Technical Specifications

The Alwyn Area consists of the Alwyn North platforms, the Dunbar platform and a  series of subsea fields tied back to these installations.

Alwyn North consists of two platforms, North Alwyn A (NAA) and North Alwyn B (NAB), which are joined by a bridge.  NAA contains the drilling and accommodation facilities, while NAB contains processing facilities for both Alwyn and Dunbar.  The Alwyn Area basic infrastructure  is illustrated in Figure A. After processing, gas is exported into the Frigg UK pipeline via the TP1 platform at Frigg.  Oil is exported into the Brent System via Cormorant Alpha and onwards to the Sullom Voe Oil Terminal.

Alwyn has processing facilities for oil, gas and  water separation together with facilities for gas and water injection and power generation. Figure B shows an overview of its hydrocarbon processing facilities. These were designed to be able to accept third  party business.  To this end, spare risers exist and there are facilities to allow the tie-in of third party business for processing and export. 

In order for either the Alwyn or Dunbar platforms to process third party fluids, an acceptable specification would have to be developed following a detailed analysis of fluid composition in relation to processing capabilities.

Inlet hydrocarbon quality ranges will be considered on a case by case basis, in order that Alwyn platform facilities’ processing capabilities can be assessed with regard to redelivery of gas and stabilised crude.

General information on acceptable fluid qualities are defined in Table 1.