Bolted repair of a corroded escape stair
ServiceCorroded steelwork repair
AssetFixed gas platform
RegionSouthern North Sea
Year2026
From our own model. New steel in orange.
Problem
Through-thickness corrosion at both connection zones had restricted the stair to emergency use. Welding offshore was not permitted.
What came in
Inspection data: UT readings, visual inspection and MPI results.
What we did
Assessed the degraded section from the inspection data, compared three repair options, and checked the existing and new members to AISC 360-22. The chosen repair is a bolted supplementary member, with all welding done onshore.
What went out
A concept and options report, a calculation sheet, fabrication drawings and a 3D model of the repair.
Codes
AISC 360-22, ISO 19902, ISO 19901-3, BS EN 1090-2.
Our part
Scope, condition assessment, options, calculations, model and detail design.
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