Habshan’s Sour-Service Pipeline Contract Pairs Carbon Steel With Alloy 825
A September 2026 welding award for ADNOC’s P5 Habshan project highlights how one sour-service pipeline can require two very different material systems. Qapqa will provide automatic welding services for approximately 20 kilometres of large-diameter pipe in the United Arab Emirates. The scope includes 48-inch carbon steel and 36-inch corrosion-resistant-alloy clad pipe. The published project details identify 23.83-millimetre wall carbon steel alongside API 5L X52 pipe clad with Alloy 825, using 9.7 millimetres of steel plus 3 millimetres of alloy. The contractor describes the work as a Habshan sour-service pipeline project. Sour service changes the failure question In environments containing wet hydrogen sulfide, ordinary strength calculations are not enough. Material hardness, microstructure, stress and environmental severity can combine to create cracking risks that are absent in sweet service. NACE Pipe should…









