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IMO MSC.552(108) Compliance & New Grain Stability Software Update

The International Maritime Organization (IMO) has adopted significant amendments to the International Grain Code through Resolution MSC.552(108), which will take effect on 1 January 2026 and will be applicable to both new and existing ships.

The entry into force of IMO Resolution MSC.552(108) on January 1, 2026, marks a major change in bulk carrier operations. This amendment to the International Grain Code introduces a critical fourth loading condition that directly impacts stability management.
We offers a re-engineered Grain Stability Software solution to ensure your fleet remains compliant, leverages new operational flexibilities, and avoids port detentions.
Previously, the Grain Code recognized three loading conditions. The latest amendment introduces a fourth: "Specially suitable compartment, partly filled in way of the hatch opening, with ends untrimmed."
This allows you to omit time-consuming end-trimming, but it mandates new recalculations of grain heeling moments and updated curves in your vessel's Grain Loading Manual.
PAMS Pacific Admiralty Maritime Services IMO Resolution MSC.552(108)
This new condition applies to any 'specially suitable compartment' where the grain is not filled to the maximum extent within the hatch opening, but reaches a level at or above the bottom edge of the hatch end beams. In such cases, the grain surface outside the hatch perimeter typically remains at its natural angle of repose unless trimmed.
Previously, the applicable heeling moments for untrimmed voids at the ends were not clearly defined. The new amendment addresses this by requiring Grain Loading Manuals to include specific heeling moment values for this condition, thereby allowing for an exemption from trimming the ends.

Automated Calculations

Built-in logic for revised 30° natural angle of repose and the mandatory 1.12 safety factor for transverse heeling moments.

Dynamic Curve Generation

Instant generation of the new grain shift moment and volume curves required for your mandatory Stability Booklet Addendum.

Class Approval Support

We manage all technical documentation and support the submission to your Classification Society to ensure final certification.

PAMS Pacific Admiralty Maritime Services
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IMO MSC.552(108) – PAMS Blog
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IMO Resolution MSC.552(108) Compliance FAQ

New loading classification?

A "partly filled" scenario for "specially suitable" compartments where grain reaches the hatch end beams, but ends remain untrimmed.

Purpose of the amendment?

To increase operational efficiency and flexibility by reducing trimming requirements while maintaining strict international safety standards.

Technical requirements?

Surface assumes a 30° slope. Total heeling moment is calculated as 1.12x the transverse moment to account for vertical grain shift.

Cargo manual updates?

Yes. Grain stability manuals must include this new condition and require formal approval from your Classification Society.

Stability software updates?

Yes. Shipboard loading computers must be updated with the new grain criteria and calculation methods to ensure full compliance.

Still have questions? Speak with our Technical Team.

With a combined expertise of over 24 years as Marine Surveyors and Technical Superintendents, our team ensures every inspection meets the highest industry standards.

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