01
Environment
Offshore floating production, processing, storage, and utility systems
RTI industry authority
Alloy Components for FPSO Systems
FPSO projects combine offshore exposure with process equipment, utilities, seawater, produced fluids, limited storage, module interfaces, and strict project controls. RTI helps procurement teams define the component in full: service, material route, pressure class, facing, bore, standards, inspection plan, certificates, preservation, packing, and delivery condition are all visible before quotation.
Quick engineering snapshot
Service context before material selection.
These controlled signals help start a technical conversation. Final component and alloy approval stays with the governing project specification and responsible engineering authority.
| Specification | Verified value | Unit |
|---|---|---|
| Environment | Offshore floating production, processing, storage, and utility systems | - |
| Corrosion focus | Marine chlorides, produced-water chemistry, process contaminants, crevice geometry, wet-dry cycling, and galvanic interfaces are reviewed by service and location. | - |
| Temperature consideration | Process temperature, thermal cycles, insulation, ambient marine exposure, and start-up or shutdown conditions should accompany the RFQ. | - |
| Pressure and containment | Piping class, pressure class, joint type, facing, bore, gasket, bolting, and module connection data must be consistent with the approved design basis. | - |
| Common component route | FPSO module piping class, pressure class, facing, gasket, and joint details / line schedule or bore, end preparation, reducer geometry, and installation orientation | - |
Operating environment
The component is only as well specified as the service around it.
The technical environment map keeps corrosion, temperature, pressure, product details, inspection, and documentation in the same decision path.
Technical environment map
Marine process envelope
02
Corrosion
Marine chlorides, produced-water chemistry, process contaminants, crevice geometry, wet-dry cycling, and galvanic interfaces are reviewed by service and location.
03
Temperature
Process temperature, thermal cycles, insulation, ambient marine exposure, and start-up or shutdown conditions should accompany the RFQ.
04
Pressure
Piping class, pressure class, joint type, facing, bore, gasket, bolting, and module connection data must be consistent with the approved design basis.
05
Release
Specification, inspection, traceability, and delivery documentation
Corrosion and temperature
Review the mechanism, then confirm the material route.
Corrosion performance changes with the actual medium, temperature, geometry, fabrication, and operating conditions. The alloy name does not replace service-specific engineering review.
Mechanism first
Marine chlorides, produced-water chemistry, process contaminants, crevice geometry, wet-dry cycling, and galvanic interfaces are reviewed by service and location.
Temperature changes the decision
Process temperature, thermal cycles, insulation, ambient marine exposure, and start-up or shutdown conditions should accompany the RFQ.
Geometry and fabrication matter
Crevices, stagnant zones, weld details, insulation interfaces, gasket selection, and cleaning practice should be reviewed alongside the nominal alloy grade.
Commonly considered alloys
Comparison paths for an informed specification review.
These material pages provide technical information. They are not a substitute for the project material selection process or an approved substitution.
Super Duplex 2507 / UNS S32750
Super duplex benchmark for chloride-rich and seawater-related applications.
Inconel 625 / UNS N06625
Nickel alloy benchmark for severe corrosion, seawater, and elevated-temperature review.
Stainless Steel 316L / UNS S31603
Low-carbon molybdenum-bearing stainless benchmark for controlled process service.
Flanges and pipe fittings
Connection details control the commercial outcome.
For each component, keep material, product-form standard, dimensional standard, pressure class, facing, bore or schedule, testing, and document release separated and clear.
Flanges
Flange selection should confirm FPSO module piping class, pressure class, facing, gasket, and joint details, pressure class, facing, bore, gasket system, bolting, machining, and any drawing-controlled details before quotation.
Pipe fittings
Elbows, tees, reducers, caps, stub ends, and forged fittings should align line schedule or bore, end preparation, reducer geometry, and installation orientation before a purchase order is released.
Material route
Material grade, product-form standard, dimensional standard, inspection plan, marking, packing, and document release are separate controls. They should be written separately in the RFQ.
Relevant standards
Use the right document for the right control.
Product material standard, component dimensional standard, test-certificate route, and project specification each answer a different procurement question.
ASME B16.5 Flange Guide
Flange size, class, facing, and RFQ controls.
ASME B16.9 Fittings Guide
Buttwelding fitting dimensions and procurement controls.
NACE MR0175 / ISO 15156 Guide
Sour-service review and order-specific documentation control.
Material Traceability Guide
Heat number, MTC, PMI, marking, and dossier control.
Quality and inspection
Traceability belongs in the RFQ, not at dispatch.
PMI, MTC, EN 10204 3.1, TPI attendance, test records, markings, and release documentation should be aligned with the actual project and ordered product form.
PMI and grade segregation
Define the PMI method, sampling plan, acceptance criteria, and record format when alloy identity is critical to the service or project quality plan.
Material certificates
Request MTC and EN 10204 3.1 documentation when manufacturer-issued inspection records are required, then reconcile heat number, grade, product form, standard, test results, and final marking.
Inspection plan
Agree the ITP, PMI scope, document review gates, marking, preservation, packing, and any EPC or TPI attendance before manufacturing starts.
Order-specific testing
Project-specific material, NDE, pressure, corrosion, and dossier requirements must be stated against the order line and approved ITP.
Procurement guidance
Build an RFQ an engineer can approve.
A complete enquiry reduces clarification cycles and makes inspection, documentation, packing, and delivery expectations visible from the start.
Design basis
State the fluid or process medium, concentration or contaminants where relevant, design and upset temperatures, design pressure, corrosion allowance, and governing project specification. Final material selection remains an engineering approval.
Commercial scope
Capture module, line, tag, material, connection, documents, packing, lifting or protection needs, shipment sequence, and destination details in the RFQ.
Document release
Agree document requirements, review points, TPI attendance where required, marking, protective facing covers, packing method, and destination requirements before production release.
No unapproved substitution
Do not treat similar alloy names as interchangeable. Any substitution needs the engineering authority to compare service, product standard, dimensions, tests, and documentation requirements.
Related RTI pathways
Continue the specification review.
Use material data pages, product pages, and engineering guides together when preparing a technical quotation.
Super Duplex 2507 / UNS S32750
Super duplex benchmark for chloride-rich and seawater-related applications.
Inconel 625 / UNS N06625
Nickel alloy benchmark for severe corrosion, seawater, and elevated-temperature review.
Stainless Steel 316L / UNS S31603
Low-carbon molybdenum-bearing stainless benchmark for controlled process service.
Engineering FAQs
Common fpso procurement questions.
Answers frame the information that belongs in the RFQ and do not replace formal design review or the project specification.
Structured RFQ
Prepare a cleaner component enquiry
Capture material, standard, dimensions, quantity, inspection, documentation, packing, and destination before the technical quotation is prepared.
Technical quotation
Define your fpso component package.
Share the service context, material, product, dimensions, pressure class, facing, testing, documents, destination, and drawing or datasheet details. RTI will use the information to structure the technical quotation pathway.
