Offshore Containers and Portable Units: The Approvals in Our Register

Offshore containers, portable offshore units and the lifting sets that move them on and off deck are among the most frequently certified pieces of loose equipment in the offshore supply chain. Every basket, tank container, workshop container or skid that goes over the side on a crane wire needs a type approval that a class society, flag state or charterer will actually check before the unit is allowed on a vessel or platform. The review below is built from our own type-approval register and our supplier directory, not from published market research, and it is aimed at people who specify, buy, inspect or service this kind of equipment: technical superintendents, offshore logistics and procurement teams, yard planners and service engineers.

The findings cover 1,052 products from 354 manufacturers in our type-approval register whose DNV product type falls under Offshore Container, Portable Offshore Unit, Lifting set for offshore containers and portable offshore units, Offshore Tank Container, Portable Tank, CSC / ISO container or ISO Freight Container. They also draw on our supplier directory, where 748 firms carry a profile that mentions offshore containers or containers in general. None of the numbers below describe the wider world market; they describe what sits in our own register and directory today, September 2026.

Two things stand out before the detail. First, the register is dominated by one product type rather than spread evenly across all of them. Second, the manufacturer base behind that register is wide rather than concentrated in a handful of names, though a few corporate families show up more than once under slightly different legal names. Both points matter for anyone drawing up an approved-manufacturer shortlist or trying to work out how much real choice exists for a given container or lifting-set type.

What our register covers for offshore containers and portable units

All 1,052 entries in this slice of the register sit under a single certificate group, Type Approval, issued to 354 distinct manufacturers. That differs from equipment categories where approvals split across several certificate families; here, everything a buyer will ask a manufacturer to produce comes down to one type-approval certificate per product.

The basis for this count is a match on DNV product type: Offshore Container, Portable Offshore Unit, Lifting set for offshore containers and portable offshore units (recorded twice in the register under near-identical names that differ only in capitalization, at 77 and 35 products respectively), Offshore Tank Container, Portable Tank, CSC / ISO container and ISO Freight Container. It is worth treating the two lifting-set entries as one product family split across two register rows rather than as two separate families with different scopes.

Product types in the register

Within this basis, the eight recorded product types differ enormously in size, both in the number of approved products and in the number of manufacturers standing behind them:

• Offshore Container - 735 products from 214 manufacturers. The general-purpose steel box for tools, spares, chemicals and general cargo moved between shore base, vessel and platform; by far the largest product type in the register.
• Portable Offshore Units - 115 products from 55 manufacturers. Purpose-built units such as workshop containers, mud skids and equipment skids fitted out for a specific job rather than general cargo carriage.
• Lifting set for offshore containers and portable offshore units - 77 products from 65 manufacturers under one register entry, plus a second entry for the same family at 35 products from 22 manufacturers. Wire rope slings and shackle sets rated for lifting the containers and units listed here, with an unusually close ratio of products to manufacturers because many of these sets are rated to a specific container design rather than sold as a generic item.
• Offshore Tank Container - 41 products from 22 manufacturers. Tank frames built to carry bulk liquids and chemicals such as drilling fluids.
• CSC / ISO container - 18 products from 9 manufacturers. Standard freight containers carrying an offshore-specific approval rather than only a shore-to-shore transport certificate.
• Portable Tank - 16 products from 8 manufacturers.
• ISO Freight Container - 15 products from 9 manufacturers.

Sample entries from the register show the range that sits inside these categories: wire rope lifting sets from Process Components Limited, a 10m basket from Suretank Ltd, a Skid for Air Receiver from Al Fuzail Engineering Services WLL, an EHDM Shipping Skid from 4Subsea Astori AS, a Mud skid from Al Wazan Trading, a Container for Mud Logging Unit from Yangzhou Tonglee Reefer Container Co., Ltd., a Stairway container and a 14ft workshop container from Swire Energy Service AS, and an Offshore frame, type 850CFM, from Ferrite Steel Engineering Sdn Bhd. Between them these entries make the point that "offshore container" in the register stretches from a plain cargo box to a fully outfitted mud logging unit.

Who holds the approvals

The largest holders of approvals in this slice of the register, by number of approved products, are:

• National Oilwell Varco UK Limited (United Kingdom) - 50 products
• Suretank Ltd (Ireland) - 34 products
• NOV ELMAR, a division of National Oilwell Varco UK Limited (United Kingdom) - 34 products
• Magnum Technology Center FZE (United Arab Emirates) - 24 products
• Yangzhou Tonglee Reefer Container Co., Ltd. (China) - 24 products
• RMZ Oilfield Engineering Pte Ltd (Singapore) - 21 products
• VG Offshore Containers International (M) Sdn Bhd (Malaysia) - 20 products
• TNR Offshore Celik Yapi San. ve Tic. A.S. (Turkey) - 20 products
• Swire Energy Service AS (Norway) - 20 products
• Petrocast Metal Industries L.L.C (United Arab Emirates) - 18 products
• HARGEN OFFSHORE CONTAINERS LTDA (Brazil) - 17 products

National Oilwell Varco appears three separate times in that list under three legal names: National Oilwell Varco UK Limited with 50 products, its division NOV ELMAR with 34, and National Oilwell Varco UK Ltd with a further 15 elsewhere in the full manufacturer list. That is one corporate family recorded across three register entries, not three unrelated competitors, and it should be read as one dominant supplier group rather than three separate small ones.

By country of manufacturer, the United Arab Emirates leads with 56 manufacturers holding approvals in this register, ahead of the United Kingdom with 47 and the United States with 39. Malaysia and China follow with 21 each, then Norway with 20, India with 17, the Netherlands with 14, Qatar with 11 and Mexico with 10. With 354 manufacturers in total, spread well beyond these ten leading countries, this is a broad manufacturer base rather than one concentrated in a single yard or region; a buyer working an approved-vendor list still has real alternatives even after ruling out any single name or country.

Validity and expiry

Of the certificates recorded in this slice of the register, 1,018 are currently valid, 39 are expired and 1 is revoked. The great majority of manufacturers in the register hold live approvals today, but the expired and revoked entries are a reminder that a product type name on a manufacturer's website is not the same thing as a current, checkable certificate.

Certificate expiry dates are spread across the years ahead: 108 expire in 2026, 140 in 2027, 180 in 2028, 224 in 2029, 281 in 2030 and 125 in 2031. The single largest cluster of expiries falls in 2030. Anyone specifying equipment now for a project that delivers or docks in that window should check the specific certificate rather than assume the product type itself stays approved throughout.

The practical takeaway for a buyer or superintendent is straightforward: always request the current certificate for the exact product and manufacturer, not a type name copied from a catalogue, and check its expiry date against the expected delivery or dock date before the order is placed, not after the unit arrives on the quay.

Where to find service and supply

Our supplier directory carries 748 firms whose profile mentions offshore containers or containers more generally, a wider net than the manufacturer list in the type-approval register above, because it also catches shipping companies, ship managers and repair yards whose fleet or service scope touches container-carrying vessels or container handling rather than only firms that build the boxes themselves.

By country, this directory slice is led by Germany with 94 entries, followed by China with 62, the United States with 49, the Netherlands with 32, the United Kingdom with 28, Turkey with 26, Japan with 22 and India with 21.

A handful of examples from the directory show the range this search actually returns: Wilhelmsen Ahrenkiel Ship Management (Netherlands), a shipping company operating geared bulk carriers with their own deck cranes; Ernst Russ GmbH & Co KG (Germany), a shipping company with a similar geared-bulker and crane profile; Tersan Shipyard - Tuzla Repair Branch (Turkey), a ship repair yard whose Tuzla office lists work on bulk carriers, general cargo ships and container vessels, including hold cleaning; NSB GROUP (Reederei NSB Niederelbe) (Germany), a technical ship manager running a mixed fleet that includes container ships and tankers; and A.M. Nomikos Transworld Maritime Agencies S.A. (Greece), a shipping agency associated with geared bulk carriers. None of these five firms are container manufacturers in the register sense described above; they surface here because their profile text mentions containers in the context of their fleet or their yard's service scope, which is a useful reminder to read a directory hit closely before assuming it is a supplier of the equipment itself.

How to use this when specifying or buying

• Match the product type named in a quote against the exact register categories (Offshore Container, Portable Offshore Unit, Offshore Tank Container, Portable Tank, CSC / ISO container, ISO Freight Container, or the lifting-set family) rather than a generic description on a data sheet.
• Ask the manufacturer for the current type-approval certificate for the specific model on offer, not a general statement that the company's containers are approved.
• Check the certificate's expiry date against the delivery date and, where the unit is going straight to a vessel or platform, against the next dock or survey window.
• Where a lifting set is supplied together with a container, confirm the set itself carries its own approval under the lifting-set product type rather than assuming the container's approval extends to it.
• If a manufacturer name is close to another one on an approved list, such as the several National Oilwell Varco entries described above, confirm which legal entity actually issued the quote and holds the certificate.
• Weigh a shortlisted manufacturer's country against the distribution above; a supplier outside the largest clusters is not automatically less credible, but its approval status is still worth confirming directly rather than assumed from scale.
• Use the supplier directory to find service or repair capacity near a port or yard, then verify with the firm directly whether it actually handles offshore containers, since a directory match is based on profile text rather than a certified service scope.

Frequently asked questions

Is an ISO freight container the same as an offshore container?

No. Both are recorded as separate product types in our register: ISO Freight Container, with 15 products from 9 manufacturers, and CSC / ISO container, with 18 products from 9 manufacturers, are distinct from Offshore Container, with 735 products from 214 manufacturers, which carries the offshore-specific type approval that a standard shore-to-shore ISO box does not.

Does a container's type approval cover its lifting set as well?

Not automatically. Lifting sets for offshore containers and portable offshore units are recorded as their own product type, with 77 products from 65 manufacturers under one register entry and a further 35 products from 22 manufacturers under a second entry for the same family. Treat the lifting set as a separate item to check for its own approval, even when it is sold together with the container.

How many manufacturers actually offer a given product type?

It depends heavily on the type. Offshore Container has 214 manufacturers behind its 735 products, and the lifting-set family has 65 manufacturers behind 77 products, close to a one-to-one ratio. At the other end, Portable Tank has 8 manufacturers behind 16 products and ISO Freight Container has 9 manufacturers behind 15 products, so the realistic shortlist for those two types is much shorter.

Where should a technical buyer start when sourcing service or repair support near a port?

Start with the supplier directory rather than the type-approval register, since the register lists who is approved to build a product rather than who is available locally to service, repair or requalify one. Our directory currently carries 748 firms whose profile mentions containers, concentrated in Germany, China, the United States and the Netherlands, but confirm directly with any shortlisted firm that offshore containers specifically, not just general container traffic, sit within its scope.