Marine Delta Plate for Towing Bridle | Steel Triangle Plate for Ship Towing

Product Specification

Marine Delta Plate for Towing Bridle | Steel Triangle Plate for Ship Towing Equipment

Product Overview

The marine delta plate, also called a steel triangle plate or towing bridle plate, is a load-rated towing connector used to combine towing lines into a towing bridle arrangement. It is normally fitted between towing ropes, wire ropes, shackles, chains, or other approved towing fittings where the towing load needs to be distributed through a triangular connection plate.

This page is prepared for steel marine delta plates with Safe Working Load from 17 to 600 ton and maximum breaking load from 85 to 3000 ton according to the supplied table. The product is not a deck fairlead, bollard, or winch; it is a removable towing connection plate. Material grade, hole arrangement, pin / shackle compatibility, load direction, proof-test procedure, and certificate scope should be confirmed according to the towing arrangement and project requirement.

Quick Specifications

• Product type: Marine delta plate / steel triangle plate → connector plate for ship towing bridle arrangements.
• Application focus: towing lines combined into a bridle → used to connect and distribute towing load between compatible towing components.
• SWL range: 17 to 600 ton as supplied → selected according to towing load, bridle geometry, and connected fitting ratings.
• Maximum breaking load range: 85 to 3000 ton as supplied → kept separate from SWL and proof-test load to avoid incorrect load interpretation.
• Proof test: 150% SWL → test load, loading direction, holding time, and witness requirement should be confirmed before order.
• Material options: forging alloy steel, forging C-Mn steel, higher tensile mild steel plate, or stainless steel → final grade and heat treatment should be specified.
• Edge finishing: all free edges ground to R3 without burrs → important for safer handling and reducing sharp contact around shackles or ropes.
• Surface treatment: paint, galvanized, or mirror polished → choose according to corrosion environment, material type, and customer inspection requirement.

Main Technical Parameters

Selection & Inquiry Guide

Step 1: Confirm the product type: straight type or curved type marine delta plate / triangle plate for towing bridle use.

Step 2: Select SWL and maximum breaking load according to the towing plan, bollard pull, expected dynamic load, and approval requirement.

Step 3: Confirm bridle layout, number of connected lines, shackle type, pin diameter, hole size, load direction, and whether the plate connects wire rope, synthetic rope, chain, or a mixed towing assembly.

Step 4: Confirm material requirement: forging alloy steel, forging C-Mn steel, higher tensile mild steel plate, stainless steel, or project-specified material.

Step 5: Confirm proof test requirement: 150% SWL, loading direction, fixture arrangement, holding time, acceptance criteria, test report, and class witness scope.

Step 6: Confirm surface treatment: paint, galvanized finish, mirror polished stainless steel, or special corrosion protection for the vessel operating area.

Step 7: Provide quantity, vessel type, towing arrangement drawing, connected shackle / rope data, certificate requirement, delivery destination, and required delivery time.

Structure

Triangular steel plate body | Multiple connection holes | Straight or curved type option | Rounded free edges ground to R3 | Shackle / towing line connection interface | Proof-test load path | Paint, galvanized, or polished surface finish

Towing Bridle, Load & Engineering Advantages

• The triangular plate provides a compact connection point for combining towing lines into a towing bridle, helping the towing arrangement form a defined load path between the connected fittings.
• The supplied table separates Safe Working Load and maximum breaking load. These terms should not be mixed with proof load, test load, rope MBL, or vessel bollard pull.
• All free edges should be ground to R3 without burrs, reducing sharp edge risk around connected shackles, rope eyes, wire rope sockets, and crew handling areas.
• Forged steel or higher tensile steel plate options can be selected according to towing load, plate thickness, hole geometry, heat treatment, traceability, and certificate requirement.
• Proof testing at 150% SWL can be arranged according to order scope. The test method should reproduce the approved loading direction as far as practical.
• Surface protection can be selected for the operating environment: painted carbon steel, galvanized finish, or mirror polished stainless steel when corrosion resistance and appearance are important.
• For high-load towing applications, the delta plate should be checked together with shackles, rope eyes, wire rope sockets, chains, swivels, towing pins, and towing winch / hook arrangement.

Custom Attributes

• Product Name: Marine Delta Plate / Steel Triangle Plate → common towing connector used in towing bridle arrangements.
• Type: Straight type / curved type → select according to towing assembly geometry and customer drawing.
• SWL: 17 to 600 ton → supplied load class for selection; final marking follows agreement between user and manufacturer.
• Maximum Breaking Load: 85 to 3000 ton → supplied ultimate load reference; not the same as SWL or proof-test load.
• Proof Test: 150% SWL → proof-test procedure and witness requirement should be agreed before production.
• Material: Forging alloy steel / forging C-Mn steel / higher tensile mild steel plate / stainless steel → final grade, heat treatment, and traceability should be confirmed.
• Edge Finish: R3 free edge without burrs → important for contact safety and reducing sharp-edge damage around connected fittings.
• Surface Treatment: paint / galvanized / mirror polished → selected by material type, corrosion environment, and project requirement.
• Certificate Requirement: available upon request and subject to order scope → class certificate, maker certificate, material certificate, and test report should be confirmed before quotation.

How It Works

Two or more towing lines are connected to the delta plate → Shackles or approved end fittings are fitted through the plate holes → Towing load is distributed through the triangular plate body → Proof-tested load path and certificate scope are checked according to the order requirement → The complete towing bridle is assembled and inspected before use

Applications

Ship towing bridle arrangements | Tugboat towing connection | Workboat towing gear | Salvage towing assemblies | Harbor towing equipment | Offshore support towing when approved | Wire rope and synthetic rope towing systems | New towing gear supply and replacement projects

Certifications & Advantages

Certificates can be arranged according to project requirement, inspection scope, material traceability, proof-test requirement, 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 maximum breaking load the same as SWL or proof-test load?

A1: No. The table lists SWL and maximum breaking load as separate values. Proof testing is specified as 150% SWL in the supplied data. These terms should not be mixed, and the final marking should follow the project agreement and certificate requirement.

Q2: What information is needed to select the correct delta plate?

A2: Confirm SWL, maximum breaking load, towing bridle arrangement, connected shackle size, rope or wire end fitting, load direction, material grade, surface treatment, proof-test requirement, certificate scope, quantity, and delivery destination.

Q3: Can this delta plate be used for offshore or salvage towing?

A3: It can be considered for offshore support or salvage towing only when the complete towing arrangement, dynamic load, connected fittings, proof test, inspection scope, and class or project approval requirement are confirmed. The webpage table alone should not replace a project towing design check.