The SPO Compact Flange System (SPO CFS) has for more than 10 years proven its ability to fulfil the most severe operational conditions in the North Sea. In view of the good experiences and desire for a wider market application for Compact Flanged Connections (CFC), an agreement for the right to use the patented SPO compact flange was negotiated between SPO and the two Norwegian oil companies, Statoil and Norsk Hydro, in 2001. The agreement also includes the right to establish a Norwegian petroleum industry NORSOK standard for CFC where the dimensional standard is based on the SPO compact flange design. The fact that this compact flange system fully comply with ASME codes and standards, also the ASME B 16.34 valve design standard, may create a significant market for this new standard. This paper describes the new NORSOK standard, which is expected to be published in 2002, and it outlines the advantages of the CFC and the field experience so far.

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