Type:
Oil
Facility:
Production
Water Depth:
128
Installed:
1987
meters
Block:
46268
Design:
Fixed steel
Sub Structure:
14700
Topsides Wgt:
19679
tonnes
tonnes
Intro
A fixed steel jacket processing and export platform in the Alwyn North twin-platform complex (Blocks 3/9a and 3/4a). Installed in 1985 and bridge-linked to NAA, NAB contains the main processing trains and export interfaces for the field’s oil and gas production.
Field
NAB processes hydrocarbons from Alwyn North’s Jurassic sandstone reservoirs and satellite fields. It forms the processing head in the Alwyn Area, separating crude, gas and water, and conditioning fluids for export to onshore terminals.
Facilities
NAB’s facilities concentrate on multiphase fluid handling: primary separation of oil, gas and water; second-stage separation and stabilisation; gas compression and dehydration to meet export specifications; and produced water treatment to regulatory discharge standards. The processing trains include separators, knockout drums, compressors, heat exchangers and metering systems. Export infrastructure includes connections to the Cormorant Alpha pipeline system for oil and to the Frigg UK Pipeline System for gas. Utility systems are integrated across the Alwyn twin-platform complex, with power generation (gas turbines), control systems (DCS/SCADA), emergency shutdown (ESD), fire and gas systems shared. NAB also supplies power, chemicals (corrosion inhibitors, methanol for hydrate control), and water injection support to subsea tie-backs from surrounding satellite fields (Dunbar, Ellon, Grant, Nuggets, etc.). Accommodation support is provided on NAA. Pipeline headers and manifolds manage tie-backs and export flows, enabling long field life.
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