Steel Pipe Fabricated Marine Cross Bitt | JIS F 2804-1976 Ship Mooring Bitt

Steel Pipe Fabricated Marine Cross Bitt | JIS F 2804-1976 Ship Mooring Bitt

Product Overview

The steel pipe fabricated marine cross bitt is a deck welded mooring fitting based on JIS F 2804-1976. It uses a vertical main pipe and a horizontal cross pipe to provide a clear rope lead and holding point for ship mooring lines. The product is normally installed on the mooring deck and should be selected together with the vessel mooring arrangement, rope diameter, deck reinforcement, welding specification, coating system, and inspection requirement.

For this pipe fabricated version, the manufacturing focus is the welded pipe assembly. The deck connection should be prepared with bevel edges for deep-penetration groove welding according to the project welding procedure. The horizontal pipe and the vertical main pipe are also assembled with bevel-prepared welded joints. Compared with plate-rolled pipe construction, seamless or welded steel pipe can provide better roundness; if a fabricated seam exists in a rope-contact area, it should be dressed and ground smooth to reduce local rope damage.

Quick Specifications

• Product type: Steel pipe fabricated marine cross bitt → deck mooring fitting for rope holding and direction control.

• Standard: JIS F 2804-1976 → reference for nominal diameter, dimensions, weight, and applicable wire rope diameter.

• Nominal diameter range: 150 to 350 mm → covers small and medium ship mooring deck arrangements in the supplied table.

• Construction: vertical main pipe + horizontal cross pipe → cross-type rope holding geometry with a welded pipe assembly.

• Welding focus: bevel-prepared deck joint and pipe-to-pipe joint → supports deep-penetration welding according to approved WPS or project requirement.

• Rope protection focus: steel pipe roundness and ground smooth weld seams → helps reduce sharp local contact and rope wear.

• Weight range: 33 to 186 kg → useful for handling, deck installation planning, packing, and freight estimate.

• Surface treatment: Sa 2.5 blasting + epoxy shop primer, galvanized, polished stainless steel, or customized finish → final system should follow vessel specification.

Main Technical Parameters

Main webpage parameters for JIS F 2804-1976 steel pipe fabricated marine cross bitt. Dimensions are in mm unless otherwise stated. Rope diameter is the reference wire rope diameter from the supplied table and should not be read as SWL or MBL.

Selection & Inquiry Guide

Step 1: Confirm JIS F 2804-1976 steel pipe fabricated cross bitt and nominal diameter 150 to 350 according to the vessel drawing.

Step 2: Confirm mooring arrangement, rope diameter, rope lead direction, deck installation position, and whether the order is for newbuilding or replacement.

Step 3: Confirm deck welding interface, bevel preparation, deck reinforcement, and any shipyard welding or NDT requirement.

Step 4: Confirm material requirement: mild steel pipe, stainless steel pipe, or other project-required grade; also confirm pipe wall thickness or pipe schedule if specified.

Step 5: Confirm surface treatment: Sa 2.5 blasting + epoxy shop primer, final paint, galvanized finish, mirror / satin polished stainless steel, or customized finish.

Step 6: Confirm certificate scope before quotation: maker certificate, material certificate, class certificate, witness inspection, or class approval according to project requirement.

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

Structure

Steel pipe vertical main post | Horizontal cross pipe | Bevel-prepared pipe intersection weld | Deck welded base interface | Smooth rope-contact surface | Ground weld seam where required | Shop primer or specified surface finish

Pipe Fabrication, Welding & Rope Protection Advantages

• Steel pipe fabricated construction provides better roundness than plate-rolled pipe construction, which helps maintain a smoother rope-contact geometry.

• The deck connection can be prepared with bevel edges for deep-penetration groove welding according to the approved WPS and project welding requirement.

• The horizontal cross pipe and vertical main pipe should be assembled with controlled bevel preparation to improve weld access and joint consistency.

• Weld seams located near rope-contact surfaces should be dressed, ground, and smoothed so that the rope is not damaged by a raised seam, sharp edge, or uneven butt joint.

• Deck welded installation allows mooring force to be transferred into the reinforced deck structure; deck reinforcement and weld detail should be checked by the shipyard or design office.

• The nominal diameter range from 150 to 350 mm provides a clear selection path when the vessel drawing specifies JIS F 2804-1976 cross bitt dimensions.

• Surface treatment can be adapted to shipyard coating requirements, including shop primer, final paint, galvanized finish, or stainless steel polishing when specified.

• Inspection and certificate scope can be arranged according to order requirement, but class certificate or witness inspection should be confirmed before quotation.

Custom Attributes

• Standard: JIS F 2804-1976 → use when the shipyard or owner specification calls for this standard cross bitt arrangement.

• Product Configuration: Steel pipe fabricated cross bitt → vertical main pipe with horizontal cross pipe for deck mooring applications.

• Nominal Diameter: 150 / 200 / 250 / 300 / 350 mm → select according to vessel drawing, rope diameter, and deck arrangement.

• Material: Mild steel or stainless steel according to supplied specification → exact grade and pipe wall thickness should be confirmed before production.

• Installation: Deck welded → deck reinforcement, weld preparation, and installation position should be confirmed by drawing.

• Welding Preparation: Bevel-prepared deck joint and pipe intersection → deep-penetration welding according to approved WPS or project requirement.

• Rope Contact Finishing: Smooth steel pipe surface and ground weld seam where required → helps reduce rope wear at the contact area.

• Surface Treatment: Sa 2.5 blasting + epoxy shop primer, galvanized, polished, or customized finish → final coating follows vessel specification.

• Certificate Requirement: Available according to order scope → class inspection and certificate level should be confirmed before quotation.

How It Works

Mooring rope is led to the cross bitt → Rope turns around the smooth steel pipe body or cross pipe as arranged in the mooring plan → Local rope contact force is carried by the welded pipe assembly → Force is transferred through the deck welded base to the reinforced deck structure → Weld inspection and final coating are completed according to project requirement

Applications

Cargo vessels | Tankers | Bulk carriers | Container vessels | Workboats | Tugboats | Deck mooring stations | Newbuilding projects | Replacement of JIS F 2804 cross bitts

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: Does the JIS F 2804 cross bitt table provide SWL?

A1: No SWL was supplied in the provided table. The table provides nominal diameter, main dimensions, weight, and reference wire rope diameter. The wire rope diameter should not be interpreted as product SWL or MBL. Selection should be checked according to the mooring arrangement, rope diameter, design load, deck reinforcement, weld detail, and project approval requirement.

Q2: Why use steel pipe instead of plate-rolled pipe for this cross bitt?

A2: Steel pipe generally provides better roundness and a cleaner rope-contact surface than plate-rolled pipe. Plate-rolled pipe may have a longitudinal seam or local unevenness; if it is used, the seam and butt weld area should be ground smooth to reduce rope damage. Final construction should follow the project material and manufacturing requirement.

Q3: What information is needed before quotation?

A3: Confirm standard, nominal diameter, material grade, pipe wall thickness if specified, surface treatment, quantity, certificate scope, welding / inspection requirement, deck installation drawing, delivery destination, and required delivery time.