01
Environment
Shell-and-tube, plate, air-cooled, condenser, heater, and cooler interfaces
RTI application authority
Alloy Components for Heat Exchanger Systems
Heat-exchanger packages make material decisions at the intersection of two fluids, thermal gradients, pressure boundaries, nozzle connections, maintenance access, and documentation requirements. RTI helps buyers organize flanges and fittings around the approved exchanger and piping data, including the fluid side, material callout, pressure class, facing, dimensions, inspection scope, and release documents.
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 | Shell-and-tube, plate, air-cooled, condenser, heater, and cooler interfaces | - |
| Corrosion focus | Different process and utility media can create distinct corrosion risks across channels, nozzles, piping, stagnant areas, deposits, and cleaning cycles. | - |
| Temperature consideration | Tube-side and shell-side temperatures, thermal gradients, cycling, expansion, cleaning, and upset conditions should be identified against each connected component. | - |
| Pressure and containment | Side-specific design pressure, flange class, nozzle connection, gasket, bolting, bore, and piping standard must be reconciled to the exchanger datasheet and drawings. | - |
| Common component route | exchanger nozzle and piping connection standard, facing, gasket, and pressure class / flow direction, schedule or bore, reducer or elbow geometry, and weld preparation | - |
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
Thermal-service envelope
02
Corrosion
Different process and utility media can create distinct corrosion risks across channels, nozzles, piping, stagnant areas, deposits, and cleaning cycles.
03
Temperature
Tube-side and shell-side temperatures, thermal gradients, cycling, expansion, cleaning, and upset conditions should be identified against each connected component.
04
Pressure
Side-specific design pressure, flange class, nozzle connection, gasket, bolting, bore, and piping standard must be reconciled to the exchanger datasheet and drawings.
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
Different process and utility media can create distinct corrosion risks across channels, nozzles, piping, stagnant areas, deposits, and cleaning cycles.
Temperature changes the decision
Tube-side and shell-side temperatures, thermal gradients, cycling, expansion, cleaning, and upset conditions should be identified against each connected component.
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.
Stainless Steel 316L / UNS S31603
Low-carbon molybdenum-bearing stainless benchmark for controlled process service.
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.
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 exchanger nozzle and piping connection standard, facing, gasket, and pressure class, 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 flow direction, schedule or bore, reducer or elbow geometry, and weld preparation 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.
Flange Pressure Classes Explained
Class designation must be reconciled with material and temperature.
Pipe Schedule Explained
Wall thickness, bore, and fit-up 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
Define certificate reconciliation, PMI when required, dimensional check, flange-facing protection, packing, drawing review, and any exchanger-package document interface.
Order-specific testing
Keep component testing aligned with the component product standard and the approved exchanger or piping project requirements; do not combine shell-side and tube-side requirements by assumption.
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
Reference exchanger tag, datasheet or drawing revision, nozzle or line connection, material, class, facing, bore, documents, packing, and required delivery date.
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.
Stainless Steel 316L / UNS S31603
Low-carbon molybdenum-bearing stainless benchmark for controlled process service.
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.
Engineering FAQs
Common heat exchangers 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 heat exchangers 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.
