Subscribe to our newsletter to receive the latest news and events from TWI:

Subscribe >
Skip to content

Project saves time and money for Amerada Hess

Back to Pre-1998 Articles Adhesive technology demonstration centre Aged samples lend added credence to safety codes Arc welding Demonstration Centre shows best practice in action Boiler takes the heat in comfort Conductive adhesive for ultrasound catheter cracking-risk-in-steel-pipelines-from-external-hard-zones Engineering critical assessment of pipeline welds Far East fitness-for-purpose check First UK Research Council contract for TWI Friction stir welding of titanium Help with adhesives training Joining demonstration centres in industry Joining Forces success in Belfast Joints take 10 seconds in the microwave LIVEMAN - Advanced joining processes for lightweight vehicle manufacture Making calculations easier 'Mildly sour' environment project saves half a million pounds New standard for weld fracture toughness testing Novel method joins plastic pipes Plastics fume - new findings released Project saves time and money for Amerada Hess Small firms seize no-cost reviews and low-cost trials South East Asia ACFM course Space Shuttle technology transferred to power generation industry Spot the evidence Structural integrity assured for Liverpool Bay Supporting technology on the Indian sub-continent Technology demonstrators show best practice in action Thermomechanical material processing by friction [friction pillar processing] 'Tubestress' measures residual stresses in parts that other equipment cannot reach TWI enhances on-stream inspection service Underwater welding work expands at TWI North Wider recognition for welding inspectors

Project saves time and money for Amerada Hess

Connect, no.79, September 1996

Using results obtained to date from their membership of a two year TWI Group Sponsored Project looking at the corrosion resistance of welded duplex and super duplex stainless steels in sour service, offshore development company Amerada Hess has made considerable savings on both capital investment and lead times for its latest project.

Currently, no reliable data exist for using welds in environments containing hydrogen sulphide (H2S), and materials properties limits set for parent materials are thought to be insufficiently conservative.

The project, now in its second year, investigated two types of duplex (22%Cr) and two types of super duplex (25% Cr) stainless steel using a range of welding processes. In addition, some of the welds tested deliberately contained intermetallic phases which have caused concern with corrosion in the past. Four-point bend tests were performed in autoclaves with differing levels of H2S, chloride and pH.

Initial results show that although super duplex stainless steel is more resistant to severe corrosive media than duplex, for many applications the 22%Cr material is perfectly acceptable.

Following these findings, Amerada Hess substituted duplex stainless steel for super duplex. This saved them money not only by using a cheaper material but also because they were able to receive the material early, rather than wait for the super duplex to be produced. The result was that their operation came on stream earlier than anticipated. Call Paul Woollin for further information on the Group Sponsored Project.

For more information please email: