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Cyprus
Cyprus BaroMar — DN2500 Spiral Pipe for Underwater Compressed-Air Energy Storage
Project at a glance
Location
Cyprus — BaroMar underwater compressed-air energy storage (CAES)
Product
Spiral-welded steel pipe used as storage-tank bodies, S355J2 to EN 10025-2
Size
DN2500, with a flange welded at one end and a blind plate at the other
Volume
Several hundred pieces in total; first batch several dozen
Fabrication
Every unit made to the project drawings, not to a catalogue size
Inspection
SGS third party — dimensional check, 100% RT and UT of spiral and assembly welds, acceptance report issued
Year
2026
What is unusual about this order
The pipe is not a pipeline — it is the pressure boundary of an energy-storage vessel that will sit underwater. Each body is closed at both ends by a welded flange and blind plate, so the spiral seam and the two assembly welds become the critical joints. That changes the inspection regime completely: every one of those welds is radiographed and ultrasonically tested, not sampled.
Large-diameter body with welded bracing, before final closure welding
Third-party inspection, witnessed end to end
The owner’s CTO and project engineers followed the work through the shop, and SGS carried out the third-party inspection — dimensional measurement plus 100% radiographic and ultrasonic testing of the spiral seam and the assembly welds — before issuing the acceptance report. Nothing was shipped on our own word alone.
Why a fabricator, not just a mill
Drawing-driven — flange orientation, blind-plate fit-up and overall length are project-specific, so the shop works from the client’s drawings.
Weld quality over tonnage — for a pressure boundary, procedure qualification and full volumetric testing matter more than output per shift.
Traceability — heat numbers carried from plate to finished body, so SGS could audit any unit against its test records.
