IACS Common Structural Rules (CSR)

The IACS Common Structural Rules (CSR) are the harmonized scantling rules for bulk carriers and oil tankers of 90 m and over, in force in their harmonized form since 1 July 2015. They prescribe net-thickness scantlings, prescriptive and direct (finite-element) strength assessment, fatigue checks, and corrosion additions on one common basis across all IACS member societies, replacing the divergent society-specific rules that preceded them.