SEA TOOLS

Grain Stability Check

Worksheet-style check against IMO Grain Code Part A §7 criteria using your booklet KN curve and VHM data.

How to use

Enter displacement, KG, FSM and KM from the loading condition.
Paste or type the KN curve (11 values for 0°–60° heel) from the grain booklet.
Set each hold state (filled/full or partly filled) and VHM from the stability booklet. Leave VHM blank to omit a hold.
Optional: enter allowable heeling moment table rows from the booklet.
Scroll to the result panel (on mobile, use the sticky View result bar) to see PASS/FAIL against your θf and θde limits.

Example values — edit any field.

Ship condition

Displacement (t)KG (solid) (m)Σ free-surface moments (t·m)KM at displacement (m)Stowage factor (m³/t)Flooding angle θf (°)Deck-edge angle θde (°)

KN curve

KN at 55000 t

Angles (°): 0, 5, 10, 12, 15, 20, 25, 30, 40, 50, 60

0°5°10°12°15°20°25°30°40°50°60°

Holds

Cargo holds

Booklet VHMs already include vertical-shift factors (1.06 filled / 1.12 partly)

Allowable HM table

Allowable HM — KG rows (m)Allowable HM — values (t·m)

PASS — all criteria met

Angle of heelPASS7.22° · limit ≤ 12.00°
Residual area (GZ − λ)PASS0.2449 m·rad · limit ≥ 0.075 m·rad · Integrated to 40.00° (40° limit)
GM₀ (fluid)PASS1.5600 m · limit ≥ 0.30 m
Grain heeling moment vs tablePASS11217.69 t·m · limit ≤ 17920 t·m

Calculation detail

KG (fluid): 8.7400 m
GM₀ (fluid): 1.5600 m
Grain heeling moment: 11217.69 t·m
λ₀ / λ₄₀: 0.2040 / 0.1632 m
Angle of heel: 7.22° (limit ≤ 12.00°)
Residual area to limiting angle: 0.2449 m·rad · Integrated to 40.00° (40° limit)
Allowable HM at KG fluid: 17920 t·m

Check against your ship's approved Grain Loading Manual and stability booklet. Not a replacement for approved software.