offshore platforms.

Non-DNV alternatives: Lloyd’s Register Type Approval, Bureau Veritas (BV) type approval, ABS Rules for portable offshore units, IACS Unified Requirements. DNV is the most widely recognized globally but all are accepted.

DNV-ST-0377 vs DNV 2.7-1: ST-0377 is the design standard (technical specification). 2.7-1 is the certification standard (how DNV certifies manufacturers / units). Both are required together for new units.

Phase-in dates (2026 status): DNV-ST-0377 current Edition October 2020. DNV 2.7-1 current Edition July 2021. DNV 2.7-3 current Edition July 2021. Periodic inspection every 5 years, or 2.5 years in some jurisdictions.

B2B recommendation: For 2026 offshore-bound B2B orders, require DNV-ST-0377 design compliance + DNV 2.7-1 or 2.7-3 certification + valid periodic inspection certificate + sling set certification (DNV 2.7-2).

DNV-ST-0377 Norme technique

DNV-ST-0377 (Edition October 2020) is the technical standard for offshore containers and portable offshore units. Specifies design loads, structural requirements, lifting, slinging, and verification testing.

DNV-ST-0377 issued by DNV AS, technical standards division. First issued 1993 as DNV 2.7-1 (combined design + certification). Split into ST-0377 (design) + 2.7-1 (certification) in 2014 to align with industry practice.

Design loads (DNV-ST-0377 Section 4): Vertical (1.2 x MGW gross mass weight), dynamic amplification factor (1.3 for sea state), environmental (wind, snow, wave impact for open-rig use), transportation (forklift pockets, truck tie-down).

Structural design: Carbon steel (S235 / S355 / S460 per EN 10025), aluminum (5083 / 6082 per EN 485), stainless (1.4401 / 1.4404 per EN 10088). Welds per EN ISO 5817 (quality level B or C depending on criticality).

Lifting requirements (Section 5): Single-point lift (top corner blocks) or 4-point lift (top + bottom corner castings). Sling angles provided at 60 degrees from horizontal (vertical lift) or 45-60 degrees (4-leg sling).

Forklift pockets: Standard ISO 5053-1, pocket spacing per DNV-ST-0377 Figure 5-1. Two pocket configurations: 205 mm wide x 100 mm high (standard) or 230 mm wide x 130 mm high (heavy).

Doors: Hinged doors (manual or hydraulic), rolling doors (for wider access), removable panels (for full side access). All with positive locking, secondary retention.

Drainage: Sloped floor (minimum 1:50) toward drain valve (1" or 1.5" ball valve). Drainage plug accessible from outside.

Static design verification: 1.2 x MGW vertical load test, dynamic amplification factor 1.3, lifting test (rated MGW + 25% margin), impact test (5 kJ at rated sling angle).

Fatigue design: For units subject to wave-zone or repeated offshore handling, fatigue analysis per DNV-ST-0377 Section 7, weld class as specified.

Inspection access: Manhole for enclosed units (per ISO 5211), pressure relief for closed units (per ASME BPVC Section VIII for pressurized), sight glass optional.

Material traceability: All structural steel with 3.1 certificates per EN 10204. Welding procedure qualification per EN ISO 3834-1 (quality level B or C).

B2B recommendation: For offshore-bound B2B orders, request DNV-ST-0377 design calculation package + welded fabrication records + material certificates.

DNV 2.7-1 Certification conteneurs offshore

DNV 2.7-1 (Edition July 2021) is the certification standard for offshore containers. Specifies manufacturer approval, unit certification, marking, periodic inspection, and recertification requirements.

DNV 2.7-1 scope: Certification of offshore containers for marine / offshore use. Excludes portable offshore units (covered by DNV 2.7-3) and freight containers (covered by ISO 1496-1).

Manufacturer Approval: DNV audits the manufacturer facility, welding procedures, quality system, and material traceability. Approval valid 4 years, then re-audit required.

Unit certification: Each container carries a DNV certification plate (riveted or welded), DNV Certificate of Compliance (CoC), design appraisal letter, and the manufacturer's plate with serial number.

Marking: All DNV-certified units marked with DNV certification mark, manufacturer symbol, year of manufacture, MGW (Maximum Gross Weight), TARE, serial number, and DNV stamp.

Design temperature range: Standard -20°C to +50°C. Arctic units -40°C to +50°C. Tropical units +60°C. Custom ranges per client requirement.

Periodic inspection: Visual inspection annually, full inspection (including NDT) every 5 years, or 2.5 years for units in active service. Inspection by DNV-certified inspector or third-party IACS member.

Recertification: After structural repair, modification, or 10-year recertification point, unit must be recertified by DNV. Inspection includes NDT (UT, MT, PT as applicable), dimensional check, lifting test.

Sling set certification (DNV 2.7-2): Sling sets (wire rope, chain, synthetic) for offshore lifting must be DNV 2.7-2 certified. Marked with SWL (Safe Working Load), serial number, manufacturer symbol, periodic inspection date.

Documentation package: Design report, structural drawing package, material certificates, welding records, NDT records, factory acceptance test (FAT) report, DNV Certificate of Compliance (CoC), manufacturer's plate photograph, marking photograph.

Non-DNV certification: Lloyd’s Register (LR) Type Approval, Bureau Veritas (BV) Type Approval, American Bureau of Shipping (ABS) Type Approval, all accepted by IACS-classed rigs / vessels.

B2B recommendation: For 2026 offshore orders, require DNV 2.7-1 Certificate of Compliance + valid periodic inspection (within 12 months) + DNV 2.7-2 sling set certification + manufacturer plate picture.

DNV 2.7-3 Unités offshore portables

DNV 2.7-3 (Edition July 2021) covers portable offshore units including workshops, laboratories, accommodation modules, power generation units, drilling fluid handling units, and similar modular units shipped to offshore installations.

DNV 2.7-3 scope: Portable offshore units (POUs) including but not limited to: mud skips, chemical skips, workshop containers, accommodation units, laboratory units, generator units, control rooms, switchgear rooms, mud pumps, choke manifold containers, waste skips.

Differentiation from 2.7-1: 2.7-1 covers simple storage / cargo / supply containers. 2.7-3 covers functional / operational units (workshops, gens, labs) with internal equipment, instrumentation, and process functions.

DNV 2.7-3 vs DNV-ST-E501: ST-E501 covers special offshore units (subsea equipment, wellhead, processing modules). 2.7-3 covers portable, transportable, non-permanently-installed units.

Design framework: Modular frame (per DNV-ST-0377), internal equipment installation per equipment vendor specs, integration testing (FAT / SIT), sea-fastening for offshore supply vessel transport, lifting certification.

Hazardous area classification: For units containing electrical equipment in hazardous areas (Zone 1 / Zone 2), ATEX 2014/34/EU or IECEx certification required. DNV 2.7-3 references but does not replace hazardous area certification.

Pressure equipment: Units containing pressure vessels, piping, pumps, must comply with PED 2014/68/EU or ASME BPVC depending on jurisdiction. DNV 2.7-3 references pressure equipment certification.

Electrical: Power generation, distribution, lighting, control systems per IEC 60092, IEC 60309, IEC 61439, IEC 61892. Hazardous area electrical per IEC 60079 series (ATEX/IECEx).

Certification process: Manufacturer approval (per DNV 2.7-1 procedure), unit type approval (DNV reviews design + fabrication), unit certification (after FAT), periodic inspection (annually, full inspection every 5 years).

Documentation: Design report (DNV-ST-0377 based), equipment list (pressure, electrical, mechanical), integration test report, FAT report, marking, periodic inspection schedule, maintenance manual.

Inspection by zone: External (annual), structural (5-year), equipment-specific (per OEM schedule), NDT for structural members (UT, MT, PT), pressure equipment (per PED / BPVC schedule).

B2B recommendation: For offshore POU orders, require DNV 2.7-3 type approval + hazardous area certificates (ATEX/IECEx) + pressure equipment certificates (PED/ASME) + electrical certificates + FAT/SIT reports.

Marquage + documentation conteneur offshore

Mandatory marking on each DNV-certified offshore container includes the certification plate, manufacturer plate, sling set plate, and unique identification. Documentation includes the certificate package and the periodic inspection schedule.

Certification plate (DNV 2.7-1 Section 4): DNV symbol, certificate number, manufacturer symbol, year of manufacture, MGW (Maximum Gross Weight), TARE weight, serial number, design temperature range, periodic inspection due date.

Manufacturer plate: Manufacturer name, address, model designation, fabrication year, material grade, dimensional specifications, country of origin.

Sling set plate (DNV 2.7-2): SWL (Safe Working Load), serial number, sling configuration (single-leg / 2-leg / 4-leg), manufacturer symbol, DNV certification mark, inspection due date.

Hazardous marking: For units containing hazardous materials (chemicals, batteries, flammables), GHS / UN marking + IMO Dangerous Goods marking + shipper declarations.

Doors and access: All access doors marked with internal hazards (electrical, mechanical, chemical, radiation, biohazard). Lock-out / tag-out (LOTO) points marked for maintenance.

Documentation package (per unit): (1) DNV Certificate of Compliance (CoC), (2) Design report per DNV-ST-0377, (3) Drawing package (general arrangement, structural, lifting points), (4) Material certificates (3.1 per EN 10204), (5) Welding procedure + welder qualification, (6) NDT records (UT, MT, PT), (7) FAT report, (8) Manufacturer plate photograph, (9) Marking photograph, (10) User manual.

Periodic inspection records: Annual visual inspection (photos, findings), 5-year full inspection (NDT, dimensional, lifting test), repair records (if any), recertification (if any).

Lifting markings: Each top corner casting marked with sling angle (60 degrees default), bottom corner castings (if 4-leg sling) marked with corresponding sling angle. Color-coded sling markers (red for primary, yellow for secondary, blue for auxiliary).

Operator manual: Loading limits, stacking limits, forklift pocket usage, sling angle requirements, door operation, drainage operation, periodic inspection schedule, maintenance schedule, storage requirements.

Digital documentation: Many operators now require digital twins, CAD models (STEP/IGES), maintenance manuals (PDF), and integration with operator's CMMS (Computerized Maintenance Management System).

B2B recommendation: Request digital documentation package (CAD models + PDF manuals) for integration with operator CMMS. Maintain spare copies on offshore platform for emergency reference.

Inspection périodique + recertification

DNV 2.7-1 and 2.7-3 require periodic inspection by DNV-certified inspectors or third-party IACS members. Inspection frequency varies by service severity and operator policy.

Annual visual inspection (DNV 2.7-1 Section 6): Visual examination of structure, doors, locks, hinges, seals, marking, drainage, sling set. Inspector checks for corrosion, cracks, deformation, missing marking, drainage blockage.

5-year full inspection (DNV 2.7-1 Section 6 + DNV-ST-0377): Dimensional check, NDT (UT for thickness, MT for surface cracks), structural integrity test, lifting test (with calibrated load cell), door / lock function test.

Special inspection: After storm exposure (significant wave impact), collision (dropped object), structural repair (cut + rewelding), 10-year service anniversary, or operator-specific trigger.

NDT methods: Visual testing (VT per ISO 9712), magnetic particle testing (MT per ISO 17638, for ferromagnetic welds), ultrasonic testing (UT per ISO 17640, for thickness and flaw detection), dye penetrant testing (PT per ISO 3452-1, for non-magnetic materials).

Inspector qualification: DNV-certified per DNV-OS-A101, IACS member society inspector, or operator-approved third-party per ISO 9712 (Level II minimum for VT, Level II for NDT methods).

Inspection certificate: DNV or third-party issues inspection certificate with findings, photos, recommendations. Valid until next inspection or specific date.

Recertification triggers: Structural repair (cut + re-welding), 10-year anniversary, change of service (e.g., from mud skip to chemical skip), operator-specific policy.

Inspection logbook: Each unit has a logbook (physical and digital) recording all inspections, findings, repairs, modifications. Operator + inspector both sign entries.

Sample inspection scope (typical 5-year): (1) Visual external + internal (VT), (2) Dimensional check (length, width, height, diagonal), (3) Door operation, (4) Forklift pocket integrity, (5) Sling set inspection, (6) Marking legibility, (7) Drainage test, (8) NDT on critical welds (top corner castings, door frames, forklift pockets), (9) Lifting test (125% MGW for 15 minutes), (10) Photographic record.

Cost estimate (2026 USD): Annual visual $300-600/unit. 5-year full $1,500-3,500/unit. Recertification $3,000-6,000/unit. Sling set replacement $800-2,500/set.

B2B recommendation: Negotiate inspection schedule with operator upfront. Maintain inspection logbook from day 1. Schedule 5-year inspection before expiry, not after (operators reject units with overdue inspection).

Corrélation valise de protection

Protective cases used inside DNV offshore containers (for sensitive equipment like electronics, instruments, calibration tools) must be designed to survive the offshore environment AND the container handling environment.

Double-protection model: Outer DNV offshore container (structural + environmental) + inner protective case (vibration + shock + moisture + dust + electromagnetic). Both certifications required.

Vibration levels: Offshore supply vessel transit creates sustained vibration (5-500 Hz, 0.5-5 g RMS depending on sea state). Inner case must dampen to <0.2 g RMS at equipment level.

Shock loads: Crane lifts (5-10 g peak), dropped objects (20-50 g peak for direct impact), wave slam (10-20 g peak for items near sea). Inner case must absorb without equipment damage.

Temperature range: Offshore units face -40°C (Arctic winter) to +60°C (tropical summer direct sun). Inner case must maintain internal temperature within equipment spec (typically 0°C to +40°C).

Humidity + salt spray: Offshore atmosphere 80-95% RH, salt concentration 0.5-5 mg/m3 (vs <0.1 mg/m3 onshore). Inner case must be hermetically sealed or have active humidity control.

IP rating: IP65 minimum for electronics, IP67 for prolonged offshore exposure, IP68 for subsea-adjacent deployment (within splash zone).

Material selection: Stainless steel (1.4401 / 1.4404) for structural members, aluminum (5083 / 6082) for weight-sensitive cases, engineering plastic (PP / PE / PA) for chemical resistance, foams (EPP / PE / EVA) for vibration damping.

Latches + hinges: Stainless steel hinges with positive locking, secondary retention. Tested per DNV-ST-0377 lifting + shock criteria.

Marking: Inner case marked with its own serial number, owner, contents list, weight, last inspection date. Compatible with container's documentation system.

Electromagnetic shielding: For electronics cases, EMI shielding per MIL-STD-461 or EN 55032 / EN 55035. Especially important for measurement equipment near offshore electrical systems.

B2B recommendation: For offshore-bound equipment, supply inner protective case with: IP67 rating, EMI shielding, vibration damping foam, humidity indicator, serial-tracked marking, and compatibility with operator CMMS.

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