JIS F 2030 Bulwark Mounted Chock For Single Point Mooring Ship Towing Equipment

Product Specification

Bulwark Mounted Single Point Mooring Chock | JIS F 2030 Type B Cast Steel Mooring Pipe

Product Overview

The JIS F 2030 Type B bulwark mounted single point mooring chock is a cast steel mooring pipe installed on the bow bulwark of vessels that use a single point mooring arrangement. It guides the mooring line or chafe chain through a controlled oval and inclined passage, helping reduce local wear where the line passes through the vessel’s bow structure.

This page is written for the Type B configuration with nominal sizes from 400 to 800. The product is normally selected together with the vessel SPM arrangement, bow fairlead / chain stopper layout, mooring line or chafe chain size, bulwark reinforcement, weld detail, coating system, and class inspection scope. The standard and project drawing should be checked before production because load basis, rope construction, and installation details are project-specific.

Quick Specifications

• Product type: Bulwark mounted single point mooring chock → guides SPM mooring line or chafe chain through the bow bulwark.
• Standard and type: JIS F 2030-1978 Type B → reference for Type B shape, dimensions, rope reference data, and calculated mass.
• Nominal size range: 400 / 500 / 600 / 700 / 800 → suitable for large bow mooring pipe arrangements where the vessel drawing specifies JIS F 2030.
• Reference rope range: wire rope 50–132 mm, manila rope 30–70 mm, nylon rope 80–120 mm → reference only and not a direct SWL, MBL, or test load.
• Calculated mass: 190–830 kg → useful for handling, packing, lifting arrangement during installation, and freight estimation.
• Installation form: bow bulwark welded structure → surrounding reinforcement, weld details, and line lead angle must be checked by the shipyard or design office.
• Manufacturing focus: cast steel body, smooth rope-contact radius, controlled oval opening, weld-zone preparation, and coating quality.
• Surface treatment: Sa 2.5 blasting + one layer epoxy shop primer as reference → final coating or polished stainless steel surface follows project specification.

Main Technical Parameters

Selection & Inquiry Guide

Step 1: Confirm JIS F 2030 Type B bulwark mounted single point mooring chock and nominal size 400 / 500 / 600 / 700 / 800 according to the vessel drawing.

Step 2: Confirm the single point mooring arrangement, bow location, rope or chafe chain route, and whether the project is for newbuilding or replacement.

Step 3: Confirm applicable line information: wire rope, manila rope, nylon rope, or chafe chain size, construction, MBL, expected line angle, and contact direction.

Step 4: Confirm bulwark opening, welded connection area, local reinforcement, installation clearance, and relationship with bow bitts, chain stopper, or other SPM equipment.

Step 5: Confirm material requirement: cast steel according to project requirement, casting stainless steel, or special steel for low-temperature / ice-class service if specified.

Step 6: Confirm surface treatment, coating system, inspection scope, material traceability, NDT requirement, class witnessing, quantity, destination, and required delivery time.

Structure

Cast steel mooring pipe body | Oval inclined rope opening | Smooth rope-contact radius | Bow bulwark welded interface | Local reinforcement area | Reference rope / chafe-chain passage | Shop primer or specified surface treatment

Casting, Rope Guidance & Installation Advantages

• The oval inclined opening is suitable for guiding the SPM line through the bow bulwark where the line direction is controlled by the vessel mooring arrangement.
• Smooth cast rope-contact surfaces help reduce sharp local contact and support better protection for wire rope, fibre rope, or chafe chain during mooring operation.
• The cast body should be controlled for dimensional accuracy, opening geometry, transition radius, and surface defects that may affect rope contact or inspection acceptance.
• The product is not a lifting fitting. It is a mooring guide component; any load approval should be based on the vessel arrangement, line load, weld design, and class review.
• The bow bulwark welded interface must be checked together with hull reinforcement, weld detail, and the actual lead direction of the SPM line.
• Material traceability, casting inspection, dimensional inspection, NDT, and class witnessing can be arranged according to the agreed project and approval scope.

Custom Attributes

• Standard: JIS F 2030-1978 → use when the vessel specification or drawing calls for JIS single point mooring pipe dimensions.
• Type: Type B → bow bulwark mounted arrangement for SPM rope or chafe-chain guidance.
• Nominal Size: 400 / 500 / 600 / 700 / 800 → select according to vessel drawing, line size, and installation space.
• Reference Rope Data: Wire rope / manila rope / nylon rope values are reference only → not to be used directly as SWL, MBL, or test load.
• Material: Casting C-Mn steel or casting stainless steel → exact grade and certificate scope should be confirmed before quotation.
• Surface Treatment: Sa 2.5 blasting + epoxy shop primer as reference → final coating follows vessel painting specification or customer requirement.
• Installation: Bow bulwark welded → opening, reinforcement, weld detail, and line lead angle must match the approved arrangement drawing.
• Certificate Requirement: Available according to order scope → maker certificate, material certificate, class certificate, NDT report, or witness inspection should be agreed before quotation.

How It Works

SPM line approaches the vessel bow → Line or chafe chain passes through the inclined mooring chock → Smooth cast contact radius guides the line path → Local contact force is transferred through the welded bulwark structure → Bow reinforcement, inspection, and final coating complete the installation

Applications

Tankers | Large vessels | Bow single point mooring arrangements | SPM mooring stations | Mooring pipe replacement | Newbuilding projects | Offshore loading / unloading terminal interface equipment

Certifications & Advantages

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

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

Drawing & Photos

FAQ

Q1: Is the reference rope diameter the SWL of the mooring chock?

A1: No. The wire rope, manila rope, and nylon rope values are reference rope sizes from the supplied table. They should not be written as SWL, MBL, breaking load, or test load without the approved vessel mooring calculation and class review.

Q2: Why is JIS F 2030 Type B normally installed at the bow bulwark?

A2: Type B is used as a bulwark-mounted mooring pipe for single point mooring arrangements. It guides the mooring line or chafe chain through the bow structure while helping reduce wear at the rope-contact area.

Q3: What information is needed before quotation?

A3: Confirm JIS F 2030 Type B, nominal size, rope or chafe-chain size, material grade, surface treatment, quantity, bow installation drawing, reinforcement requirement, certificate scope, delivery destination, and required delivery time.