Steel Coil Loading, Tanktop Strength & Dunnage Tool | ShipUniverse
Steel Coil Stowage • Tanktop Capacity • Local Bearing • Dunnage Sizing • Coil Geometry • Securing Margin • Loading Plan

Steel Coil Loading, Tanktop Strength & Dunnage Tool

Screen a steel-coil stow against the vessel's approved hold and tanktop limits, calculate local load beneath dunnage, estimate the minimum dunnage support needed, cross-check declared coil mass from geometry, and flag securing, handling and stowage gaps before loading. Vessel-specific approved loading information and the Cargo Securing Manual always control.

Currency
Currency selector changes display only. No exchange-rate conversion is performed.

Vessel & Approved Structural Basis

Enter values from the approved loading manual, steel-coil loading plan, class-approved calculation or other vessel-specific structural documentation. There is no universal tanktop limit for steel coils.

t/m² over the effective stow footprint. Enter the vessel-specific approved value.
t/m². Use only where the vessel's approved structural data provides a local/coil loading basis.
t/m of loaded dunnage length. Enter class/yard/approved engineering limit if available.
tonnes.
m.
m.
%. Planning reserve only. It does not alter the class-approved limit.
Screening factor for unequal load sharing through lower-tier coils and dunnage. Use approved analysis where available.

Coil Geometry & Stow

tonnes.
mm.
mm.
mm along the coil axis.

Advanced Coil-Row Register

Model mixed coil sizes or different structural zones separately. Each row is checked against its own local and line-load limits. A failed row controls the vessel-level structural verdict.

Row / zoneBottom coilsUpper coilsCoil tOD mmID mmWidth mmDunnage linesBoard width mmBearing length mLocal limit t/m²Line limit t/m

Dunnage, Chocks & Load Spread

mm.
mm.
m. Do not assume the full timber length participates unless the approved load path supports that assumption.
MPa. Enter a verified timber/material value. This is not an IMO default.
mm.
m per board.
per m³.
%.
Use vessel/CSM/cargo-specific approved value for securing calculations.

Securing-Force Screen

This simplified force balance is a planning screen only. Enter design accelerations and effective securing capacities from the approved CSM or engineering analysis. It does not reproduce the complete CSS Code Annex 13 calculation.

tonnes represented by the securing group/end block.
g from approved CSM / voyage calculation.
g.
g used to reduce available friction in this screen.
kN after angle, CSM safety factors and connection limitations.
kN after all applicable reductions.

Handling, Stowage & Documentation

tonnes.
% above declared coil mass for this screen.

Dunnage / Rework Cost Exposure

per tonne, for exposure illustration only.
% used only for a claim-exposure illustration.
per day.
hours.
Engineering limitation: This is a screening and planning tool. It does not calculate the actual strength of tanktop plating, floors, girders, hopper structures, welds or foundations. It does not replace the ship's approved loading manual, Cargo Securing Manual, class-approved steel-coil loading plan, loading computer, naval architect, surveyor, stevedore plan or the Master's judgment. The dunnage load-spread model assumes the user-entered effective bearing length and concentration factor represent the real structural load path. Actual coil-to-timber contact, floor spacing, dunnage continuity, tier geometry, corrosion, local structure and cargo securing can materially change the result.
Regulatory / operating basis: SOLAS chapter VI requires cargoes other than solid and liquid bulk cargoes to be loaded, stowed and secured throughout the voyage in accordance with an Administration-approved Cargo Securing Manual. The IMO CSS Code provides the international stowage/securing framework and states that securing decisions should account for the severe weather expected on the intended voyage. Steel-coil tanktop capacity, local structural limits, dunnage arrangement and allowable securing loads remain vessel-specific. Practical steel-carriage guidance commonly recommends bottom stow, athwartship dunnage, fore-and-aft coil axes for conventional on-the-round stow, chocking/locking and avoidance of concentrated tanktop overload. Always follow the approved vessel-specific plan where it differs.
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