Industries
Topside modules, jackets, offshore skids and FPSO packages designed for marine loads and offshore codes.
Quick answer
Structural Engineering Services supports Offshore & Marine projects worldwide with offshore platform structures, skid package design, lifting & rigging calculations, tekla 3d modeling — delivered by senior engineers on licensed software to international codes.
Governing codes
Sector challenges
Offshore scope is decided by what happens between the fabrication yard and final hook-up: lift cases, sea transport and a twenty-five year fatigue life in salt water. In-place strength is rarely what governs.
Challenge 01
Wave, current, wind and vessel motion act together, and the in-place condition is seldom the governing case.
How we answer it
Load cases are built from the metocean data and motion criteria in the design basis, and every member is checked against the full combination matrix, including transit accelerations.
Challenge 02
Welded tubular joints under ten million cycles fail at stress ranges a static check passes comfortably.
How we answer it
Hot-spot stress and S-N screening to DNV-RP-C203 on tubular joints and critical attachments, with detail categories chosen before the weld is detailed rather than justified afterwards.
Challenge 03
A module is at its weakest in the air or on a barge, yet padeyes, grillage and seafastening are often an afterthought.
How we answer it
Lifting analysis with dynamic amplification, skew load factor and a centre-of-gravity envelope, padeye and spreader checks, plus seafastening and load-out design issued with the structure.
Challenge 04
Splash-zone members lose steel for decades and inspection access offshore is expensive.
How we answer it
Corrosion allowance is zoned by elevation with coating and anode provision, and drainage, sealing and inspection access details are drawn on the shop drawings so the yard builds them in.
Relevant services
Modeling and detailing jackets, topsides, modules and offshore skids to offshore standards.
Explore
Engineering complete modular skids — vessels, piping, structure, lifting and foundations.
ExploreCalculating lifting lug, spreader and package lifting loads for safe installation.
Explore
Building a fully detailed, clash-free Tekla Structures model from which every drawing, report and CNC file is generated.
ExploreTypical assets
From a single assembly to a complete package — the asset types our offshore & marine teams work on week to week.
Process, utility and accommodation modules with primary and secondary steel.
Tubular jackets, braces, legs, mudmats and pile sleeves with joint can design.
Chemical injection, metering and utility skids built to offshore load and lift criteria.
Deck-mounted equipment, stools and supports designed for vessel motions.
Helideck framing, stairs, gratings and escape routes to offshore access rules.
Lifting lugs, trunnions, grillage and seafastening for load-out and transit.
Codes & specifications
The base code is only half the story. On offshore & marine work the client specification usually overrides it somewhere, so we agree a single reconciled design basis before any calculation starts.
Browse all codesBaseline for fixed offshore platforms: environmental loads, member and tubular joint checks.
Fatigue design — S-N curves and detail classification for welded tubular and plated joints.
Marine operations: the lift, transport and load-out factors applied to the structure.
North Sea scope: steel design, tubular joints and accidental limit states.
Member and connection capacity where topsides are framed in rolled sections.
Welding, joint preparation and inspection categories the detailing has to match.
Free quote
Send the drawings or datasheets you already have. We will tell you what is missing and quote the scope in 24 hours.
Project lifecycle
Most clients bring us in at detailed design. We can start earlier, or pick a package up mid-stream — here is what you get from us at each stage.
Options, preliminary sizing and budget tonnage, before the scheme is frozen.
Module weight report, lift feasibility and jacket configuration options.
You receive
Design basis, load schedules and layouts good enough to price and procure from.
Design basis against metocean data, primary steel sizing and a weight control report.
You receive
Full analysis, code checks, 3D modelling and issued-for-construction documentation.
In-place, transport and lift analysis plus a LOD 400 Tekla model for the yard.
You receive
Shop queries, RFIs and as-built updates while steel is being cut and erected.
Yard queries, weight reconciliation and seafastening or load-out mark-ups.
You receive
Deliverables & handover
Offshore packages are handed over with the weight report, lift data and fatigue summary as separate controlled documents, because the marine warranty surveyor will ask for each of them individually.
| Deliverable | Format | Issued at |
|---|---|---|
| Design basis and calculation report | PDF, signed and checked | Detailed design |
| General arrangement drawings | DWG + PDF | FEED to detailed design |
| Drawing register and transmittal | XLSX + PDF | Every issue |
| Tekla 3D model | Native .db1 + IFC 2x3/4 | Detailed design |
| Single-part, assembly and erection drawings | PDF + DWG, one sheet per mark | Detailed design |
| CNC files, bolt list and BOQ | NC1/DSTV, DXF, XLSX | Pre-fabrication |
| Package GA with shipping envelope | DWG + PDF | FEED to detailed design |
| Lifting, transport and foundation load data | PDF calculation + XLSX load table | Detailed design |
| Analysis model and load combinations | STAAD .std + PDF summary | Detailed design |
| Connection and base-plate design sheets | PDF calculation pack | Detailed design |
| Lift, transport and load-out analysis | PDF calculation + XLSX load tables | Detailed design |
| Weight and centre-of-gravity control report | XLSX + PDF, revised each issue | All stages |
Two-stage check
Originator, then senior checker signs off every sheet before it leaves our office.
Native files included
You own the model, so another team can pick the work up at any point.
Revision control
A revision table on every sheet; superseded issues are archived, never deleted.
Your transmittal route
Issued through your document-control portal with your numbering, or over secure FTP.
Directory
Jump straight to the market you build in. Every page sets out the governing codes, units and delivery window we work to there.
8 markets
Start your project
Free, no-obligation proposal from a senior engineer.