Anchor Load, Wire Tension, Drum-Layer Derating, Brake Holding, Drive Power, Stored Energy & 2026 SOLAS Emergency Release

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

Model the mechanical loads behind offshore anchor handling instead of comparing winches by first-layer pull alone. Estimate anchor and suspended-line load, add seabed breakout, bollard-pull interaction and dynamics, calculate line pull and brake holding at the actual loaded drum layer, estimate wire storage layer-by-layer, screen MBL utilization, size hydraulic or electric drive power, quantify elastic energy trapped in a loaded line, test emergency-release load and payout duty, compare operating cases, and flag the 2026 SOLAS anchor-handling examination and emergency-release readiness items.

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

Anchor-Handling Operation & Line

This tool covers winches used to install, arrange, shift or recover anchors of offshore units and subsea installations. It is separate from a ship's own anchoring windlass.

tonnes.
m.
% of dry weight retained in water.
mm.
kN.
kg/m.
% of dry line weight retained in water.
% of MBL. Project / class / owner criterion, not a universal SOLAS value.
MN, used only for stored elastic-energy screening.
m contributing to elastic energy.

Simple Critical Load Case

kN.
kN.
%.
kN. 0 = calculate from anchor + line + breakout + bollard interaction.
m. Drum layer changes pull and brake holding.

Advanced Anchor-Handling Load Case Register

Compare recovery, breakout, deployment and vessel-assist cases. Each case can use a different drum fill because outer-layer torque loss is often missed in winch comparisons.

Case Anchor t Depth m Breakout kN Bollard % Dynamic × Line on drum m Tension override kN

Drum Geometry, Line Pull & Brake Holding

m.
m.
m.
mm.
% of ideal wraps per layer.
kN.
kN.
% of MBL or design tension depending on selected criterion.
kN, used only for Custom.

Drive Power & Handling Speed

m/min at the critical load.
kW.
% from prime mover / hydraulic input to drum line work.
bar.
%.
V.
%.

Emergency Release & Controlled Payout

kN verified / certified release capability.
% project criterion. SOLAS requires safe controlled release but does not create one universal percentage here.
s from command to controlled release response.
m/min.
% of line tension used for dissipation-power screen.

2026 SOLAS Survey & Owner Cost Context

Selected currency/day.

Engineering & 2026 Compliance Readiness

Anchor-handling engineering screen only: This tool is not a class-approved winch design, wire-rope certification, dynamic anchor-handling analysis, vessel stability calculation, towline catenary model, hydrodynamic simulation, brake test, emergency-release test, structural foundation calculation or SOLAS survey. Seabed breakout, dynamic amplification, bollard-pull interaction, wire stiffness and brake criteria are highly operation-specific. Use the vessel's class rules, approved manuals, winch maker curves, line certificates and risk assessment for actual operations.
2026 regulatory basis: SOLAS Regulation II-1/3-13 and associated anchor-handling guidelines establish mandatory design / construction / installation, examination, testing, maintenance and operational requirements for anchor handling winches and associated equipment. The regime entered into force on 1 January 2026 and is distinct from equipment used for the ship's own anchors. Current class implementation also requires a safe, controlled emergency-release function under normal and dead-ship conditions, with controls and operating instructions addressing unintended activation and payout restrictions. Annual and five-year examination / testing are included in the new compliance regime. Exact design loads, brake factors, emergency-release test loads and component ratings remain class-, maker- and project-specific inputs in this calculator.
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