20ft Offshore Container — DNV 2.7-1 Certified Cargo Unit for Offshore Operations | LongTeng Industrial

Created on 09.11

A 20ft offshore container is not an ISO shipping container that happens to be at sea. It is a forklift-pocketed, sling-rigged steel unit engineered to be crane-lifted fully loaded onto an offshore platform, stacked six-high, salt-sprayed daily, and survive a North Sea winter.

It is built to DNV 2.7-1 / EN 12079 / ISO 10855 — the offshore lifting standard. The steel, lifting gear, corrosion package and inspection regime are entirely different from an ISO CSC unit.

Why 20ft

20ft is the workhorse size of the offshore rental fleet — the format drilling contractors and logistics operators standardize around.

Fits standard offshore basket handling spreaders

Payload up to 20–25 tons

Standard 20ft ISO footprint

Stackable 6-high empty

DNV 2.7-1 Certification

Every unit ships with a valid DNV 2.7-1 certificate. LongTeng can also arrange certification through Lloyd's Register, Bureau Veritas, ABS or RINA depending on your flag state and end-customer requirements.

The certificate covers three things a regular CSC plate does not:

Area	What It Verifies
Structural integrity	Survives 1.3× dynamic lifting factor, side impacts, stack pressure
Lifting gear	Every sling, shackle and pad eye rated, tested, serialized and traceable
Inspection regime	12-month visual inspection, 48-month full re-certification by independent body

Specifications

Parameter	Standard
External (L × W × H)	6,058 × 2,438 × 2,591 mm
Internal volume	~33.2 m³
Tare weight	3000 kg
Max payload	12000 kg
Stackability	6-high empty
Frame steel	SS400 / Q235B
Floor	3-mm checker plate (marine plywood optional)
Doors	One-end swing doors standard; side door, roll-up, open-top available
Lifting	4× top pad eyes + 4× bottom forklift pockets + DNV sling set
Coating	C5-M marine system, ≥ 280 μm DFT
Operating temp	-40 °C to +70 °C
Design life	15+ years with normal inspection

Built for Repeated Heavy Lifts

Frame: SS400 / Q235B structural steel, welded to ISO 1161 corner casting geometry.

Walls and roof: 2-mm corrugated steel, welded into the frame — not pop-riveted.

Doors: Multi-point locking rods, stainless steel hardware, gasketed against ingress.

Pad eyes: Forged, not cast. Each carries its own test certificate and serial number traceable to the DNV file.

C5-M Corrosion System

Standard marine-grade coating built for ISO 12944 C5-M (the highest corrosivity class):

Shot blast to Sa 2.5

Epoxy zinc-rich primer — 80 μm

Epoxy intermediate — 120 μm

Polyurethane topcoat — 80 μm

Total DFT ≥ 280 μm, verified by gauge at multiple points

For splash zones, glass-flake epoxy upgrade to ≥ 400 μm is available.

LongTeng Factory Edge

Unlike a trading company, LongTeng owns the production floor — 50,000 m², two dedicated offshore-assembly lines, welders certified to AWS / EN ISO 9606.

Direct factory pricing

Engineering in-house

Lead time:

Third-party inspection welcome

QC Sequence

Material certs → in-process weld inspection → dimensional QC → coating DFT → load test at rated payload → sling proof load at 1.3× SWL → PDI → DNV survey and certification.

Customization

Side door, roll-up door, open-top; marine plywood / GRP floor; ventilation / explosion-proof fans (ATEX); internal racks and shelving; PU insulation; GRP lining; electrical fit-out; customer color, logo and fleet numbering; C5-I splash-zone coating.

Get a Quote

Send us: quantity, payload, operating environment, door config, internal fit-out, certification body (DNV/LR/BV/ABS/RINA), delivery terms and third-party inspector.

Standard quote in 2 business days. Custom in 5 days after drawing approval.

LongTeng Group is a private owned enterprise group involves in designing, manufacturing, trading and transporting of ISO dry cargo container, special container and house container, reefer container, tank container. Also provide container spare parts for repairing and manufacturing new container. The group have exported to over 60 countries. The total annual production capacity is 120,000 TEU of ISO Containers.