01
Environment
Separation, dehydration, compression, treatment, and transfer systems
RTI industry authority
Alloy Flanges and Fittings for Gas Processing
Gas processing equipment can combine acid gases, condensate, water, solids, dehydration media, compression, and high-pressure piping classes. RTI helps procurement teams capture the service description, design conditions, alloy requirement, standards, inspection, testing, certificates, and destination details that turn a generic enquiry into a technically reviewable request.
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 | Separation, dehydration, compression, treatment, and transfer systems | - |
| Corrosion focus | Carbon dioxide, hydrogen sulfide, chlorides, free water, condensate, solids, deposits, and local geometry should be assessed as part of the corrosion review. | - |
| Temperature consideration | Temperature ranges, Joule-Thomson effects, compression heat, start-up and shutdown cases, and insulation condition may change the material and sealing review. | - |
| Pressure and containment | Confirm the piping class, pressure class, facing, gasket, bore, schedule, and compatible mating connection against the approved design basis. | - |
| Common component route | gas-service piping class, pressure class, facing, and gasket selection / line bore, schedule, end preparation, and fitting configuration | - |
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
Process-system envelope
02
Corrosion
Carbon dioxide, hydrogen sulfide, chlorides, free water, condensate, solids, deposits, and local geometry should be assessed as part of the corrosion review.
03
Temperature
Temperature ranges, Joule-Thomson effects, compression heat, start-up and shutdown cases, and insulation condition may change the material and sealing review.
04
Pressure
Confirm the piping class, pressure class, facing, gasket, bore, schedule, and compatible mating connection against 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
Carbon dioxide, hydrogen sulfide, chlorides, free water, condensate, solids, deposits, and local geometry should be assessed as part of the corrosion review.
Temperature changes the decision
Temperature ranges, Joule-Thomson effects, compression heat, start-up and shutdown cases, and insulation condition may change the material and sealing review.
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.
Inconel 625 / UNS N06625
Nickel alloy benchmark for severe corrosion, seawater, and elevated-temperature review.
Super Duplex 2507 / UNS S32750
Super duplex benchmark for chloride-rich and seawater-related applications.
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 gas-service piping class, pressure class, facing, and gasket selection, 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 bore, schedule, end preparation, and fitting configuration 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.
NACE MR0175 / ISO 15156 Guide
Sour-service review and order-specific documentation control.
ASME B16.5 Flange Guide
Flange size, class, facing, and RFQ controls.
ASME B16.9 Fittings Guide
Buttwelding fitting dimensions and procurement controls.
PMI Testing Guide
Positive Material Identification planning and record 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
The ITP should clearly identify grade verification, certificate review, dimensional checks, marking, packing, and any purchaser or TPI hold points.
Order-specific testing
Specify required testing by the project and material standard, including any sour-service-related review, rather than expecting it from the component label.
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
Include the fluid description, water and sour-service information where relevant, piping class, material restrictions, documents, witness points, and delivery condition.
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.
Inconel 625 / UNS N06625
Nickel alloy benchmark for severe corrosion, seawater, and elevated-temperature review.
Super Duplex 2507 / UNS S32750
Super duplex benchmark for chloride-rich and seawater-related applications.
Stainless Steel 316L / UNS S31603
Low-carbon molybdenum-bearing stainless benchmark for controlled process service.
Engineering FAQs
Common gas processing 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 gas processing 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.
