ISO 13795:2020

Ships and marine technology - Ship's mooring and towing fittings - Welded steel bollards for sea-going vessels

This document specifies the types, nominal sizes, dimensions and materials, as well as construction, manufacturing and marking requirements, for welded steel 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 — Bittes d'amarrage en acier soudées pour navires de haute mer

General Information

• Status: Published
• Publication Date: 27-Aug-2020
• ICS: 47.020.50 - Deck equipment and installations
• ICS: 47.040 - Seagoing vessels
• Technical Committee: ISO/TC 8/SC 4 - Outfitting and deck machinery
• Drafting Committee: ISO/TC 8/SC 4/WG 4 - Ship's mooring and towing fittings
• Current Stage: 9060 - Close of review
• Completion Date: 04-Mar-2031

Relations

• Revises: ISO 13795:2012 - Ships and marine technology - Ship's mooring and towing fittings - Welded steel bollards for sea-going vessels
• Effective Date: 30-Sep-2017

Overview

ISO 13795:2020 - Ships and marine technology - Ship's mooring and towing fittings - Welded steel bollards for sea‑going vessels - defines requirements for welded steel bollards intended for normal mooring and towing on sea‑going ships. The standard covers classification by type, nominal sizes, dimensions, materials, construction, manufacturing and inspection, marking and the basis for strength assessment. It replaces the 2012 edition and includes updated technical guidance on selection, D/d ratios and strength assessment.

Key topics and requirements

• Types and nominal sizes: Bollards are classified as Type A (compact base plate) or Type B (wide base plate). Nominal post diameters range from 150 up to 600 mm with size variants (e.g. 250A/250B, 300A/300B, etc.) specified in the tables.
• Dimensions and SWL: Detailed dimensional tables and safe working load (SWL) and towing values are given for one‑rope and two‑rope use. SWL markings are expressed in tonnes (t) and must be visible during operation.
• Materials: Base plates and posts are made from weldable steel with a minimum yield point of 235 N/mm²; posts may be formed from plate or steel tubes.
• Construction: Posts may be pipe or plate formed; fins are required to keep ropes low and reduce bending loads. An eye plate for stopping‑off rope/chain is required.
• Load assessment: Annex A provides the basis for strength assessment using simple beam theory and defined load cases (figure‑of‑eight belay produces a resultant 2P; two ropes can impose up to 4P shear at the post base).
• Manufacturing & inspection: Surfaces (including welds) must be free of visible flaws; rope contact surfaces must be smooth to avoid abrasion. External anti‑corrosion coating is required; low‑friction coatings are not recommended as they reduce holding force.
• D/d ratio and rope effects: Selection guidance addresses the D/d ratio (bollard diameter to rope diameter) and notes that rope tensile strength can be reduced by tight bend radii per rope manufacturer advice.

Applications and users

ISO 13795:2020 is used by:

• Shipbuilders and naval architects specifying deck fittings
• Bollard and deck‑fitting manufacturers
• Ship operators, shipyards and maintenance crews for procurement, installation and inspection
• Classification societies and marine surveyors verifying compliance
• Port and towing equipment planners integrating mooring/towing plans

Practical benefits include standardized dimensions and SWL values for safe mooring/towing design, clearer marking and inspection criteria, and improved interoperability of fittings across vessels and suppliers.

Related standards

• IMO Circular MSC/Circ.1175 - Guidance on shipboard towing and mooring equipment (normative reference cited in ISO 13795:2020)
• Work developed by ISO/TC 8 (Ships and marine technology), SC 4 (Outfitting and deck machinery)

Keywords: ISO 13795:2020, welded steel bollards, ship's mooring, towing fittings, safe working load, SWL, D/d ratio, mooring lines, shipbuilding, deck fittings.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 13795
Second edition
2020-08
Ships and marine technology — Ship's
mooring and towing fittings — Welded
steel bollards for sea-going vessels
Navires et technologie maritime — Corps-morts et ferrures de
remorquage de navires — Bittes d'amarrage en acier soudées pour
navires de haute mer
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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Published in Switzerland
ii © ISO 2020 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
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 welded steel bollards .10
Bibliography .13
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
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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 13795:2012), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— technical guidelines have been added in 7.4 and 7.5;
— the definition of SWL (3.1) has been reworded;
— the mark numbers and extension numbers in Figures 1 and 2 have been amended;
— the values in Table 1 and Table 2 have been amended;
— the text in Clause A.5 has been amended.
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

Introduction
A bollard is a type of ship’s mooring and towing fitting installed on board to belay the mooring and
towing rope.
INTERNATIONAL STANDARD ISO 13795:2020(E)
Ships and marine technology — Ship's mooring and towing
fittings — Welded steel bollards for sea-going vessels
1 Scope
This document specifies the types, nominal sizes, dimensions and materials, as well as construction,
manufacturing and marking requirements, for welded steel bollards suitable for installation on sea-
going vessels to meet normal mooring and towing requirements.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
IMO Circular MSC/Circ.1175, Guidance on shipboard towing and mooring equipment
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
safe working load
SWL
safe load limit (maximum permissible load) of the fittings used for mooring
3.2
TOW
safe load limit (maximum permissible load) of the fittings used for normal and other towing operations
4 Classification
4.1 Type
Depending on the construction, welded steel bollards shall be classified as belonging to one of the
following two types:
a) Type A: with compact base plate;
b) Type B: with wide base plate.
4.2 Nominal sizes
The nominal sizes, D , of bollards are denoted by reference to the outside diameter of the post, in
n
millimetres, in terms of the nearest number drawn from a basic series of preferred numbers. For the
bollards having the same post diameter, the letter of the alphabet, i.e. A or B, is followed by the nominal
size for the different safe working loads (SWL).
The nominal sizes are: 150, 200, 250A, 250B, 300A, 300B, 350A, 350B, 400A, 400B, 450A, 450B, 500A,
500B, 550A, 550B and 600.
5 Dimensions
The bollards shall have dimensions and particulars in accordance with Tables 1, 2, 3 and 4, and
Figures 1 and 2.
6 Materials
The following materials shall be used for manufacturing the components of the bollards:
— base plates: weldable steel plates having a yield point of not less than 235 N/mm ;
— posts: weldable steel plates having a yield point of not less than 235 N/mm or equivalent steel tubes.
7 Construction
7.1 The posts of the bollards shall be constructed from steel pipes or formed from plate.
7.2 Fins shall be installed to keep the ropes as low as possible so as to reduce the loads to the bollard
posts from the mooring/towing ropes.
7.3 An eye plate for tying the stopping-off rope or chain shall be provided.
7.4 The selection of ship’s mooring fittings and mooring lines should take into account the diameter, D,
of surfaces of mooring fittings that are in contact with the mooring line diameter, d, (D/d ratio) to reduce
or mitigate bend ross of strength.
7.5 The tensile strength of mooring rope may be reduced depending on bend radius (D/d ratio)
through the mooring fittings, in accordance with the rope manufacturer’s guidelines.
8 Manufacturing and inspection
8.1 All surfaces of the bollards, including welded surfaces, sh
...