Workshop to Deck: What Really Decides Offshore Module Delivery for an FPSO Skid (2026)

In the first quarter of 2026, SBM Offshore picked up the FEED contract for ExxonMobil's Longtail FPSO offshore Guyana, while the P-81 and P-87 awards for Petrobras moved toward signature offshore Brazil. New tenders are surfacing across Brazil, West Africa and Guyana, and the FPSO order book — quiet for a couple of years — is filling again. Every one of these floaters is being built the same way: as a stack of pre-engineered, skid-mounted process modules fabricated in workshops, shipped to an integration yard, and lifted onto the deck.

Here is the part most procurement conversations skip. A module can pass its Factory Acceptance Test in perfect condition and still arrive at the integration yard as a problem — corroded after a six-week ocean voyage, off its lifting plan, with an Ex certificate that doesn't match the equipment that turned up, or with coating chewed off where a chain bit into an unprotected edge. The engineering that decides this happens in the last mile: the stretch between the workshop floor and the FPSO deck. It rarely appears on the RFQ, and almost no fabricator's marketing talks about it — because it is unglamorous, document-heavy, and exactly where module logistics quietly becomes the program's critical path.

We've built marine and offshore skids for the better part of a decade: reliquefaction units, BOG compressor skids, fuel-gas and bunkering modules, CIP and methanol skids, water-glycol and solenoid packages — delivered under DNV, ABS, BV, CCS, LR and NK, to customers in more than 50 countries. Across those deliveries, the same six engineering decisions separate a module that arrives ready to integrate from one that arrives needing a repair team. This is the workshop-to-deck checklist.

The Short Version

For procurement and logistics teams who want the conclusion first, offshore module delivery for an FPSO skid is decided by six things — none of them the skid price:

1. Sea-fastening design — is the module engineered to survive the voyage, with documented tie-down points and load cases the marine warranty surveyor can sign off fast?
2. Marine corrosion-protection / coating system — is the coating spec built for the offshore environment (C5-M / splash zone) and the voyage, not a generic shop paint?
3. Ex equipment & wiring compliance — does every hazardous-area item arrive with certification that matches what's physically on the skid, with as-built wiring documentation?
4. Transport & lifting load cases — are the voyage, transport and lift conditions all checked, with lugs and the CoG verified for the real cases?
5. Packing & shipping protection — is the module protected from coating damage, water ingress and salt during transit, with preservation that survives the timeline?
6. On-site integration & commissioning hand-off — does the documentation and the support let the integrator set, tie in and start the module without chasing the supplier?

Price and lead time are necessary, not sufficient. The six below are where a module either arrives ready — or arrives as a repair job.

1. Sea-Fastening Design

A module that is fabricated, tested and beautifully painted is still worthless if it doesn't survive the voyage. The transport from the fabrication workshop to the integration yard — often a multi-week ocean passage on a deck barge or heavy-lift vessel — subjects the module to accelerations from pitch, roll and heave that can dwarf its static weight. Sea-fastening is the engineering that keeps the module bolted to the transport deck through that.

The mistake we see in the market is treating sea-fastening as a yard problem, designed after the module is built and the barge is booked. Done that way, it becomes a scramble of welded clips and chain that the marine warranty surveyor (MWS) then has to question, often forcing rework right before sail-away. Serious fabricators design it the other way around:

• Tie-down points engineered into the frame from the start — not clipped on at the dock — with the structure checked to take the sea-fastening loads.
• Documented load cases for the actual voyage class and route, so the MWS reviews a calculation, not a hope.
• A sea-fastening arrangement drawing that shows where every grillage, stopper and lashing goes, ready for the MWS and the transport contractor.

When we ship a process skid into a vessel program, the sea-fastening provisions are part of the frame design, because a tie-down weld added at the dock is a tie-down weld nobody calculated. The payoff for the EPC is a fast MWS review and a sail-away that holds the schedule.

What good looks like: the fabricator hands the MWS a sea-fastening drawing and load-case calc with the module — not a request to "figure it out at the quay."

2. Marine Corrosion-Protection / Coating System

Offshore is one of the harshest corrosion environments on earth. An FPSO module lives in an ISO 12944 C5-M (marine) or worse environment for decades, and it has to survive a salt-laden ocean voyage before it even arrives. A coating system that was fine for an onshore skid bolted to a concrete pad will fail offshore — and a coating failure on a module already on the deck is enormously expensive to fix.

The coating system is not "paint." It is a specified, documented, multi-coat system tied to the environment and the substrate:

• An offshore coating spec — typically to ISO 12944-5 (for the relevant C5-M / CX category and design life) or NORSOK M-501 for North Sea-flavored projects — with the right primer / intermediate / topcoat stack, dry-film thickness per coat, and surface-prep standard (e.g. Sa 2½ blast).
• Surface preparation and application records — blast profile, ambient/dew-point conditions at application, DFT readings — because a coating system is only as good as the day it was sprayed.
• Damage protection for the voyage — touch-up procedures and protected edges so the system that arrives is the system that was specified, not a chain-scarred version of it.

Coating item	Why the EPC cares	What to ask for in the RFQ
Environment category	Defines the whole system	ISO 12944 C5-M / CX or NORSOK M-501 spec
Coat stack & DFT	Design life, warranty	Primer/intermediate/topcoat + DFT per coat
Surface prep	Adhesion, longevity	Blast standard (Sa 2½) + profile records
Application records	Proof it was done right	DFT readings + ambient/dew-point log
Voyage protection	Arrives as specified	Touch-up procedure + edge protection

The difference between a fabricator who hands you a coating inspection report tied to the spec and one who "painted it grey" is the difference between a 20-year system and a maintenance line item on year three.

3. Ex Equipment & Wiring Compliance

FPSO topsides are hazardous-area environments, and the delivery problem is not just having certified equipment — it is making sure the certification on paper matches the equipment that physically arrives, with the as-built wiring to prove it. A module can leave the workshop with the right intentions and arrive with a substituted junction box, a motor whose Ex marking doesn't match the data book, or terminations that don't reconcile with the loop drawings. That gap surfaces during the class survey or, worse, at energization.

Buyers and surveyors look for a clean Ex spine through delivery:

• Hazardous-area equipment (motors, instruments, junction boxes, lighting, cable glands) certified to the project's required protection type, gas group and temperature class for the zone — with the certificates collated and matching the actual installed items.
• As-built electrical documentation — loop drawings, cable schedules, termination records that reflect what was actually wired, not just the design intent.
• An Ex inspection record (to the relevant IEC 60079 inspection regime) carried out before the module ships, so the integrator inherits a verified installation, not an unknown one.

A module is only as certifiable as its weakest undocumented Ex component. The fabricators who win repeat offshore work treat the Ex certification and as-built wiring package as a delivery item, packed with the module — not as paperwork to reconcile after it lands.

4. Transport & Lifting Load Cases

A module experiences several distinct mechanical conditions on its way to the deck, and each is a separate load case that has to be checked: the lift onto the barge, the voyage (with its dynamic accelerations), the lift off at the integration yard, and the final lift onto the FPSO deck. A module designed only for its static in-service weight — or with generic lifting lugs — can be perfectly sound on the platform and fail somewhere in transit.

Serious fabricators treat the journey as a set of engineered conditions:

• Lifting lugs designed and certified for the actual lift cases — sling angles, hook positions and load factors worked out, not a generic lug pattern copied from the last job.
• A verified weight and center-of-gravity report carried through to as-built, because the lift plan and the sea-fastening both depend on the real CoG, not the model's.
• Transport and voyage load cases that account for the barge or heavy-lift motions on the planned route, feeding both the sea-fastening (§1) and the structural check of the frame.

The lift onto a billion-dollar floater is not the place to discover that the lugs were sized for the wrong case. A supplier who delivers a lift study and a verified weight/CoG report with the module gives the integrator a lift they can plan with confidence.

5. Packing & Shipping Protection

Between FAT and hook-up, a module can sit on a quay, ride a barge through salt spray, and wait in a laydown yard — sometimes for weeks. Everything that protects it through that window is preservation engineering, and it is the most underrated line in the delivery scope. Loose-shipped items get lost, machined faces rust, instruments take water, and coating gets scarred — and every one of those becomes a repair the integrator absorbs.

Good preservation and packing covers:

• Equipment preservation — rotating equipment protected and tagged for preservation intervals, machined surfaces coated, openings (flanges, nozzles) capped and sealed against water and salt.
• Protected and inventoried loose-shipped items — spool pieces, gaskets, fasteners, instruments crated, labelled and listed against a packing list that the integrator can reconcile on arrival.
• A packing list and preservation procedure matched to the expected transit and storage time, so the module that is unpacked at the yard is the complete module that left the workshop.

The cost of a missing gasket or a water-damaged instrument is rarely the part itself — it's the hook-up day it costs. A fabricator who ships a reconcilable packing list and a preservation plan saves the integrator from discovering the gaps the hard way.

6. On-Site Integration & Commissioning Hand-Off

A module is not "delivered" when it lands at the yard. It is delivered when it has been set, tied in, energized and started up. The last decision — and the one that separates a vendor from a partner — is whether the supplier hands over a module the integrator can actually integrate without chasing them across time zones.

• A complete, reconciled documentation package arriving with the module — Manufacturing Record Book (MRB) with material certs, NDT and test records, coating reports, Ex certs, as-built drawings and the packing list — so the integrator is verifying, not hunting.
• Interface and tie-in clarity carried into delivery — the battery-limit drawing, tagged terminations and tie-in points that map to the integration model, so hook-up is connect-the-documented-points, not reverse-engineer-the-skid.
• Available engineering support for the integration and commissioning window — someone competent reachable for the questions that always come up at hook-up and start-up, not a supplier that goes quiet after the final invoice.

The cost of an unanswered integration question offshore is measured in vessel-days. The integrators who have been burned once weight this hand-off heavily ever after.

How the Six Fit Together

None of these six is exotic. What's hard is doing all six, every time, so that a module which passed FAT in the workshop also arrives ready to integrate on the date a billion-dollar floater depends on. A delivery scope that stops at the FAT certificate — or a price comparison that ignores the last mile — flattens these into nothing and hides exactly the costs that land after the PO.

Dimension	The hidden risk if ignored	The question to put in your RFQ
1. Sea-fastening	MWS rework, delayed sail-away	"Show me your sea-fastening drawing and load cases."
2. Coating system	Offshore coating failure	"Give me your ISO 12944 / NORSOK M-501 spec and DFT records."
3. Ex compliance	Failed class survey at energization	"Provide Ex certs matching the as-built wiring."
4. Lifting load cases	Lift re-engineering at the yard	"Give me the lift study and verified weight/CoG."
5. Packing & preservation	Missing/damaged items at hook-up	"Provide your packing list and preservation procedure."
6. Integration hand-off	Vessel-days lost at start-up	"Who supports set, tie-in and commissioning?"

A fabricator who can answer all six with evidence is not the cheapest line on your bid tab. They are the one whose module you can stop worrying about between the workshop and the deck — which, on an FPSO program where logistics is the critical path, is most of what you are actually paying for.

FAQ

What does "offshore module delivery" actually include beyond shipping the skid?
Far more than freight. It includes sea-fastening design for the voyage, a marine-grade corrosion-protection coating system, Ex equipment certification reconciled to the as-built wiring, transport and lifting load-case engineering, preservation and packing that survives weeks of transit, and a documentation and support hand-off so the integrator can set, tie in and commission the module. The skid price covers the steel and equipment; the delivery scope is what gets it onto the deck ready to work.

Why is sea-fastening such a big deal if the module already passed FAT?
Because FAT proves the module works on the workshop floor — it says nothing about whether it survives a multi-week ocean voyage. Pitch, roll and heave generate dynamic loads that can exceed the static weight, and a module that isn't fastened to engineered, documented tie-down points can shift or be damaged in transit, and will hold up the marine warranty surveyor's approval before sail-away. Designing sea-fastening into the frame up front is the cheapest way to protect the delivery.

What coating standard should an FPSO module be specified to?
For most offshore work, ISO 12944 with the C5-M (marine) or CX category and a defined design life, or NORSOK M-501 for North Sea-flavored projects. What matters as much as the standard is the documentation: the coat stack and dry-film thickness per coat, the surface-preparation standard (typically Sa 2½ blast), and the application records (DFT readings, ambient and dew-point conditions). A spec without inspection records behind it is not a coating system you can rely on offshore.

How do I make sure the Ex equipment that arrives matches the certificates?
Ask for the Ex certification package to be collated against the actual installed items, with as-built electrical documentation — loop drawings, cable schedules and termination records that reflect what was wired, not just the design — plus an Ex inspection record (to the relevant IEC 60079 regime) carried out before the module ships. That way the integrator inherits a verified installation instead of reconciling paperwork at energization.

Further Reading

• Modular Skid Packages: Workshop to Sea Trial
• Reliquefaction Skids: A Decade of Series Delivery
• BOG Compressor Skids for LNG-Fuelled Vessels
• Fuel Gas Supply System (FGSS) Skids
• Lmart Marine & Offshore Project References

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Lmart (Suzhou Lmart Energy Equipment Co., Ltd.) designs, fabricates, integrates, tests, documents and delivers modular process skids for marine and offshore programs in-house, certified across DNV, ABS, BV, CCS, LR and NK, to customers in more than 50 countries. If you're planning the delivery of skid-mounted modules for an FPSO or offshore package, we're happy to walk through any of the six dimensions above for your scope.