20–200T Bolted Anchorage Double Bitt Dock Bollard | Cast Steel / Ductile Iron Inclined Mooring Bollard

20–200T Bolted Anchorage Double Bitt Dock Bollard | Cast Steel / Ductile Iron Inclined Mooring Bollard

Product Overview

The bolted anchorage double bitt dock inclined bollard is a quay-side mooring bollard used on berths, jetties, wharves, shipyards, and marine terminals for vessel mooring and shifting operations. The inclined double-bitt shape provides a practical rope-holding arrangement, while the rounded rope-contact areas and bolted base help transfer mooring force into the reinforced dock structure through anchorage bolts.

This bollard can be supplied in cast steel or cast ductile iron / SG iron according to project requirement. For dock bollards, casting quality is a safety-critical point because harmful casting defects, sharp transitions, or poor anchorage details may affect long-term mooring reliability. We normally use wooden pattern casting with controlled moulding, riser and finishing practices to improve casting soundness, reduce harmful gas porosity and slag inclusion, and keep smooth radius transitions around the rope-contact and load-transfer areas.

Quick Specifications

• Bollard capacity: 20 to 200 t → covers common berth and wharf mooring load requirements from small berths to larger marine terminals.
• Bollard type: inclined double bitt dock bollard → suitable for quay-side mooring where rope holding, line lead angle, and bollard access are important.
• Material options: cast C-Mn steel or cast ductile iron / SG iron → final material should follow berth design, owner specification, and inspection requirement.
• Ductile iron option: good wear resistance at rope-contact areas → useful where repeated mooring rope contact and abrasion are expected.
• Anchorage system: hot-dip galvanized carbon steel anchorage bolts → provides mechanical fixing to the dock structure with improved corrosion protection.
• Bolt quantity: 8 to 10 bolts according to capacity size → anchor bolt layout must match the civil foundation and installation drawing.
• Rope lead angle reference: -45° to +45° vertical and 0° to 180° horizontal → final application should be checked by berth mooring arrangement.
• Inspection option: UT / MT and FEA calculation available upon request → used when the project requires additional casting soundness or strength verification.

Main Technical Parameters

Selection & Inquiry Guide

Step 1: Confirm required bollard capacity from 20 to 200 t according to berth design load, vessel size, mooring arrangement, and civil foundation design.

Step 2: Confirm material requirement: cast C-Mn steel, cast ductile iron / SG iron, cast iron, or stainless steel if specifically required by the project.

Step 3: Confirm anchorage details, including bolt quantity, anchor bolt grade, hot-dip galvanizing requirement, template, grout, and dock foundation interface.

Step 4: Confirm rope lead angle, typical mooring line direction, bollard spacing, and whether finite element calculation is required for the bollard or anchorage area.

Step 5: Confirm surface treatment: Sa 2.5 blasting + epoxy shop primer as reference, final coating system, body galvanizing if specified, or customized coating requirement.

Step 6: Confirm inspection and certificate scope before quotation: material certificate, maker certificate, UT / MT, class witness, third-party inspection, or project-specific approval.

Step 7: Provide quantity, delivery destination, required delivery time, installation drawing, foundation drawing, and reference photo if replacement or retrofit is involved.

Structure

Cast bollard body | Inclined double-bitt head | Smooth rope-contact radius | Bolted mounting base | Anchorage bolt holes | Hot-dip galvanized carbon steel anchorage bolts | Epoxy shop primer or specified surface treatment

Casting, Anchorage & Engineering Advantages

• Wooden pattern casting is normally used for this dock bollard, helping control the external shape, mould consistency, and repeated dimensional quality during production.
• Casting quality is treated as a safety-critical manufacturing point, with attention to moulding, feeding, cleaning, and finishing to reduce harmful porosity, slag inclusion, shrinkage risk, and unacceptable casting indications.
• The rope-contact and transition areas are finished with smooth radius changes to reduce local stress concentration and avoid sharp contact points that may damage mooring ropes.
• Cast steel can be selected when the project requires stronger impact resistance and a robust cast body, while ductile iron / SG iron can be selected where wear resistance and casting performance are important.
• The bolted anchorage arrangement allows the bollard to be fixed to the dock or wharf by anchorage bolts; the civil foundation, reinforcement, grout, and bolt embedment should be checked by the berth designer.
• Hot-dip galvanized carbon steel anchorage bolts provide corrosion protection and reliable fastening performance when installed according to the project anchorage design.
• UT / MT non-destructive testing can be arranged according to customer requirement to verify critical casting areas and support project inspection acceptance.
• Finite element calculation can be provided upon request to review stress distribution around the bitt head, base, radius transitions, and anchorage area.

Custom Attributes

• Product Type: Bolted anchorage double bitt dock inclined bollard → quay-side mooring equipment for berths, wharves, and jetties.
• Capacity Range: 20 / 30 / 50 / 75 / 100 / 125 / 150 / 175 / 200 t → select according to berth mooring design and vessel operation requirement.
• Material: Cast C-Mn steel or cast ductile iron / SG iron → final material grade and mechanical properties should be confirmed before production.
• Casting Method: Wooden pattern casting as normal practice → supports controlled moulding, repeatable geometry, and improved casting quality.
• Anchorage Bolt: Hot-dip galvanized carbon steel → used to fix the bollard to the dock foundation with corrosion protection.
• Safety Factor: 3 times as supplied parameter → final safety factor and load basis should follow project specification and approval requirement.
• Rope Lead Angle: -45° to +45° vertical / 0° to 180° horizontal as supplied reference → actual line angle should be checked with berth arrangement.
• Surface Treatment: Sa 2.5 blasting + one layer epoxy shop primer as reference → final coating system to be confirmed according to site environment.
• Inspection: UT / MT available upon request → used for critical casting soundness verification when required by customer or project specification.
• Engineering Review: FEA available upon request → used to support stress review and anchorage design discussion.

How It Works

Mooring rope is placed around the inclined double-bitt head → Smooth rope-contact radius guides the rope and reduces sharp local contact → Mooring force is transferred through the cast bollard body to the bolted base → Hot-dip galvanized anchorage bolts transfer the force into the reinforced dock foundation → Inspection and coating are completed according to project requirement

Applications

Commercial port berths | Wharf and quay wall mooring points | Jetty and pier mooring positions | Shipyard newbuilding berth | Repair yard mooring area | Marine terminal | Tug and workboat berth | Replacement of existing dock bollards

Certifications & Advantages

Certificates and inspection documents can be arranged according to project requirement, inspection scope, material traceability, and approval procedure. Class society inspection or third-party witness inspection should be confirmed before quotation and production.

Certification: Third party inspection certificate, Pull load test certificate.

Drawing & Photos

FAQ

Q1: How should the correct dock bollard capacity be selected?

A1: Capacity should be selected according to berth design load, vessel type, mooring arrangement, rope lead angle, bollard spacing, wharf structure, anchorage bolt design, and project approval requirement. The nominal capacity table is a selection reference and should be checked with the civil foundation design.

Q2: What is the difference between cast steel and ductile iron bollards?

A2: Cast steel is commonly selected where impact resistance and robust cast structure are required. Cast ductile iron / SG iron provides good wear resistance and stable casting performance for repeated rope contact. The final material should follow the owner specification, design load, and inspection requirement.

Q3: What quality control is important for bolted dock bollards?

A3: Important quality points include casting soundness, smooth radius finishing, dimensional control, bolt-hole accuracy, anchorage bolt quality, surface preparation, coating, and optional UT / MT inspection. If the berth design requires additional verification, FEA calculation and project-specific inspection can be arranged.