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Integrated fluid system solution

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A CHALLENGE posed by the oil and gas industry has been met with a successful product development relationship between Sweden's Sandvik Materials Technology and Swagelok Company in the USA.

The result is a new, integrated fluid system solution using Sandvik'ssuper duplex stainless steel grade SAP 2507, that performs successfully in highly corrosive, chloride-containing environments, such as oil and gas exploration and production.

The system comprises Swagelok gaugeable super duplex tube and weld fittings, an autogenous orbital welding process for welding SAF 2507 alloy components using the Swagelok welding system and Sandvik SAF 2507 super duplex tubing.

The solution brings together Sandvik's materials expertise and Swagelok's fittings and welding expertise to create an integrated fluid system that solves an industry problem.

For the first time, there are tube fittings and a weld fitting system available for SAF 2507 super duplex applications that are easy to use and have proven reliability.

Swagelok and Sandvik initiated development of a SAF 2507 alloy product line in the second half of 1998.

At that time, major oil companies, who were using duplex austenitic/ferritic alloys in welded sub-sea and deepwater fluid systems for chemical injection and similar applications, were expressing the need for small-bore tubing systems that could perform in this environment.

Sandvik Steel and Swagelok addressed the challenge presented by the leading operators and developed an integrated solution based upon Sandvik's SAF 2507 alloy.

"The technical dialogue with end users during the development phase was key to the successful conclusion of the project," says Magnus Nystrom, applied solutions manager at Sandvik Steel.

“The SAF 2507 alloy integrated solution offers easier installation, better corrosion resistance and lower weight than conventional systems."

Developed and patented by Sandvik, SAF 2507 is a super duplex stainless steel alloy that offers numerous advantages over standard stainless grade AISI 316L and other conventional stainless steels.

It has superior strength, lower weight savings, increased corrosion resistance and the ability to operate at high pressures. The alloy has found acceptance in many chloride-containing environments.

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