ISO 13797:2020

Ships and marine technology - Ship's mooring and towing fittings - Cruciform bollards

This document specifies the types, nominal sizes, dimensions and materials, as well as construction, manufacturing and marking requirements, for cruciform bollards suitable for installation on sea-going vessels to meet normal mooring and towing requirements.

Navires et technologie maritime — Corps-morts et ferrures de remorquage de navires — Croisillons

General Information

• Status: Published
• Publication Date: 27-Aug-2020
• ICS: 47.020.50 - Deck equipment and installations
• Technical Committee: ISO/TC 8/SC 4 - Outfitting and deck machinery
• Drafting Committee: ISO/TC 8/SC 4 - Outfitting and deck machinery
• Current Stage: 9060 - Close of review
• Completion Date: 04-Mar-2031

Relations

• Revises: ISO 13797:2012 - Ships and marine technology - Ship's mooring and towing fittings - Cruciform bollards
• Effective Date: 30-Sep-2017

Overview

ISO 13797:2020 - "Ships and marine technology - Ship's mooring and towing fittings - Cruciform bollards" specifies the types, nominal sizes, dimensions, materials, construction, manufacturing, inspection and marking requirements for cruciform bollards used on sea‑going vessels. The standard ensures bollards meet normal mooring and towing performance and provides guidance for safe working load (SWL) determination and on‑board marking.

Key topics and technical requirements

• Classification: Two manufacturing types
  • Type A: manufactured from steel pipes
  • Type B: manufactured from steel plates
• Nominal sizes: Main post outside diameters - 150, 200, 250, 300, 350, 400 mm.
• Materials:
  • Type B: weldable steel plates with yield point ≥ 235 N/mm²
  • Type A: weldable steel pipes with yield point ≥ 215 N/mm²
• Dimensions & mass: Detailed in Table 1 (standard) - includes geometry for main post, cross pipe, welding legs and reference SWL values.
• Strength assessment (Annex A): Based on simple beam theory with stress limits under SWL: bending ≤ 85% yield, shear ≤ 60% yield, combined ≤ 100% yield. A 2 mm wear allowance is deducted where rope contacts the surface; corrosion margin is covered in the stress criteria.
• Construction & deck reinforcement: Posts formed from pipe or plate; deck under bollard must be reinforced by carlings or stiffeners as shown in the standard.
• Manufacturing & inspection: Surfaces (including welds) must be free of visible flaws; rope-contact surfaces must be free of roughness that could abrade ropes; external anti‑corrosion coating required.
• Marking & documentation: SWL must be recorded in the ship’s towing and mooring plan (per IMO Circular MSC/Circ.1175) and marked on the bollard (e.g., weld bead) in tonnes and placed so it is not obscured.

Applications and users

ISO 13797:2020 is intended for:

• Shipbuilders and shipyards specifying deck fittings
• Marine equipment manufacturers (bollard OEMs)
• Naval architects and design offices integrating mooring/towing arrangements
• Classification societies and surveyors verifying compliance
• Ship operators, shipmasters and port engineers using towing and mooring plans

Practical uses include selection and installation of cruciform bollards to ensure compatible SWL, correct deck reinforcement, safe mooring/towing operations, and consistent manufacture and inspection practices.

Related standards

• IMO Circular MSC/Circ.1175 - Guidance on shipboard towing and mooring equipment
• ISO 2408 - Steel wire ropes - Requirements
• IACS UR A2 - Supporting hull structures for towing and mooring fittings
• OCIMF Mooring Equipment Guidelines (MEG4)

Keywords: ISO 13797:2020, cruciform bollards, ship's mooring and towing fittings, safe working load, SWL, deck reinforcement, maritime standards.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 13797
Second edition
2020-08
Ships and marine technology —
Ship's mooring and towing fittings —
Cruciform bollards
Navires et technologie maritime — Corps-morts et ferrures de
remorquage de navires — Croisillons
Reference number
©
ISO 2020
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
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Phone: [phone]
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Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Classification . 1
4.1 Type . 1
4.2 Nominal sizes . 1
5 Dimensions . 2
6 Materials . 2
7 Construction . 2
8 Manufacturing and inspection . 2
9 Marking . 2
Annex A (normative) Basis for strength assessment of cruciform bollards .5
Bibliography . 7
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
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www .iso .org/ iso/ foreword .html.
This document was prepared Technical Committee ISO/TC 8, Ships and marine technology, Subcommittee
SC 4, Outfitting and deck machinery.
This second edition cancels and replaces the first edition (ISO 13797:2012), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— the definition of SWL (3.1) has been reworded;
— a construction requirement has been added in 7.2.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved

INTERNATIONAL STANDARD ISO 13797:2020(E)
Ships and marine technology — Ship's mooring and towing
fittings — Cruciform bollards
1 Scope
This document specifies the types, nominal sizes, dimensions and materials, as well as construction,
manufactu
...