This NORSOK standard is developed to provide an industry standard for a CFC which is an alternative to conventional flanges as specified in ASME standards, European Standard and International Standard, with reduced weight and smaller overall dimensions. In addition leak tightness reliability is increased by its inherent design features and make up procedures. The CFC may also be an alternative to other types of clamp and hub type mechanical connectors.
The use of load carrying sealing elements, traditionally referred to as "gaskets", will normally violate the fundamental requirements of this NORSOK standard.
It is claimed that compliance with this NORSOK standard may involve the use of a patent concerning the product given in Clause 5. However, the holder of this patent right – Patent no. NO177160 – has accepted free use of the flange configurations within the application limits contained in Clause 5.
Experience from the first edition of this NORSOK standard has revealed a need of the following improvements, which have been incorporated into the second edition:
- Requirements in order to improve documentation of mechanical properties in 4.2.
- Nickel alloys added for flanges, see 5.6.1.
- More specific guidelines to alignment in 5.14.7 including shear force capacity of seal ring.
- Improved design of blind flange in A.3 in order to improve sealing with a rigid interface.
- Design of integral flanges in A.4 in order to make them more feasible with all type of valves and equipment nozzle designs.
- Orifice spacers for monitoring of flow rate have been added to Clause 5, see A.7.
- Reducing threaded flanges for instrument connections have been added to Clause 5, see A.8.
- An informative bibliography has been added.
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