Dump caisson for seawater including steel support structure has been designed, fabricated and delivered to Alvheim field development project in 2006.

Dump caisson has an internal diameter of 1200 mm, a total length of 20 m and is manufactures from glass fibre reinforced epoxy.

The total column weight, including steel support structure, is 6,54 tons. The Installation was done by a single point lift operation from the column blind flange top with the 450mm seawater inlet pipe spool installed.


  • Pipe Material: Glass fibre reinforced epoxy (GRE)
  • Diameter: 1200 mm
  • Total Length: 20 m
  • Design pressure: 0 bar, atmospheric
  • Pipe series: CST 8
  • Electrical properties: Conductive
  • Connecting nozzles: 450 mm + 200 mm (vent) + 150 mm + 80 mm (drain)
  • Design temperature: -6°C –  60°C
  • Operating temperature: -4,9°C –  40°C
  • Total weight column: 2,15 tons
  • Total weight column inc. Structure: 6,54 tons
  • Design life span: 20 years

Project scope: Design, structural calculations, fabrication, electronic measurements, lifting analysis and installation procedure.

Read more about our GRE Pipe system from Future Pipe Industries here.