Pneumatic Accommodation Ladder Winch | ISO 7364 Split Drum, 10–20 kN

Product Specification

Pneumatic Accommodation Ladder Winch | ISO 7364 Split Drum, 10–20 kN

Product Overview

This pneumatic split-drum winch is intended for lowering, hoisting, and stowing a ship accommodation ladder. ISO 7364:2016 applies specifically to accommodation ladder winches, so the product is described here as an accommodation ladder winch rather than a pilot ladder winch. The split drum arrangement is used where two suspension wire ropes are wound on one drum, keeping the two rope paths separated while they are operated together.

The supplied product data confirms pneumatic-drive configurations with 10 kN, 16 kN, and 20 kN drum load, local control, and manual backup operation. The wider 5–30 kN values belong to the ISO 7364 nominal-size series and should not be presented as the confirmed supply range of this pneumatic model unless the selected configuration is verified. Hazardous-area or explosion-protection suitability of the pneumatic motor and control components is project-specific and should be confirmed separately, because ISO 7364 does not specify requirements for the prime mover.

Quick Specifications

• Standard: ISO 7364:2016 → international reference for the design and testing of ship accommodation ladder winches.

• Drive / drum arrangement: Pneumatic drive + split drum → suitable where two accommodation-ladder suspension ropes are wound on one drum.

• Confirmed product drum loads: 10 / 16 / 20 kN → select the model from the ladder arrangement, rope loading, and approved vessel design.

• Corresponding ISO holding loads: 30 / 48 / 60 kN → holding load is a static winch rating and is not interchangeable with drum load.

• Hoisting speed: 9–15 m/min in the supplied product data → the selected model and final rated speed should be confirmed on the approved technical sheet.

• Wire-rope basis: 6 × 37 galvanized steel wire rope with fibre core is the ISO design reference → actual rope diameter and minimum breaking strength depend on selected load and approval requirement.

• Safety functions: holding device, local emergency stop, and manual drive → key operating provisions for powered accommodation ladder winches.

• Testing: no-load, drum-load, overload, emergency-stop, and static holding-load tests → final test and certificate scope follows project and class requirements.

Load & Rope Selection Basis

ISO 7364 uses nominal size as the designation corresponding to drum load. The holding load is at least three times the drum load. For winches working with two ropes, the tabulated load values are the sum of the forces in both ropes. The selected wire rope must have adequate minimum breaking strength relative to the actual holding load; the standard performance table uses a five-times holding-load basis. Drum load, holding load, rope breaking strength, and test load therefore need to remain separate in quotation and approval documents.

Main Technical Parameters

Main webpage selection data for the confirmed 10 kN, 16 kN, and 20 kN pneumatic split-drum configurations. Loads are in kN unless otherwise stated.

Note: The ISO series also includes nominal sizes 5, 6, 8, 12, 25, and 30. Those sizes are retained in the Backend Engineering Reference as standard-series data, not as confirmed pneumatic product models. Values in brackets in the ISO table relate to national-standard rope diameter specifications.

16 kN Pneumatic Drive Reference Configuration

The following data comes from the supplied 16 kN reference configuration. It should be confirmed against the final maker drawing and motor data sheet before quotation or class submission.

Selection & Inquiry Guide

Step 1: Confirm that the equipment is for a ship accommodation ladder and provide the ladder GA, stowed position, suspension-rope arrangement, and whether the ladder is single-flight or double-flight.

Step 2: Select drum load 10 / 16 / 20 kN according to the approved ladder load calculation and installation arrangement; verify the corresponding holding load and rope load basis.

Step 3: Confirm split-drum rope details: number of ropes, rope construction, diameter, minimum breaking strength, required rope length / drum capacity, and rope exit direction.

Step 4: Confirm pneumatic supply conditions: available working pressure, air-flow capacity, control arrangement, and any hazardous-area / explosion-protection requirement for the motor and control components.

Step 5: Confirm right-hand or left-hand drive arrangement, deck foundation / fastening interface, local emergency stop, manual operation, and available maintenance space.

Step 6: Provide classification society requirement, inspection / certificate scope, quantity, surface treatment, delivery destination, required delivery time, and approved drawing or reference photo if available.

Structure & Functional Components

Pneumatic motor | Reduction gearbox | Split drum | Wire-rope system | Holding / braking device | Manual drive | Local control valve and emergency stop | Base frame | Lubricated bearings and rotating parts

Design, Operation & Safety Requirements

• Split-drum function → where two ropes are wound on one drum, the drum is divided so the two rope paths remain separated and controlled.

• Rope winding geometry → ISO 7364 limits the effective working rope length to no more than three layers on the drum, while the total rope is to be accommodated within the standard layer limit.

• Drum and flange relationship → the standard links minimum drum diameter and flange projection to wire-rope diameter, helping control bending and rope retention.

• Holding function → the holding device is required to hold the drum under the specified static condition and, for powered winches, to act when the drive is shut off or power is lost.

• Manual backup → powered accommodation ladder winches are required to permit manual lowering and hoisting, with precautions against hazards from a revolving crank handle.

• Emergency stop → a local emergency stop is part of the standard operating requirements and is checked during the drum-load test sequence.

• Drive overload capability → the powered winch is tested for a short-duration overload relative to drum load; final FAT records should identify the actual tested model and load.

• System integration → on-board testing is performed as part of the complete accommodation ladder unit, so winch approval cannot be separated from rope routing, ladder arrangement, foundation, and vessel installation.

Pneumatic Drive & Project Confirmation

A pneumatic drive can be useful where the vessel already has a suitable compressed-air supply and where the project prefers to minimize electrical equipment at the winch location. However, pneumatic drive should not automatically be described as “explosion-proof.” The motor, valve, local control, materials, operating temperature, and hazardous-area suitability must be confirmed from the selected component certificates and vessel specification.

For the supplied 16 kN reference configuration, 0.59 MPa working pressure and 6 m³/min air consumption are listed. These are model-specific reference values rather than ISO requirements. The final air supply connection, pressure at the motor, allowable pressure drop, and control schematic should be confirmed on the maker-approved technical document.

Custom Attributes

Standard: ISO 7364:2016 → applies to ship accommodation ladder winches and their design / acceptance testing.

Drive Type: Pneumatic (P) → prime-mover specification is project-specific and is not defined by ISO 7364.

Drum Type: Split drum (DD) → used when two ropes are wound on the same drum.

Confirmed Drum Load: 10 / 16 / 20 kN → product configurations supported by the supplied technical listing.

Winch Hand: Right-hand or left-hand, to be confirmed → orientation is defined relative to the motor / power-supply side and should match the vessel GA.

Control: Local control → final valve layout, emergency stop, and operating direction should match the approved drawing.

Manual Drive: Required for powered winch arrangement → provides manual lowering / hoisting when powered operation is unavailable.

Material: Mild steel → material grade and traceability level should be confirmed in the order specification.

Surface Treatment: To be confirmed → coating system should match the vessel painting specification and installation environment.

Hazardous-Area Rating: To be confirmed → do not infer certified explosion protection solely from pneumatic drive.

Certificate Requirement: According to project requirement → class inspection, maker certificate, and component certificates should be defined before quotation.

How It Works

Compressed air drives the pneumatic motor → Reduction gearing rotates the split drum → Two suspension ropes are paid out or hauled in in a controlled path → Holding / brake device maintains the ladder position → Local emergency stop interrupts powered operation when required → Manual drive provides backup lowering or hoisting when powered operation is unavailable

Applications

Ship accommodation ladder systems | Merchant vessels | Cargo vessels | Tankers subject to approved project requirements | Newbuilding projects | Replacement / retrofit of accommodation ladder winches | Vessel access systems designed around ISO 5488 and ISO 7364

Certifications & Documentation

Certificates and inspection can be arranged according to project requirement, class approval scope, selected components, and witnessed test procedure. Certificate availability should be confirmed before quotation and should not be treated as standard supply for every order.

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

Drawing & Photos

FAQ

Q1: Is ISO 7364 a pilot ladder winch standard or an accommodation ladder winch standard?

A1: ISO 7364:2016 is the international standard for accommodation ladder winches. A product supplied to this standard should therefore be described and selected as an accommodation ladder winch. Pilot ladder arrangements are a different safety application and should not be implied by this standard alone.

Q2: How should the 10 kN, 16 kN, and 20 kN models be selected?

A2: Selection starts with the approved accommodation ladder arrangement and required drum load. The corresponding holding load is checked separately, followed by rope diameter, minimum breaking strength, drum capacity, rope exit direction, drive hand, foundation, and class requirement. The load terms should not be substituted for one another.

Q3: Does pneumatic drive mean the winch is automatically explosion-proof?

A3: No. Pneumatic drive can be suitable for projects that prefer non-electric actuation at the winch location, but hazardous-area suitability depends on the specific motor, valves, control components, materials, and certification. The selected component certificates and vessel hazardous-area specification should be confirmed before the page or quotation uses an explosion-proof claim.

• Structure drawing

• Installation layout

• Product photos