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Case study – 8 inch stub

Integrity issue

A 8 inch stub (carbon steel) was suffering from external corrosion. The external corrosion was sufficiently severe that the remaining wall thickness would not provide sufficient strength to withstand the acting structural loads. It was proposed to use a FutureWrap Structural composite repair to reinstate the strength of the 8 inch stub.

Design

The design of the FutureWrap Structural repair was to replace the strength reduction due to loss of wall thickness.   The design parameters were; thickness of steel to be replaced 7 mm, temperature 30⁰C, design lifetime 10 years. The repair design resulted in a thickness of 12 mm (10 layers) of Futurewrap Structural Carbon/LT composite repair with an axial length of 290 mm.

Installation

The installation steps are shown in the photographs. The surface preparation was to Sa2.5. Full QA/QC measurements were made to demonstrate that the FutureWrap repair was applied in accordance with ISO 24817.

Summary

A 8 inch stub suffering external corrosion was repaired using FutureWrap Structural Carbon/LT composite repair.  The repair was completed within 3 days returning the strength of the stub to its original value.