IACS CSR Compliance for Structural Drawings — What You Need to Know

The IACS Common Structural Rules (CSR) are the unified structural standards for bulk carriers and oil tankers, developed by the International Association of Classification Societies. They replaced the individual class society rules for these vessel types and are now mandatory for all IACS member societies — meaning any bulk carrier or tanker classed by DNV, Lloyd's Register, Bureau Veritas, ABS, NK, or any other IACS member must comply with CSR.

For naval architects and plan approval engineers, CSR compliance means verifying that every structural member in the vessel meets or exceeds the minimum scantling requirements defined by the rules. This involves calculating plate thickness, section modulus, moment of inertia, and other properties for each member, and comparing them against the rule-derived minimums.

What CSR covers

• Hull girder strength — longitudinal strength requirements for the vessel as a whole.
• Primary structure — requirements for double bottom, side shell, deck, and transverse bulkhead members.
• Local scantlings — minimum plate thickness and stiffener section modulus for each structural element.
• Fatigue strength — assessment of structural details subject to cyclic loading.
• Buckling — compressive strength requirements for plate panels and stiffened panels.
• Corrosion additions — prescribed corrosion margins for different structural zones.

The challenge of manual compliance checking

A single midship section drawing can contain hundreds of structural members. Checking each one against CSR requirements means extracting dimensions from the drawing, running the scantling calculation using the CSR formula, looking up the applicable corrosion addition, and documenting the result with the relevant rule clause reference. Done manually, this takes days per drawing — and errors are common.

How ShipWright AI automates CSR checks

ShipWright AI reads the structural drawing, identifies each member, and runs the full CSR scantling calculation automatically. It produces a structured report showing the rule-required minimum, the as-designed value, and the margin (PASS or FAIL) for every member, with the applicable CSR clause reference. The entire check takes minutes, not days.

Beyond CSR, ShipWright AI also supports DNV, ABS, Lloyd's Register, Bureau Veritas, and NK rules — so a single drawing can be verified against multiple rule sets in one session.

Try it free at shipwrightai.org.