Marine Spurling Pipe with Cast Steel Chain Guide Mouth or Welded Type for Anchor

Product Specification

Marine Spurling Pipe / Chain Pipe | Cast Steel Chain Guide Mouth or Welded Type for Anchor Chain Lockers

Product Overview

The marine spurling pipe, also known as a chain pipe, is an anchor-chain conduit arranged between the anchor windlass chain wheel and the chain locker. Its typical construction combines a cast steel chain guide mouth with a seamless steel pipe or rolled steel plate body. For welded configurations, the guide bend is fabricated from steel plate, while the bell mouth and chafing edges can be formed with steel plate and half-round steel according to the approved drawing.

The pipe is normally arranged vertically or at a suitable inclination according to the windlass chain lead and chain-locker position. CB 3133-1983 distinguishes Type A with a cast chain guide mouth and Type B with a welded guide section. Upper and lower chain-contact surfaces are rounded or flared to reduce abnormal bending, local wear, and chain jamming. For newbuilding projects, final dimensions, materials, plate thicknesses, closure arrangement, watertight boundary, drainage, welding, and inspection should follow current project requirements and approved vessel drawings.

Quick Specifications

• Product type: Marine spurling pipe / chain pipe → guides anchor chain from the windlass chain wheel into the chain locker.
• Typical construction: Cast steel chain guide mouth + seamless steel pipe or rolled steel plate body → combines wear-resistant chain-contact geometry with a fabricated pipe structure.
• Legacy Type A: Cast chain guide mouth, chain-size groups 15–17 to 49–53 mm → suitable for legacy replacement or compatibility projects based on CB 3133-1983.
• Legacy Type B: Welded guide section, chain-size groups 11–13 to 31–34 mm → the standard limits this type to chain diameters not exceeding 34 mm.
• Chafing and bell-mouth details: Rounded or flared steel surfaces, commonly fabricated with steel plate and half-round steel → reduce sharp contact, wear, and chain jamming.
• Pipe body: Rolled steel plate or seamless steel tube; body length L selected by the user → final route and inclination follow the windlass and chain-locker arrangement.
• Watertightness and closure: Boundary, access, drainage, and permanently attached closing appliance follow applicable load-line, class, and approved drawing requirements.
• Design basis: Current vessel-specific drawings, applicable class rules, IACS UR L4, Load Line Regulation 22-2, and CB/Z 280-2011 → CB 3133-1983 remains a withdrawn legacy reference.

Main Technical Parameters

Selection & Inquiry Guide

Step 1: Confirm whether the required product is a Type A spurling pipe with a cast steel chain guide mouth, a Type B welded configuration, or a customized project design.

Step 2: Provide anchor chain nominal diameter, chain grade, actual link dimensions, windlass chain-wheel arrangement, and chain travel direction.

Step 3: Provide the forecastle deck, windlass, chain stopper, chain locker, and surrounding structural drawings, including the required pipe length L and inclination.

Step 4: Confirm cast guide-mouth or welded guide construction, pipe body material, half-round steel chafing edge, bell mouth, cover plate, wear allowance, and minimum design temperature.

Step 5: Confirm watertight boundary, access cover, permanently attached closing appliance, chain-locker drainage, welding procedure, deck and locker reinforcement, coating system, and inspection scope.

Step 6: State whether the project is newbuilding, vessel modification, or CB 3133-1983 legacy replacement; provide quantity, class society, destination, and required delivery time.

Structure

Cast steel chain guide mouth for Type A or welded guide bend for Type B | Seamless steel pipe or rolled steel plate body | Fabricated bell mouth with steel plate and half-round steel chafing edge | Cover plate | Backing plate and brackets | Pin and cotter pin | Deck penetration and welded boundary | Chain-locker connection | Specified closing and coating arrangement

Anchor Chain Guidance, Watertightness & Installation Advantages

• A cast steel chain guide mouth provides a smooth curved chain-contact passage and can be heat treated, dressed, and inspected separately before assembly.
• A welded Type B guide section provides an alternative fabricated construction for the smaller chain-size range defined by the legacy standard.
• The steel pipe or rolled plate body allows the length L and installation route to be matched to the windlass and chain-locker arrangement.
• Half-round steel or another approved rounded chafing detail can be welded to the bell-mouth edge to protect the chain from sharp plate contact.
• Internal seams, transitions, and local protrusions should be ground smooth so they do not obstruct chain travel or create concentrated wear points.
• The deck and chain-locker interfaces should be coordinated with watertight boundaries, local reinforcement, welding procedures, and the approved hull drawing.
• Casting inspection, weld inspection, dimensional control, coating, drainage, closure, and final assembly checks can be arranged according to the project specification.

Custom Attributes

• Product Name: Marine spurling pipe / chain pipe → conduit between the anchor windlass chain wheel and the chain locker.
• Primary Construction: Cast steel chain guide mouth + steel pipe or rolled steel plate body → typical Type A arrangement and common modern fabrication practice.
• Alternative Construction: Welded steel guide section → Type B legacy arrangement for the smaller chain-size range.
• Chafing Edge: Steel plate + half-round steel or approved rounded detail → protects the chain at the bell-mouth and opening edges.
• Legacy Type A Range: 15–17 / 19–22 / 25–28 / 31–34 / 37–40 / 43–46 / 49–53 mm chain groups → use only when the legacy standard is required.
• Legacy Type B Range: 11–13 / 15–17 / 17–19 / 19–22 / 25–28 / 31–34 mm chain groups → Type B is limited to 34 mm and below in the standard.
• Pipe Body: Rolled steel plate or seamless steel tube → length L is selected according to the vessel arrangement.
• Material Basis: Legacy Type A guide mouth ZG25 cast steel; other parts A3 carbon steel → modern equivalent grades require project confirmation.
• Certificate Requirement: Material traceability, casting inspection, welding records, NDT, dimensional inspection, and class witnessing are available according to the agreed order scope.

How It Works

Anchor chain leaves the windlass chain wheel → Chain enters the cast or welded guide section → Rounded chain-contact surfaces guide the change in direction → Steel pipe body leads the chain vertically or at the approved inclination → Bell mouth directs the chain into the locker → Closing and drainage arrangements control seawater, mud, and debris

Applications

Merchant ships | Tugboats | Workboats | Offshore support vessels | Cargo vessels | Tankers | Newbuilding anchoring systems | Vessel conversion projects | Legacy CB 3133 replacement and compatibility work

Certifications & Advantages

Material certificates, welding documentation, NDT reports, dimensional inspection records, watertightness-related inspection, maker documentation, and class witnessing can be arranged according to the project specification and agreed order scope.

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

Drawing & Photos

FAQ

Q1: What is the difference between a spurling pipe and a hawse pipe?

A1: A spurling pipe or chain pipe guides the anchor chain from the windlass chain wheel down to the chain locker. A hawse pipe guides the anchor chain from the deck anchoring arrangement toward the shell opening, anchor pocket, or anchor bed. They are separate components in the vessel anchoring system.

Q2: What is the difference between CB 3133 Type A and Type B?

A2: Type A uses a cast steel chain guide mouth connected to a steel pipe or rolled plate body and covers the larger legacy chain-size range. Type B uses a welded guide section and is limited by the standard to chain diameters of 34 mm and below. The final choice should follow the vessel drawing, chain size, installation route, and project approval requirements.

Q3: Can CB 3133-1983 be used as the current manufacturing standard?

A3: No. CB 3133-1983 is withdrawn and has no identified one-to-one replacement. It can be used for legacy replacement, compatibility, and historical dimensions. New projects should use current class and statutory requirements together with approved vessel-specific drawings.