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Anchor Handling Winch Pull, Brake Holding, Drum Capacity & Emergency Release Tool

Line Pull by Drum Layer, Brake Holding, Wire Capacity, Drive Duty, Stored Energy & 2026 SOLAS Emergency Release

Anchor Handling Winch Pull, Brake Holding, Drum Capacity & Emergency Release Tool

Screen an offshore anchor-handling winch at the drum layer where the operation actually occurs. Compare line demand with layer-adjusted pull and brake capacity, calculate usable wire storage, visualize pull loss as the drum fills, check emergency-release load margin, and in Advanced mode build operational load cases, drive-power duty, stored elastic energy, payout duty and 2026 SOLAS readiness.

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Need much more depth? Click Advanced above.Advanced adds load cases, drive power, emergency-release analysis and SOLAS readiness checks.

Simple Winch Screen

Ten inputs answer the core question: can the winch pull, hold and emergency-release the entered line load at the current drum fill, and is the entered wire length physically compatible with the drum?

kN at the critical operation point.
kN from the installed line certificate.
mm.
m of working line stored above the dead-wrap reserve.
m.
m.
m between usable flange limits.
kN from maker data.
kN at the first rope layer.
kN. Use the equipment-specific certified or verified capability.

Operational Load Builder

Build a screening tension from submerged anchor/load weight, suspended line weight, breakout resistance and bollard-pull interaction. This is a scalar planning model, not a catenary or vessel-stability analysis.

tonnes.
% of dry weight retained in water.
m used for suspended line weight screen.
kg/m.
% of dry line weight retained in water.
kN.
kN.
%.

Advanced Drum & Brake Assumptions

% of ideal side-by-side wraps. Planning assumption, not a class limit.
mm user-entered project / maker allowance.
% of MBL. 0 disables this project criterion.
% of selected basis.
kN, used only when Custom is selected.

Drive Power & Stored Energy

m/min.
kW.
% from prime input to line work.
MN. Use line-specific data.
m contributing to elastic-energy screen.

Emergency Release & Controlled Payout

% of critical line tension. User-entered project criterion, not a universal SOLAS percentage.
s from command to controlled response.
m/min equipment / arrangement limit.
% of line tension for dissipation-power screening.

Advanced Load-Case Register

Compare direct-tension cases at different drum fills. Labels are categorical so no vessel, field or project identifiers are needed.

Case typeLine tension kNLine stored mLine speed m/min

2026 SOLAS Readiness & Survey Context

Engineering screening only: This tool does not replace class-approved winch design, maker load curves, wire certification, anchor-handling stability analysis, catenary modeling, dynamic simulation, foundation analysis, brake tests, emergency-release tests, survey or operational risk assessment. Exact brake factors, design loads, release test loads, payout restrictions and line limits are class-, maker-, vessel- and project-specific.
2026 regulatory basis: SOLAS regulation II-1/3-13 entered into force on 1 January 2026 and covers anchor handling winch design / construction / installation, operation, inspection, testing and maintenance. MSC.1/Circ.1662 calls for safe and controlled emergency release under normal and dead-ship conditions, actuation at the main control station, protection against unintentional activation, consideration of wire payout-speed restrictions, clear emergency-release instructions, and inspection after a release. Current class implementation also includes annual and five-yearly examination / testing regimes. Use the vessel's recognized organization, approved manuals, maker data and current statutory guidance for the actual equipment. IMO 2026 rules · DNV anchor handling overview
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