One unique feature of EEMUA 158 is its requirement for permanent marking of critical flanges. After assembly and verification, the joint is typically marked with a unique ID number, the date of assembly, and the operator's ID stamp. This allows for instant traceability back to the Joint Integrity Dossier.

In practice, a project will often use EN 1591-1 for design calculations and EEMUA 158 for the assembly and verification requirements. You cannot separate them if you are working in the North Sea, Middle East LNG, or similar high-risk environments.

: Jacket structures (nodes, cones, braces, legs), piles, followers, J-tubes, and caissons.

," is a critical engineering document that defines the requirements for fabricating primary offshore installations. Originally developed for North Sea operations, it is now used globally as a consensus-based specification for cost-effective construction. Intertek Inform Key Features and Scope Primary Structural Coverage

The standard goes beyond simple visual checks. It specifies maximum allowable radial scratches, tool marks, and pitting on flange faces, often using comparator blocks. A damaged flange face is the number one cause of gasket failure, and EEMUA 158 provides the acceptance criteria to reject a flange before assembly begins.

October 26, 2023 Subject: Technical Summary and Scope of EEMUA Publication 158 Prepared For: Engineering/Management Review