OCIMF SPM Chain Stopper with Welded Foundation for Tanker Bow Mooring

OCIMF SPM Chain Stopper with Welded Foundation for Tanker Bow Mooring

Product Overview

The OCIMF-type single point mooring chain stopper is a welded bow-deck fitting used to secure the tanker-end chafe chain of an SPM mooring hawser. Installed in line with the bow fairlead and the approved mooring lead, it engages the designated chain link and transfers the mooring force through the stopper body, welded foundation, and reinforced vessel structure.

Two reference configurations are provided for nominal chain diameters 54-56 mm and 76-78 mm, with supplied reference SWL values of 100 t and 200 t. Chain link geometry, load direction, foundation type, deck reinforcement, material grade, welding details, test requirement, and certificate scope must be confirmed against the vessel mooring arrangement and the applicable project-approved OCIMF reference.

Quick Specifications

• Product type: SPM chafe chain stopper → secures the tanker-end chafe chain during single point mooring operations.
• Mounting arrangement: Welded deck installation → stopper alignment, foundation geometry, and bow-deck reinforcement must be checked together.
• Nominal chain range: 54-56 mm and 76-78 mm → final selection must also confirm chain link pitch, width, stud arrangement, and engagement geometry.
• Reference SWL: 100 t and 200 t → stated as stopper working load values from the supplied table, not chain MBL, test load, or breaking load.
• Reference overall length: 1,336 mm and 1,800 mm → affects deck footprint, handling, installation space, and replacement compatibility.
• Reference weight: 488 kg and 1,421 kg → useful for lifting planning, packing, transport, and shipyard installation preparation.
• Material options: Mild steel, C-Mn steel, high-tensile steel, or cast steel → final material and traceability scope are project-specific.
• Compliance and certification: Available according to project requirement → OCIMF reference, class review, inspection, and certificate scope must be confirmed before production.

Main Technical Parameters

Reference dimensions for the supplied OCIMF-type SPM chain stopper series. Dimensions are in mm and weight is in kg.

The table is for initial selection and quotation reference only. Final dimensions, link engagement, load direction, foundation interface, and approval requirements should be confirmed by project drawing.

Selection & Inquiry Guide

Step 1: Confirm the SPM mooring arrangement, tanker bow layout, applicable OCIMF reference, and required chain stopper quantity.

Step 2: Confirm nominal chafe chain diameter, complete chain link dimensions, chain grade, stud configuration, and the exact link position to be engaged.

Step 3: Confirm required SWL and clearly separate it from chain MBL, proof load, test load, and breaking load requirements.

Step 4: Provide bow fairlead position, chain lead direction, deck elevation, available footprint, welded foundation type, and vessel structural drawings.

Step 5: Confirm material grade, welding specification, NDT scope, coating system, material traceability, class society, and witness inspection requirement.

Step 6: Provide quantity, delivery destination, required delivery time, approved GA drawing, and existing equipment photos for replacement projects.

Structure

Chain engagement mechanism | Load-bearing stopper body | Welded mounting base | Optional project foundation | Pin / locking components to confirmed design | Deck structural interface | Project coating system

Mooring, Foundation & Quality Advantages

• The stopper is selected together with the chafe chain, because nominal chain diameter alone is not sufficient to confirm correct link engagement and seating.
• The load path should be continuous from the engaged chain link through the stopper body and welded base into the reinforced bow-deck structure.
• A welded mounting arrangement supports permanent integration with the vessel structure, but weld size, joint preparation, supporting members, and local reinforcement remain subject to the approved ship drawing.
• An optional base foundation can be developed for newbuilding or replacement interfaces when the existing deck geometry does not match the reference footprint.
• Material selection can be adapted to the project load level, fabrication route, weldability, low-temperature requirement, and class approval scope.
• Dimensional inspection, weld examination, functional engagement checks, NDT, and load testing can be arranged according to the agreed inspection and test plan; exact methods and acceptance criteria are to be confirmed.

Custom Attributes

• Equipment Category: Single point mooring equipment → intended for tanker bow SPM hawser and chafe chain arrangements, not general towing equipment.
• Reference Type: OCIMF type → final conformity depends on the specified OCIMF publication / edition, approved drawing, and project interpretation.
• Nominal Chain Diameter: 54-56 mm / 76-78 mm → chain link geometry must be submitted before final design release.
• Reference SWL: 100 t / 200 t → do not use these values as chain MBL, proof load, or breaking load.
• Installation: Welded mounting → deck reinforcement and welding details are vessel-specific.
• Foundation Option: Project-specific base foundation available → interface dimensions and load transfer arrangement require approval.
• Material: Mild steel / C-Mn steel / high-tensile steel / cast steel → exact grades and component allocation to be confirmed.
• Certificate Requirement: Available according to order scope → maker certificate, material certificate, class certificate, and witness inspection are not assumed as standard supply.

How It Works

SPM hawser approaches the tanker bow → Chafe chain passes through the bow fairlead → Designated chain link enters the chain stopper → Stopper mechanism engages and retains the link → Mooring load transfers through the welded foundation to the reinforced vessel structure → Chain is released only after the mooring load is controlled

Applications

Crude oil tankers | Product tankers | Shuttle tankers | FSO / FPSO offloading interfaces where specified | CALM buoy tanker mooring | Single point mooring terminals | Newbuilding and replacement projects

Certifications & Advantages

Certificates and inspection can be arranged according to project requirement, approved drawing, material traceability, class society procedure, and agreed inspection scope.

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

Drawing & Photos

FAQ

Q1: How should the 100 t and 200 t chain stopper sizes be selected?

A1: Start with the required stopper SWL and nominal chafe chain diameter, then verify the complete chain link geometry, fairlead alignment, deck footprint, foundation arrangement, and vessel-approved mooring drawing. Nominal diameter alone is not sufficient.

Q2: Does “OCIMF type” automatically confirm full OCIMF compliance?

A2: No. The applicable OCIMF publication and edition, vessel arrangement, chain specification, load basis, testing, and class approval scope must be stated in the project documents. The final product should be released against an approved drawing and agreed inspection plan.

Q3: What information is required before quotation?

A3: Provide the required SWL, chain diameter and full link dimensions, vessel type, bow fairlead and chain lead arrangement, foundation drawing, material and coating requirements, class society, test and NDT scope, quantity, destination, and delivery schedule.

Drawing of OCIMF Type Single Point Mooring Chain Stopper Ship Towing Equipment