Åsgard Operational 28″ x 42″ Pig Development – Statoil

The 42″ Asgard Transport pipeline runs some 684km from Asgard B Platform to the landfall site at Kalstø, Rogaland, Norway. The ERB (Export Riser Base) consists of 28″ pipe with four 14″ risers from the platform. The 28″ pipe runs 500m and then expands to 42″.

The RFO (Ready For Operation) pig developed in 1999 was run from the land fall site to the receiver on the ERB, ie 684km of 42″ line reducing down to 28″ for the last 500m. The RFO pigging tasks involved waterfilling the pipeline for hydrotest and dewatering with a glycol train.

Therefore the pig needed to be able to: –

  • Reduce from 42″ to 28″, whilst keeping the dP to a minimum in the 28″ line;
  • Provide the best possible seal along the entire pipeline.

Based on this the Asgard RFO Pig was developed, using: –

  • FTL Seals Technology Limited suspension design which keeps the pig exactly on the centreline of the pipeline;
  • Normal disc type seals, but with Buckle inducers to allow the seals to fold up into the 28″ line. This was based on our previous work on upheaval buckling.

Note that the supporting function and the sealing function have been essentially separated here. This provided Statoil with an excellent dewatering run in the line with the lowest ever measured volume of water in glycol.

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