Duplex Stainless in Oil and Gas
Duplex Stainless in Oil and Gas
The oil and gas industry remains by far the largest user of duplex stainless steels. Standards such as Norsok and NACE (Appendix 1) provide detailed instructions for the selection of materials. They range from carbon steels, stainless steels (martensitic, austenitic, duplex, super austenitic) to nickel-base alloys depending upon pressure, temperature, chloride concentration and H2S content Duplex are generally used in an intermediate position between martensitics and super-austenitics / Ni-base alloys. Their high strength is an asset when it comes to high pressures at great depths.
As oil exploration offshore moved to greater depths, involving higher pressures and harsher environments, demands for higher corrosion resistance, particularly to chloride SCC, and higher mechanical properties emerged. They led to the development of super and hyper duplex grades that offer the lowest life-cycle- cost including that of the risk of a component failure. The latter is critical in subsea operations.
Besides the ancillary equipment (pumps, valves, fittings, filters) not listed in the table, armouring of umbilicals (for wear and damage resistance) and blast walls designed to contain fire and explosions on oil and gas platforms (see picture) are examples of other applications.
Oil and Gas service conditions are pushing materials to their limits in corrosion resistance, service temperatures, both high and low, and mechanical properties. The wide use of duplex stainless steels demonstrates their remarkable capabilities.
| Area | Application | Alloy |
| Topside | Process piping Process pumps Injection pumps Process valves Separator vessels Manifolds | 2205 / Superduplex |
| Seawater/ waste water piping Seawater pumps Seawater valves Seawater filter vessels | Superduplex | |
| Subsea | Flexibles | 2003 / 2205 |
| Flowlines Gathering lines Manifolds Valves Hub connectors | 2205 / Superduplex | |
| Risers | Superduplex | |
| Downhole | OCTG Wireline Valves | 2205 / Superduplex |
| Area | Application | Alloy |
| Refinery | Crude desalters | 2205 & Superduplex |
| Amine towers lean/rich H/Ex | 2205 | |
| Amine reclaimer units with caustic | 2205 | |
| Filter drums (at risk of SCC) | 2205 | |
| Fresh and brackish water coolers | 2205 | |
| Steam Cracker | Freshwater cooling towers/Coolers | 2101/2102/2205 |
| Dilution steam generators Spent caustic oxidation vessels/piping | 2205 | |
| 2205 & Superduplex | ||
| Coolers for acidic process condensate | 2205 & Superduplex | |
| Aromatics | Feed fraction tower airfins/piping/vessels Aromatics/HC separation units, reboilers, H/Ex tubing | 2205 |
| 2205 | ||
| Polymers | Polypropylene piping, drums, dust collectors, dryers and | 2205 |
| rotating equipment | ||
| Elastomer slurry tanks, vessels, piping and rotating equipment LLPDE extruder feed shafts | 2205 | |
| 2205 | ||
| LDPE co-polymer piping | 2205 | |
| Elastomer extruders barrels and screws | 2205 | |
| Intermediates and other fluids | Corrosive service with organic acids, sulfuric acid, nitric acid, phosphoric acid, caustic, carbonyls etc. at high temperature and pressure | 2205 |
| Intermediate storage tanks | 2101/2102 |
ShunFu Metal LTD CO
ShunFu Metal is a large oil and gas tube manufacturer and supplier. We are metal experts and have been providing quality customer service and products since 1998.
At Fushun Metal, we supply a wide range of metals for a variety of applications. Our products/stock includes: Piling Pipe, Line Pipe, Casing and Tubing, Drill Pipe, Sucker Rod, CRA Piping etc
Our steel tubes and pipes are available in a wide range of process including: cold drawn, cold rolled, hot rolled, polished, threaded, painted etc. We can cut metal to your exact specifications.
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