Cast Steel Large Double Bitt Bollard | ASTM A27-70-36 for Inland Barge Mooring

Cast Steel Large Double Bitt Bollard | ASTM A27-70-36 for Inland Barge Mooring

Product Overview

The cast steel large double bitt bollard is a deck mooring fitting used as a fixed rope holding point on inland barges, river vessels, workboats, tugs, and ship mooring stations. It is supplied in 12 inch and 14 inch sizes with or without horns, with 10 inch availability to be confirmed according to drawing and project requirement. The bollard body is made from ASTM A27 Grade 70-36 C-Mn cast steel or equivalent, with heat treatment, mechanical property testing, and surface finishing arranged according to the purchase specification.

This bollard is particularly suitable for inland barge and river fleet projects in the Americas, including the United States, Brazil, Chile, Colombia, and Argentina, where buyers often require reliable cast steel quality, competitive batch supply, inspection traceability, and practical deck installation support. The reinforced base design, smooth rope-contact radii, optional non-destructive examination, FEA review, and load test arrangement should be confirmed together with the vessel drawing, mooring load basis, deck reinforcement, and certificate scope.

Quick Specifications

• Product type: Large double bitt cast steel bollard → fixed deck mooring point for barge and ship mooring arrangements.
• Nominal sizes: 12 inch and 14 inch → main supplied sizes for large inland barge and vessel mooring applications.
• Optional configuration: with or without horns → horn arrangement should follow the vessel drawing and rope handling practice.
• Material grade: ASTM A27 Grade 70-36 C-Mn cast steel or equivalent → material equivalency and test values should be confirmed before order release.
• Reinforced base: additional center stiffeners → improves local strength and load transfer when checked with the project load basis and deck structure.
• Smooth rope-contact surface: rounded bitt radius and smooth section transitions → helps reduce rope cutting risk and local stress concentration.
• Approximate weight: 1045 lb / 474 kg for 12 inch and 1596 lb / 724 kg for 14 inch → useful for handling, installation planning, packing, and freight estimate.
• Inspection options: mechanical test, heat treatment record, DPT, MT / MPI, local RT, FEA review, and load test → arranged according to project requirement and approval scope.

Main Technical Parameters

Selection & Inquiry Guide

Step 1: Confirm the required nominal size: 12 inch or 14 inch, with or without horns. For 10 inch supply, confirm drawing, dimensions, and quantity before quotation.

Step 2: Confirm application vessel type and installation position, such as inland barge deck, river vessel mooring station, tug deck, or replacement bollard position.

Step 3: Confirm mooring load basis, required SWL / design load if available, rope arrangement, rope wrap angle, deck reinforcement, and welding / mounting interface.

Step 4: Confirm material and surface treatment: ASTM A27 Grade 70-36 or equivalent, heat treatment requirement, sandblasting, shop primer, final coating, or special corrosion protection.

Step 5: Confirm inspection and certificate scope before quotation: material test report, heat treatment record, DPT, MT / MPI, local RT, FEA calculation, load test, third-party inspection, ABS / class approval, type approval, or design approval when required.

Step 6: Provide quantity, delivery destination, required delivery time, vessel drawing, existing bollard photos, and any shipyard or owner specification.

Structure

Cast steel double-bitt body | Twin rope-contact bitts | Optional horn configuration | Reinforced base with center stiffeners | Deck welding / mounting interface | Heat-treated ASTM A27-70-36 casting | Blasted and shop-primed finish

Casting, Inspection & Mooring Engineering Advantages

• ASTM A27 Grade 70-36 or equivalent cast steel is suitable for barge and vessel mooring fittings where casting strength, toughness, and traceable mechanical properties are required.
• Lost foam casting or sand mould casting can be selected according to size, batch quantity, dimensional requirement, and production arrangement.
• The additional stiffeners in the middle of the base help improve local structural continuity and load transfer from the bitts to the deck connection area.
• Smooth rope-contact surfaces, rounded radii, and curved section transitions reduce sharp local contact and help avoid unnecessary rope damage during mooring operations.
• Heat treatment before delivery supports stable mechanical properties and more consistent casting performance for repeated barge bollard supply.
• Dye penetrant testing, magnetic particle examination, and local radiographic testing can be arranged for critical areas where stress concentration or casting indication control is required.
• FEA-based strength calculation and load / pull test can be arranged according to project requirement, drawing approval scope, and inspection plan.
• Cost-effective cast steel production is suitable for inland barge fleets and replacement projects that require reliable casting quality without unnecessary over-specification.

Custom Attributes

• Product Category: Cast steel double bitt bollard → fixed mooring fitting for ship, barge, and marine deck mooring arrangements.
• Material: ASTM A27 Grade 70-36 or equivalent → final material equivalency, chemical composition, and mechanical properties should be confirmed by the order specification.
• Nominal Size: 12 inch / 14 inch → select according to vessel drawing, rope arrangement, required load basis, and available deck space.
• Horn Option: With horns or without horns → confirm according to rope handling method and existing bollard arrangement.
• Casting Workmanship: Lost foam or sand mould → production method depends on batch quantity, size, pattern availability, and inspection requirement.
• Base Reinforcement: Center stiffeners added → supports improved load transfer and local stiffness when matched with deck reinforcement and approved design basis.
• Inspection Scope: Mechanical test / heat treatment / DPT / MT / RT / load test → inspection items should be specified before production and quotation.
• Certificate Requirement: Third-party or classification approval available upon request → certificate type is subject to order scope and class approval procedure.
• Surface Treatment: Sandblasting and shop primer → final coating system should follow the vessel painting specification or customer requirement.

How It Works

Mooring rope approaches the bollard → Rope is turned around the double bitts and optional horn area → Smooth cast radius supports rope contact → Mooring force is transferred through the cast body and reinforced base → Deck reinforcement and weld / mounting interface distribute the load into the vessel structure

Applications

Inland barges | River barges | Workboats | Tugboats | Push boats | Cargo vessel deck mooring stations | Shipyard replacement projects | United States inland barge fleets | Brazil, Chile, Colombia, and Argentina river vessel projects

Certifications & Advantages

Certificates and approval documents can be arranged according to project requirement, inspection scope, material traceability, and classification society approval procedure. Third-party inspection certificate, classification society type approval certificate, and class design approval can be provided when included in the approved project scope.

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

Drawing & Photos

FAQ

Q1: How should the correct 12 inch or 14 inch bollard size be selected?

A1: Select the size according to the vessel drawing, required mooring load basis, rope arrangement, deck space, rope wrap angle, horn requirement, and deck reinforcement. The 14 inch bollard has larger main dimensions and higher approximate weight, but the final SWL or design load still needs project confirmation.

Q2: Does the supplied dimension table define SWL?

A2: No. The supplied table provides dimensions and approximate weight only. SWL, design load, proof load, and acceptance criteria should be confirmed by project specification, FEA calculation, class / third-party approval, and load test plan when required.

Q3: What inspection and certificate documents can be provided?

A3: Material property test report, heat treatment record, maker certificate, DPT, MT / MPI, local RT, FEA calculation report, load test report, third-party inspection certificate, ABS / class approval, type approval, or design approval can be arranged according to order scope and project requirement.