24” Offshore Gas Export Pipeline Riser Repair

Two sections along a 24” nominal bore Gas Export Pipeline Riser on a Philippines offshore gas platform were found experiencing external corrosion under the passive fire protection. All repairs were critical as these risers could not be shut down, and pressures could not be reduced due to their offshore location. With the high design pressure of 2945 psi (203 bar), the risk was becoming a safety concern if too much of the wall was lost due to the external corrosion.