50 mm Grade 3 Electric Anchor Windlass | Single Gypsy, Single Drum & Warping Head

50 mm Grade 3 Electric Anchor Windlass | Single Gypsy, Single Drum & Warping Head

Product Overview

The 50 mm Grade 3 electric anchor windlass is a horizontal-shaft shipboard anchoring machine designed to pay out, recover and control stud-link anchor chain through a single cable lifter (gypsy). The supplied arrangement combines one cable lifter with a single rope drum and a warping head on one deck-machinery foundation. Anchoring remains the primary duty; the rope drum and warping head should be specified separately if they are required to perform formal mooring-winch or auxiliary rope-handling functions.

The source model family covers 50, 52 and 54 mm IACS Grade 3 chain. Final selection is not based on chain diameter alone: the certified chain grade and link geometry, anchor mass, maximum anchorage depth, chain-stopper arrangement, brake holding basis, electric supply, control philosophy, deck layout, foundation reactions and classification requirements must be confirmed before the motor, gearbox, cable lifter and brake arrangement are approved.

Quick Specifications

• Anchor chain family: 50 / 52 / 54 mm IACS Grade 3 → the cable-lifter pockets must match the certified stud-link chain dimensions and tolerances.
• Grade 3 continuous working-load reference: 118.8 / 128.4 / 138.5 kN → based on the Grade 3 windlass duty basis for ordinary stockless anchors and anchorage depth up to 82.5 m; final class rules govern.
• Reference brake holding with a separate chain stopper: 882 / 950 / 1,022 kN → based on 45% of Grade 3 chain minimum breaking load; a different basis applies where no separate chain stopper is fitted.
• Anchor-chain speed: ≥9 m/min → corresponds to the 0.15 m/s reference hoisting speed used in current IACS windlass requirements under the specified test condition.
• Warping load: 50 kN → auxiliary rope-handling value from the supplied product series; it is not the anchor-chain working load, rope MBL or drum brake holding load.
• Configuration: Single gypsy + single rope drum + warping head → drum storage / mooring duty, rope capacity and drum brake requirements must be confirmed separately.
• Electric drive: Source catalogue motor notation 30 / 30 / 22 kW → exact speed-stage rating, motor duty, voltage, frequency, starting method and enclosure require project confirmation.
• Design basis: ISO 4568:2021 plus applicable flag-state and classification rules → ISO 3730:2012 additionally applies when the rope drum is specified as a mooring winch.

Main Technical Parameters

Standard-based Grade 3 selection values for the 50 / 52 / 54 mm model family are shown below. These values are for product selection and website reference; the final approved data sheet must follow the selected class rules, chain certificate and project arrangement.

Selection & Inquiry Guide

Step 1: Confirm 50 mm Grade 3 as the primary selection, or 52 / 54 mm if applicable, and provide the anchor-chain certificate or drawing showing chain standard, pitch, link proportions and tolerances.

Step 2: Confirm anchor mass, chain length, maximum anchorage depth, required continuous working load, short-term / overload duty, brake holding requirement, and whether a separate chain stopper is installed.

Step 3: Define the single rope drum duty: storage only or active mooring; provide rope construction, diameter, length, required drum pull / speed, working-layer basis and drum brake requirement. Confirm the 50 kN warping-head duty separately.

Step 4: Provide ship electrical data: voltage, frequency, motor duty, starting method or VFD requirement, enclosure / IP protection, space-heater requirement, and local / remote control philosophy including emergency stops and interlocks.

Step 5: Provide deck and anchor-arrangement drawings showing chain lead, hawse pipe, spurling pipe / chain locker interface, machinery handedness, foundation footprint, maintenance clearance and available deck reinforcement.

Step 6: Confirm classification society, FAT / witnessed test scope, documentation and coating requirements, quantity, delivery destination and required delivery date.

Structure

Electric motor | Reduction gearbox | Single cable lifter / gypsy | Cable-lifter brake and clutch as specified | Single rope drum | Warping head / warping end | Main shaft and bearings | Base frame | Local controls | Remote-control interface when specified

Anchor Handling, Brake & Drive Engineering

• The cable lifter must be matched to the exact Grade 3 stud-link chain geometry, not only the nominal diameter. Chain pitch, link width, stud geometry and manufacturing tolerances affect pocket engagement and wear.
• Windlass working load and brake holding load are different engineering values. The working load is the continuous anchoring pull from the drive system, while the holding load is the static load resisted by the cable-lifter brake under the approved securing arrangement.
• The brake, clutch and chain stopper perform different functions. Where a separate chain stopper is fitted, the windlass brake basis may be lower than for a windlass required to hold the chain without a stopper; the final arrangement must follow class approval.
• Electric motor and gearbox selection should be checked against continuous pull, short-term overload pull, chain speed, starting torque, transmission efficiency and operating duty. The source 30 / 30 / 22 kW notation should not be treated as a universal fixed rating without the motor datasheet.
• The single rope drum does not automatically make every unit a certified mooring winch. If the drum is used to manoeuvre, hold and store a mooring rope, its pull, speed, capacity, brake and applicable ISO 3730 / class requirements must be specified separately.
• Foundation design should account for anchor-chain forces, brake reactions, machine torque, rope-drum loads where applicable and local deck structure. Foundation reactions and bolt / weld details should come from the approved maker GA and vessel structural design.
• Factory acceptance and class witnessing can be arranged according to the approved inspection plan. Functional running, speed, load, brake, clutch, electrical and documentation checks should follow the project standard and agreed class scope.

Custom Attributes

• Product Type: Electric marine anchor windlass → horizontal-shaft anchoring machine with one cable lifter, one rope drum and warping head.
• Anchor Chain: 50 mm Grade 3 primary size; 52 / 54 mm within the source family → final cable-lifter geometry requires the certified chain drawing.
• Working Load: 118.8 kN for 50 mm Grade 3 reference duty → 128.4 / 138.5 kN for 52 / 54 mm Grade 3 in the same standard-based selection family.
• Brake Holding Basis: 45% of Grade 3 chain MBL with separate chain stopper as reference → 80% basis applies where the windlass brake is required to hold without a separate stopper, subject to class rules.
• Warping Duty: 50 kN source value → auxiliary rope handling only; do not use this value as rope MBL, line SWL or drum brake holding load.
• Electric Drive: 30 / 30 / 22 kW source catalogue notation → exact multi-speed rating, duty, voltage and starting arrangement to be confirmed.
• Control: Project-specific → local control is expected for machinery operation; remote control, interlocks and emergency-stop arrangement are to be confirmed before quotation.
• Certificate Requirement: According to project requirement and subject to class approval → certificate type, survey points, FAT scope and documentation must be agreed before manufacture.

How It Works

Electric motor drives the reduction gearbox → Selected clutch connects the cable lifter / specified rope-handling element → Cable lifter heaves or pays out the anchor chain → Brake controls and holds the chain within the approved holding basis → Separate chain stopper secures the anchor chain when fitted → Rope drum and warping head handle rope only within their separately specified duty

Applications

Bulk carriers | General cargo vessels | Tankers | Container vessels | Other sea-going commercial vessels requiring 50–54 mm Grade 3 anchor chain | Newbuilding anchoring systems | Windlass replacement and retrofit projects

Certifications & Advantages

Design review, material traceability, dimensional inspection, functional testing, agreed load / brake testing, electrical checks, coating inspection, FAT records and classification witnessing can be arranged according to the project requirement. Certificate availability depends on the agreed inspection scope and remains subject to the selected classification society’s approval procedure.

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

Drawing & Photos

FAQ

Q1: Why are the Grade 3 working load and brake holding load different?

A1: The windlass working load is the continuous pull delivered by the drive system for anchoring duty, while the brake holding load is a static chain load resisted by the cable-lifter brake. The required holding basis also changes with the chain-stopper arrangement, so the two values must not be interchanged.

Q2: Does the single rope drum mean this unit is automatically a mooring winch?

A2: No. The drum may be included for rope storage or working duty, but a formal mooring-winch function must be specified by rope diameter and construction, storage length, drum pull, speed, working layer and brake holding requirement. When it is used as a mooring winch, ISO 3730 and the applicable class rules are additionally relevant.

Q3: What information is required before a firm quotation?

A3: Provide chain diameter and Grade 3 certificate / drawing, anchor mass, chain length and anchorage depth, chain-stopper arrangement, required working / overload / holding duties, rope-drum and warping-head requirements, ship electrical supply, control philosophy, GA / foundation drawing, class society, FAT scope, quantity, destination and required delivery date.