Shipside Two-Roller Fairlead with Welded Seat | ISO 13767 for Ship Mooring

Product Specification

Shipside Two-Roller Fairlead with Welded Seat | ISO 13767 for Ship Mooring

Product Overview

The ISO 13767 shipside two-roller fairlead is a shipboard mooring fitting installed at a shell or bulwark opening to lead a mooring rope from the vessel inboard side to the outboard side. Two vertical rollers guide the rope through the shipside opening while the welded seat transfers the resulting load into the surrounding hull structure and under-deck reinforcement.

This page covers only the 2-roller configuration in ISO 13767:2020, with nominal roller outside diameters Dn from 150 mm to 500 mm. Selection should consider the rope lead direction, relative rope angle, reference SWL, shell or bulwark opening, roller maintenance clearance, seat welding detail, and approved towing and mooring plan. ISO 13767:2020 is the current second edition and replaces ISO 13767:2012.

Quick Specifications

• Product type: Shipside two-roller fairlead with welded seat → guides the mooring rope between the vessel inboard and outboard sides.
• Current standard: ISO 13767:2020, 2-roller type → the 2012 edition has been withdrawn and replaced by the technically revised 2020 edition.
• Nominal roller sizes: Dn 150 / 200 / 250 / 300 / 350 / 400 / 450 / 500 mm → the nominal size is based on the roller outside diameter.
• Reference SWL range: 26 to 195 t at θ = 90° and 19 to 140 t at θ = 20° → final onboard SWL depends on the actual rope loading condition and supporting structure.
• Seat material basis: Weldable steel plate with yield point not less than 235 N/mm² → material grade and traceability should be confirmed before production.
• Roller reference: Steel rollers according to ISO 13755 → roller construction, axle, bearing or bush arrangement, and material details should follow the approved drawing.
• Installation interface: Welded seat at the ship shell or bulwark opening → opening dimensions, roller overhauling space, weld detail, and reinforcement require drawing review.
• Surface requirement: Smooth rope-contact surfaces and external anti-corrosion protective finish → helps reduce rope abrasion and supports marine coating durability.

Main Technical Parameters

Selection & Inquiry Guide

Step 1: Confirm ISO 13767:2020 and the 2-roller configuration; do not combine this page with the separate 3-roller type.

Step 2: Select nominal size Dn and preliminary SWL according to the mooring rope tension, relative rope angle θ, and approved vessel towing and mooring plan.

Step 3: Confirm the shell or bulwark opening, rope lead direction, roller removal and maintenance clearance, and available installation space.

Step 4: Provide the seat welding detail, supporting steel arrangement, and under-deck reinforcement drawing. The actual onboard SWL shall account for the supporting structure and shall not exceed the standard reference value.

Step 5: Confirm seat material grade and roller construction. Cast steel, stainless steel, nodular cast iron, or special ice-class material options require separate drawing, material, strength, and approval confirmation.

Step 6: Confirm surface treatment, SWL marking, material traceability, maker certificate, class inspection scope, quantity, destination, and required delivery time.

Step 7: Provide the vessel type, installation position, classification society requirement, GA drawing, and existing product photos for replacement projects.

Structure

Two vertical steel rollers | Roller axles and bearing / bush arrangement | Welded steel seat | Shell or bulwark opening interface | Rope-contact surfaces | Supporting hull structure | Anti-corrosion protective finish

Roller, Installation & Engineering Advantages

• The two-roller arrangement provides a compact shipside rope path where the vessel layout requires vertical roller guidance without the additional central roller used in the 3-roller type.
• Rotating rollers reduce sliding contact between the rope and a fixed edge, helping limit abrasion when the rope direction changes through the shipside opening.
• The ISO size series from Dn 150 to Dn 500 supports selection across different rope tensions and vessel mooring arrangements while keeping the roller outside diameter as the nominal size reference.
• The shell or bulwark opening should allow sufficient overhauling space for roller removal and maintenance; the opening shall not be selected only from the external fairlead width.
• The welded seat and surrounding hull reinforcement form one load-transfer system. Weld detail, local plate thickness, stiffeners, and under-deck reinforcement should therefore be reviewed together.
• The actual onboard SWL is governed by the approved installation and rope loading condition and shall not exceed the standard reference SWL for the selected size and rope angle.
• ISO 13767:2020 adds technical information on finite element method assessment. FEM review can be provided according to project requirement but should not be presented as a default certificate.

Custom Attributes

• Standard: ISO 13767:2020 → current second edition for shipside roller fairleads.
• Configuration: 2-roller type → two vertical rollers on a welded shipside seat.
• Nominal Size: Dn 150 to Dn 500 → based on the roller outside diameter.
• Reference SWL: 19 to 195 t depending on Dn and rope angle → final marked SWL follows the approved loading and installation condition.
• Seat Material: Weldable steel plate, yield point ≥ 235 N/mm² → exact grade and certificate scope to be confirmed.
• Roller Standard: ISO 13755 → roller details should match the approved current-edition drawing.
• Installation: Ship shell / bulwark welded seat → opening, welds, support structure, and roller overhaul space require confirmation.
• Surface Treatment: Sa 2.5 blasting + epoxy shop primer as a supplier reference → final system follows the vessel coating specification.
• Certificate Requirement: Available according to order scope → class approval, witness inspection, and document package are subject to project agreement.

How It Works

Mooring rope approaches from the inboard side → Rope enters the shell or bulwark opening → Two rotating rollers guide the rope toward the outboard side → Roller reactions pass through the welded seat into the reinforced hull structure → Approved SWL and inspection requirements are recorded in the vessel towing and mooring plan

Applications

Shipside mooring stations | Bulwark or shell rope openings | Cargo ships | Bulk carriers | Tankers | Container vessels | Newbuilding projects | Replacement and retrofit projects | Towing lead positions only when specified in the approved vessel plan

Certifications & Advantages

Certificates and inspection can be arranged according to project requirement, material traceability, agreed inspection scope, and classification society approval procedure.

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

Drawing & Photos

FAQ

Q1: Should ISO 13767:2012 or ISO 13767:2020 be specified?

A1: ISO 13767:2020 is the current second edition and replaces the withdrawn 2012 edition. A replacement project may still refer to an older vessel drawing, but the applicable edition and dimensional compatibility should be agreed before production.

Q2: Can the standard SWL be used directly as the onboard marked SWL?

A2: No. The table values are reference limits related to nominal size and rope angle. The actual onboard SWL should consider the rope loading condition, welded seat, shell or bulwark structure, and under-deck reinforcement, and it shall not exceed the applicable standard value.

Q3: Is the complete ISO 13767 fairlead a cast steel product?

A3: The publicly available ISO 13767 material requirement identifies the seat as weldable steel plate and references ISO 13755 for steel rollers. Any cast steel, stainless steel, nodular cast iron, or special ice-class version should be confirmed against the actual roller drawing, strength assessment, material certificate, and approval requirement.