Bulwark-Mounted Cast Steel Panama Chock for Ship Mooring & Towing | DIN 81915:1998 Form A

Product Overview

The DIN 81915 Form A bulwark mounted mooring chock is a cast steel rope guide used on vessel bulwarks where mooring or towing lines need a defined closed passage and smooth rope-contact radius. It helps limit the rope position and reduce direct friction between the rope and the ship structure during berthing, shifting, harbour mooring, and towing-line arrangement where applicable.

This page is written for the Form A bulwark-mounted configuration based on the supplied DIN 81915 data. The page should not be treated as a lifting product page. Final material grade, weld interface, local bulwark reinforcement, surface treatment, and certificate scope should be confirmed according to the vessel drawing and project specification.

Quick Specifications

• Product type: Bulwark mounted Panama chock / closed mooring chock → guides mooring or towing lines through a controlled rope passage.
• Standard and form: DIN 81915 Form A → German standard reference for bulwark-mounted chock geometry and nominal size selection.
• Nominal size range: 1 / 2 / 3 / 5 / 8 / 12 / 20 / 32 → selected according to SWL, rope arrangement, installation space, and vessel drawing.
• SWL range from supplied data: 10 to 320 kN → used as the product selection load, not to be mixed with rope MBL, breaking load, proof load, or test load.
• Material options: casting C-Mn steel, casting stainless steel, and special steel for ice-class or project-specific requirements → final material grade should be confirmed before quotation.
• Weight range from supplied data: 16.5 to 840 kg depending on material reference and nominal size → useful for handling, packing, installation planning, and freight estimate.
• Surface treatment: Sa 2.5 blasting + one layer epoxy shop primer as reference → polished stainless steel or customized surface treatment can be discussed when specified.
• Manufacturing focus: smooth rope-contact radius, cast body soundness, edge dressing, bulwark mounting interface, dimensional control, and certificate scope confirmation.

Main Technical Parameters

Selection & Inquiry Guide

Step 1: Confirm DIN 81915 Form A bulwark mounted mooring chock and nominal size 1 / 2 / 3 / 5 / 8 / 12 / 20 / 32 according to vessel drawing.

Step 2: Confirm required SWL, mooring or towing line direction, rope type, rope diameter, and whether the chock is for newbuilding or replacement.

Step 3: Confirm bulwark mounting position, opening alignment, weld interface, surrounding hull reinforcement, and available installation space.

Step 4: Confirm material requirement: cast steel, casting stainless steel, special steel for ice-class use, or other specified material.

Step 5: Confirm surface treatment: Sa 2.5 blasting with epoxy shop primer, final paint system, polished stainless steel surface, or customized coating.

Step 6: Confirm certificate scope before quotation: maker certificate, material certificate, class certificate, witness inspection, or project-specific approval.

Step 7: Provide quantity, delivery destination, required delivery time, installation drawing, and reference photos if available.

Structure

Cast chock body | Closed rope passage | Smooth rope-contact radius | Bulwark mounting interface | Rounded rope guide opening | Cast surface finishing | Shop primer or specified surface treatment

Casting, Installation & Engineering Advantages

• Closed chock geometry helps keep the mooring or towing line within a defined rope path and reduces direct contact between the rope and bulwark edge.
• Smooth rope-contact radii should be dressed and checked after casting to reduce sharp local contact and help protect fibre rope or wire rope.
• Cast steel supply is suitable when the project requires a robust rope guide with defined shape, repeatable geometry, and project-specific inspection scope.
• The bulwark mounted arrangement should be reviewed together with local hull reinforcement, rope lead angle, weld detail, and shipyard installation procedure.
• The supplied SWL range provides a clear selection basis, but it should not be confused with rope MBL, rope breaking load, proof load, or test load.
• GGG and GS weight references in the supplied table should be kept separate. For cast steel quotation, the final material grade and weight reference should be confirmed.
• FEA-based review, casting inspection, NDT scope, or class witness inspection can be arranged when required by the vessel specification or class approval procedure.

Custom Attributes

• Standard: DIN 81915:1998-08 → use when the shipyard or owner specification requires DIN bulwark or deck-mounted mooring chock dimensions.
• Form: Form A → bulwark mounted closed chock configuration for mooring and towing line guidance.
• Nominal Size: 1 / 2 / 3 / 5 / 8 / 12 / 20 / 32 → select according to SWL, rope path, and vessel drawing.
• SWL: 10–320 kN from supplied data → product selection load, not rope MBL or breaking load.
• Material: Casting C-Mn steel / casting stainless steel / special steel option → final grade and certificate scope should be confirmed before production.
• Surface Treatment: Sa 2.5 blasting + epoxy shop primer as reference → final coating follows vessel painting specification or customer requirement.
• Installation: Bulwark mounted → local reinforcement, weld detail, and installation procedure should be confirmed by drawing.
• Certificate Requirement: Available according to order scope → class inspection and certificate level should be confirmed before quotation.

How It Works

Mooring or towing line approaches the bulwark area → Rope passes through the closed chock opening → Smooth cast contact radius guides the rope path → Local contact force is transferred into the bulwark structure → Inspection and final coating are completed according to project requirement

Applications

Cargo vessels | Bulk carriers | Tankers | Container vessels | Tugboats | Workboats | Barges | Bulwark mooring stations | Towing-line guide positions | Newbuilding and replacement projects

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 DIN 81915 Form A a lifting product?

A1: No. This product is a bulwark mounted mooring / towing line chock used to guide and limit the rope path. It should not be described as a lifting eye, lifting pad, pulling winch, or lifting accessory.

Q2: Can the SWL in the table be treated as rope breaking load?

A2: No. The SWL values in the supplied table are product selection loads. Rope MBL, rope breaking load, proof load, and test load are different concepts and should be confirmed separately according to the vessel mooring or towing arrangement.

Q3: What information is needed before quotation?

A3: Confirm DIN 81915 Form A, nominal size, SWL, material grade, surface treatment, quantity, installation drawing, certificate requirement, delivery destination, and required delivery time.

A2: No. The SWL values in the supplied table are product selection loads. Rope MBL, rope breaking load, proof load, and test load are different concepts and should be confirmed separately according to the vessel mooring or towing arrangement.

Q3: What information is needed before quotation?

A3: Confirm DIN 81915 Form A, nominal size, SWL, material grade, surface treatment, quantity, installation drawing, certificate requirement, delivery destination, and required delivery time.