ISO 13797 Plate Fabricated Pipe Welded Mooring Towing Cruciform Bollards | Ship

Product Specification

ISO 13797 Plate Fabricated Pipe Welded Mooring Towing Cruciform Bollards | Ship Towing Equipment

Product Overview

The ISO 13797 cruciform bollard is a welded ship mooring and towing fitting suitable for installation on sea-going vessels where mooring ropes or towing lines need to be turned, held, and arranged around a strong deck-mounted bollard structure. The cruciform shape uses a main post and a cross pipe / cross member to improve rope holding and line arrangement compared with a simple single post, while the deck foundation and local reinforcement remain critical to the actual onboard load path.

This page is written for pipe-welded Type A and plate-fabricated Type B cruciform bollards according to ISO 13797:2020 and GB/T 36665-2018. The supplied table covers nominal sizes DN150 to DN400 with reference SWL values from 78 kN to 736 kN. The marked SWL should be treated carefully: ISO 13797 defines SWL for the intended fitting use, while the actual onboard SWL should be checked together with under-deck reinforcement, welding details, ship towing / mooring plan, and project approval requirement.

Quick Specifications

• Product type: Cruciform bollard for ship mooring and towing → deck fitting for rope holding, turning, and load transfer into reinforced deck structure.
• Standard reference: ISO 13797:2020 / GB/T 36665-2018 → reference for type classification, nominal sizes, dimensions, materials, construction, inspection, and marking requirements.
• Type range: Type A pipe-welded construction and Type B plate-fabricated construction → select according to vessel drawing, fabrication preference, and project specification.
• Nominal size range: DN150 to DN400 → the nominal size is related to the outside diameter of the main post in the standard classification.
• Reference SWL range: 78 to 736 kN / 8 to 75 t → SWL is the maximum applicable rope tension marked on the fitting; actual onboard application depends on deck reinforcement and approval.
• Main construction data: D1, D3, T1, T2, H, h, and welding leg length z → key values for drawing confirmation, fabrication checking, and shipyard installation planning.
• Calculated weight: 31 to 178 kg from the supplied table → useful for handling, packing, transport, and installation lifting arrangement.
• Manufacturing focus: welded pipe / plate structure, smooth rope-contact surfaces, anti-corrosion coating, clear SWL marking, and deck reinforcement coordination.

Main Technical Parameters

Selection & Inquiry Guide

Step 1: Confirm ISO 13797 / GB/T 36665 cruciform bollard and select DN150 / DN200 / DN250 / DN300 / DN350 / DN400 according to vessel drawing and mooring / towing plan.

Step 2: Confirm Type A pipe-welded construction or Type B plate-fabricated construction. Type A and Type B have different outside diameters, wall thicknesses, welding leg values, and calculated weights.

Step 3: Confirm rope load basis, intended mooring or towing duty, rope lead angle, number of rope turns, and required SWL marking. Do not select only by nominal size without checking the vessel load path.

Step 4: Confirm deck foundation, under-deck carlings / stiffeners, welding details, deck plate thickness, installation clearance, and relation with chocks, fairleads, winches, towing hooks, or other fittings.

Step 5: Confirm material grade, pipe / plate supply standard, stainless steel option if required, surface treatment, coating system, SWL marking method, and any low-temperature or special service requirement.

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

Step 7: Provide quantity, vessel type, installation drawing, delivery destination, required delivery time, and reference photos if replacement or repair work is involved.

Structure

Main post | Cross pipe / cross member | Closing plates | Welded pipe or plate-fabricated body | Deck welded base | SWL marking area | Reinforced deck support | Anti-corrosion protective finish

Welding, Load Path & Engineering Advantages

• The cruciform form provides a practical rope-holding geometry for mooring and towing lines, especially where the rope needs to be turned around a central post and cross member.
• Type A uses steel pipe construction, while Type B uses formed or fabricated steel plates. The correct type should follow the project drawing and fabrication requirement.
• Smooth rope-contact surfaces are important because rope abrasion can be caused by weld spatter, rough edges, surface irregularities, or poorly dressed transitions.
• The welded connection and deck reinforcement are part of the effective load path. The bollard should not be treated as an isolated fitting without checking the deck structure below it.
• ISO 13797 requires SWL marking on the fitting. The marked value should remain visible during operation and should align with the towing and mooring plan.
• Material traceability, welding quality, dimensional inspection, NDT, coating inspection, and class witnessing can be arranged according to the agreed project scope.
• The supplied SWL table is suitable for preliminary selection, but final use should consider rope direction, under-deck reinforcement, class approval, and the vessel’s onboard mooring / towing documentation.

Custom Attributes

• Standard: ISO 13797:2020 / GB/T 36665-2018 → use when the vessel specification calls for cruciform bollards for ship mooring and towing fittings.
• Type: Type A / Type B → Type A is pipe-welded construction; Type B is plate-fabricated construction.
• Nominal Size: DN150 / DN200 / DN250 / DN300 / DN350 / DN400 → select by vessel drawing, SWL requirement, and available deck space.
• SWL: 78 / 147 / 245 / 392 / 491 / 736 kN → marked SWL is the maximum applicable rope tension; actual onboard SWL should not exceed the standard reference and should consider reinforcement.
• Material: Mild steel or stainless steel according to order → actual pipe / plate grade, yield point, and certificate scope should be confirmed before production.
• Surface Treatment: Sa 2.5 blasting + epoxy shop primer as reference → final coating, galvanizing, mirror / satin polishing, DFT, and color follow project specification.
• Installation: Deck welded → deck reinforcement, carlings / stiffeners, weld details, and surrounding rope lead arrangement must be confirmed by shipyard or design office.
• Certificate Requirement: Available according to order scope → class inspection and certificate level should be confirmed before quotation.

How It Works

Mooring or towing rope approaches the bollard → Rope is turned or arranged around the cruciform post and cross member → Rope tension is transferred through the welded bollard body → Reaction load passes through the deck welds and reinforced deck structure → SWL marking and mooring / towing plan guide safe onboard use

Applications

Sea-going vessels | Cargo ships | Bulk carriers | Tankers | Container vessels | Tugboats | Workboats | Mooring stations | Ship towing arrangements | Newbuilding and replacement projects

Certifications & Advantages

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

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

Drawing & Photos

FAQ

Q1: What is the difference between Type A and Type B cruciform bollards?

A1: According to ISO 13797 type classification, Type A is manufactured by steel pipes and Type B is manufactured by steel plates. The two types have different dimensional values, wall thicknesses, welding leg lengths, and calculated weights, so the correct type should follow the vessel drawing.

Q2: Can the table SWL be used directly for the vessel without checking the deck structure?

A2: No. The table SWL is the maximum applicable rope tension reference for the fitting. Actual onboard SWL should be checked with the under-deck reinforcement, deck welds, rope lead direction, towing / mooring plan, and class approval requirement.

Q3: What information is needed before quotation?

A3: Confirm standard, type, nominal size, SWL requirement, material grade, surface treatment, quantity, SWL marking method, certificate scope, deck installation drawing, delivery destination, and required delivery time.