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High-Temperature Axial Metal Expansion Joint for Steam and Exhaust Pipelines
This datasheet covers axial metal expansion joints with multi-ply SS321 bellows for absorbing thermal expansion in high-temperature steam, exhaust, and hot gas pipelines.
| Parameter | Specification |
|---|---|
| Size Range | DN50 to DN2000 (2" to 80") |
| Pressure Rating | PN10 / PN16 / PN25 / PN40 / Class 150 / Class 300 |
| Bellows Material | SS321 (UNS S32100) multi-ply hydroformed bellows, 2 to 6 plies |
| End Connection Material | Carbon steel or SS321 flanges / weld ends |
| Temperature Range | -200°C to +600°C (SS321 limit) |
| Movement Capability | Axial: 20-200 mm (size and convolution count dependent) |
| End Connections | Flanged ASME B16.5 / BS EN 1092-1 or butt weld ends |
| Features | Multi-ply SS321 bellows, axial movement, internal liner, limit rods, external cover |
| Internal Liner | SS321 internal liner for high-velocity flow and particle-laden gas streams |
| Accessories | Limit rods, tie rods, external shroud, pre-compression tabs |
| Component | Material |
|---|---|
| Bellows | SS321 multi-ply hydroformed bellows, 2 to 6 plies, solution annealed, 100% dye-penetrant tested |
| End Pieces | Carbon steel or SS321 pipe sections with weld preparation or machined flange faces |
| Flanges | Carbon steel or SS321 slip-on, weld-neck, or lap-joint flanges per ASME B16.5 / BS EN 1092-1 |
| Internal Liner | SS321 thin-wall liner with drain holes and flow directional taper to prevent bellows erosion |
| Limit Rods | Carbon steel or SS321 threaded rods with double nuts and washers for unrestrained installations |
| External Cover | SS304 or carbon steel protective shroud for personnel protection and environmental shielding |
| Gaskets | Spiral-wound SS321 + graphite for flange connections (if flanged ends specified) |
| Test | Requirement |
|---|---|
| Test Standard | Hydrostatic 1.5x PN; helium leak test on bellows; fatigue cycle test on request |
| Certification | CE, PED, ISO 9001 |
| Standard | Description |
|---|---|
| Design Standard | ISO 10628 / BS 6129 / EJMA Standards |
The Metal Expansion Joint -- Axial Bellows SS321 is designed, manufactured, and tested in accordance with applicable API / ASME / BS / ISO international standards. Compliance documentation and Material Test Certificates (EN 10204 3.1) are provided with every order.
Standard construction is carbon steel, stainless steel (CF8 / CF8M), and special alloy grades. Alternative and upgraded grades -- Duplex, Super Duplex, Inconel, Monel, Hastelloy, and NACE MR0175 trims for sour service -- are available on request.
It is offered in a range of sizes as per the technical specification with standard ANSI / ASME pressure classes (PN ratings on request). End connections include flanged (RF / RTJ), butt-weld, socket-weld, and screwed ends as per specification.
Yes. Supreme Valves India is an established exporter of industrial valves to Saudi Arabia (KSA), the UAE, Qatar, Kuwait, Oman, Bahrain, and across the Gulf. We provide sea-worthy export packing, EN 10204 3.1 / 3.2 certification, certificate of origin, and support for SABER / SASO conformity on KSA shipments.
Every valve undergoes hydrostatic shell and seat testing per API 598 / ISO 5208. Documentation includes EN 10204 3.1 MTC (3.2 on request), NDT reports, and fire-safe (API 607) or NACE MR0175 certification where applicable. Third-party inspection by TÜV, SGS, Bureau Veritas, or Lloyd's Register can be arranged.
Order quantities are flexible -- from single units for stocked items to bulk volumes for project requirements. Lead time depends on size, material, and quantity; please contact our team with your specification for a firm delivery schedule and quotation.