12.5–30 mm Hydraulic Anchor Windlass | Single Gypsy with Warping Head for Small Vessels

Product Overview

This compact hydraulic anchor windlass is a single-gypsy deck machine for anchor handling on small vessels, workboats, barges, and other installations where deck space is limited. The cable lifter (gypsy) is matched to the specified anchor-chain diameter and grade, while a single warping head provides auxiliary rope-handling capability. The windlass itself is hydraulically driven and can be supplied with an electric motor-driven hydraulic power unit (HPU) when required by the project.

Selection should be based on chain diameter and grade, anchor weight and anchoring depth, required continuous and short-term pull, brake / chain-stopper arrangement, deck foundation, hawse-pipe alignment, and classification requirement. The 12.5–30 mm range represents a product series; one gypsy is not universal for all chain sizes. Hydraulic pressure, flow, motor displacement, HPU power, brake capacity, and foundation loads are finalized for the selected model and approved arrangement.

Quick Specifications

• Chain size range: 12.5–30 mm Grade 2 anchor chain → each gypsy is matched to the specified chain diameter, grade, and link geometry rather than the full range.
• Continuous duty pull: approximately 6.6–38.3 kN standard reference → calculated from 42.5d² N for Grade 2 chain; final design values follow the selected model and class requirement.
• Short-term overload pull: approximately 10.0–57.4 kN standard reference → at least 1.5 times the continuous duty pull for anchor breakout duty.
• Brake holding load: approximately 41.5–231.4 kN reference with a separate chain stopper → based on the 45% chain-breaking-load criterion; a no-stopper arrangement requires a higher brake / foundation design basis.
• Mean hoisting speed: ≥9 m/min reference → equivalent to 0.15 m/s minimum mean chain speed under the applicable windlass performance basis.
• Configuration: Single gypsy + single warping head → anchor-chain handling with auxiliary rope handling in one compact deck unit.
• Drive system: Hydraulic motor with reduction gearing → HPU pressure, flow, motor displacement, and electric motor power are model-specific and selected to meet chain load and speed.
• Control and installation: Local hydraulic control with deck-mounted bedplate → remote / proportional control, chain stopper, foundation bolts, and deck reinforcement are confirmed according to project scope.

Main Technical Parameters

Grade 2 chain reference values for initial windlass selection. These are standard-based duty and brake reference values, not a substitute for the approved model calculation. Final chain stopper arrangement, anchoring depth, anchor weight, hydraulic system, and class requirement should be confirmed.

Selection & Inquiry Guide

Step 1: Confirm anchor-chain diameter, Grade 2 / project chain grade, stud-link dimensions, and chain certificate information. The gypsy pocket geometry must match the actual chain.

Step 2: Confirm anchor weight, chain length, anchoring depth, hawse-pipe / spurling-pipe arrangement, and required continuous and short-term pull.

Step 3: Confirm brake and chain-stopper arrangement, chain lead direction, deck foundation, available footprint, shaft / motor orientation, and whether the project is newbuilding or replacement.

Step 4: Confirm hydraulic power arrangement: dedicated electric-hydraulic HPU or connection to an existing hydraulic system, including available pressure, flow, power supply, control voltage, and control station requirement.

Step 5: Confirm warping-head requirement, including intended rope-handling duty and any required line pull / rope diameter. A warping head is not automatically equivalent to a rated mooring winch.

Step 6: Confirm classification society / flag requirement, certificate scope, inspection or witness testing, quantity, destination, required delivery time, and provide GA / deck arrangement drawings or reference photos when available.

Structure & Components

Deck bedplate | Hydraulic motor | Reduction gearbox | Single chain gypsy / cable lifter | Clutch | Band brake | Single warping head | Shaft and bearings | Local hydraulic control | Electric motor-driven HPU when included in supply

Hydraulic Drive, Brake & Installation Advantages

• Hydraulic drive provides high starting torque and smooth low-speed control for anchor handling; the motor and reduction ratio are selected around the required chain pull and hoisting speed rather than a single pressure / flow value for the whole series.
• The single-gypsy layout reduces machinery width and is suitable where one anchor chain is handled at the windlass station. Gypsy profile, pocket count, and chain engagement must match the specified anchor chain.
• A declutchable gypsy and mechanical brake allow the cable lifter to be disengaged from the drive and the chain to be controlled during paying out or holding, subject to the approved operating arrangement.
• Brake sizing must be coordinated with the chain stopper. With a separate chain stopper, the windlass brake reference is lower than for a no-stopper arrangement; this difference also affects bedplate and deck-foundation loads.
• The warping head can support auxiliary rope handling during deck operations. If a defined mooring-winch duty or rated mooring line pull is required, that function should be specified separately and checked against the applicable mooring-winch requirements.
• Deck integration should align the gypsy with the hawse pipe and chain locker / spurling pipe while maintaining service access to the brake, clutch, bearings, hydraulic motor, and piping.
• Acceptance testing, hydraulic leakage checks, functional tests, load / overload tests, brake holding tests, and class witnessing can be arranged according to the project specification and approval scope.

Custom Attributes

• Product Type: Hydraulic anchor windlass → compact powered anchor-handling machinery for a single anchor chain.
• Chain Range: 12.5 / 14 / 16 / 17.5 / 19 / 20.5 / 22 / 24 / 26 / 28 / 30 mm → select one chain size per gypsy according to the actual chain.
• Chain Grade Basis: Grade 2 → main webpage duty table uses the Grade 2 standard reference formula; other chain grades require recalculation.
• Configuration: Single gypsy + single warping head → combines anchor-chain handling with auxiliary rope handling in one deck machine.
• Drive: Hydraulic → supplied with or matched to an electric motor-driven HPU according to selected model and vessel power supply.
• Hydraulic Parameters: To be confirmed by model → pressure and flow must be matched to motor displacement, required pull, speed, and HPU design.
• Brake / Chain Stopper: Project-specific → confirm whether a separate chain stopper is fitted because the holding-load design basis changes.
• Control: Local manual hydraulic control as base concept → remote or proportional control can be discussed when required by the project.
• Reference Design Basis: ISO 4568:2021 and applicable classification rules → final contractual standard and approval basis to be confirmed.
• Installation: Deck-mounted bedplate → foundation bolts / weld details, deck reinforcement, chain lead, and service clearance follow the approved GA.

How It Works

Electric motor drives the hydraulic pump → HPU supplies pressure oil to the windlass hydraulic motor → reduction gearing turns the chain gypsy to heave or veer the anchor chain → clutch disconnects the gypsy when required → mechanical brake controls and holds the cable lifter → warping head provides auxiliary rope handling

Applications

Workboats | Barges | Small cargo and service vessels | Inland and coastal vessels subject to applicable rules | Compact foredeck anchoring stations | Newbuilding and replacement projects

Certifications & Advantages

Classification approval, inspection, and certificates can be arranged according to project requirement, selected model, test scope, material / component traceability, and class approval procedure. Certificate availability and witness points should be confirmed before quotation; they are not assumed to be included with every order.

Certification: CCS, NK, BV, ABS, DNV, LR, KR, IRS, RS, RINA, CRS, Makers Test Certificate.

Drawing & Photos

FAQ

Q1: Can one gypsy handle every chain size from 12.5 to 30 mm?

A1: No. The 12.5–30 mm figure is the series range. The gypsy / cable lifter is selected for a specific anchor-chain diameter, grade, and link geometry. For replacement projects, chain dimensions or a chain sample / drawing should be checked before confirming the gypsy.

Q2: Why does the required brake holding load depend on whether a chain stopper is fitted?

A2: The chain stopper shares the static holding function. A windlass installed with a separate stopper can use the lower class reference holding basis, while a windlass without a separate stopper requires a higher brake and supporting-structure basis. The arrangement must therefore be confirmed before brake and foundation selection.

Q3: What information is needed to size the hydraulic power unit and prepare a quotation?

A3: Provide chain diameter and grade, anchor weight, chain length / anchoring depth, required speed, chain-stopper arrangement, vessel power supply, available hydraulic pressure / flow if using an existing system, warping-head duty, class requirement, deck GA / foundation arrangement, quantity, delivery destination, and required delivery time.