Ships and marine technology - Escorting and pull-back system for tankers

This document specifies the technical requirements and test methods for escorting and pull-back system for tankers. This document is applicable to the escorting and pull-back system for tankers not less than 20 000 deadweight tonnes (DWT).

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General Information

Status
Published
Publication Date
11-Oct-2022
Current Stage
6060 - International Standard published
Start Date
12-Oct-2022
Due Date
09-Apr-2023
Completion Date
12-Oct-2022

Overview

ISO 4827:2022 - Ships and marine technology: Escorting and pull-back system for tankers specifies technical requirements and test methods for escorting and pull-back fittings installed on tankers of 20 000 DWT or more. It defines design arrangements, manufacturing materials, strength and material testing, and marking requirements for critical fittings-primarily chocks and strong points-used to connect tuglines for escorting and pulling operations.

Key topics and technical requirements

  • Applicability: Escorting and pull-back systems for tankers ≥ 20 000 deadweight tonnes (DWT).
  • Design arrangement: Minimum distance from strong point to chock L ≥ 4.0 m to ensure proper positioning of towing eye splice (exceptions for emergency towing arrangements noted).
  • Chock requirements:
    • Minimum closed-type opening: ≥ 600 mm width × ≥ 300 mm height.
    • Strength to accommodate towline angles up to ±90° horizontally and 30° vertically downward.
    • Minimum Safe Working Load (SWL) and corresponding test loads:
      • 20 000 ≤ DWT < 50 000: 1 000 kN (≈102 t) SWL
      • DWT ≥ 50 000: 2 000 kN (≈204 t) SWL
    • Safety factor on yield: minimum 2.0 × SWL.
  • Strong point requirements:
    • Configuration and loading consistent with the matching chock.
    • Minimum dimensions for profile features: diameter D ≥ 600 mm, height H ≥ 300 mm.
    • Combined designs permitted when also used as aft emergency towing arrangement.
  • Materials and workmanship: Acceptable materials include weldable cast steel, forged steel, or rolled steel. Products must be free from defects (cracks, sand holes, pores).
  • Testing methods:
    • Material inspections: physical/chemical tests; magnetic particle inspection for castings; ultrasonic detection for forgings (grade II).
    • Weld inspections: ultrasonic testing for main welds; welds must be smooth and defect-free.
    • Strength test: apply test load for 1 minute, followed by inspection (magnetic particle) to verify no critical defects.
  • Marking: Chocks and strong points must be clearly marked with their SWL in tonnes (e.g., SWL102t) where it remains visible during operation.

Applications and users

This standard is intended for:

  • Ship designers, naval architects and shipyards specifying or installing escorting and pull-back systems.
  • OEMs and manufacturers of chocks and strong points.
  • Classification societies, shipowners, operators and port/tug operators assessing equipment compliance.
  • Surveyors and inspectors performing material and strength testing.

Practical uses include specifying safe fittings for escort/tug operations, ensuring compatibility with tuglines, and providing uniform test and marking practices for tanker safety and operational reliability.

Related standards and guidance

  • ISO 4827:2022 contains no normative references. Users should also consult relevant classification society rules, vessel-specific towing emergency arrangements, and applicable IMO guidance for escorting and towage operations.
Standard

ISO 4827:2022 - Ships and marine technology — Escorting and pull-back system for tankers Released:12. 10. 2022

English language
7 pages
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Frequently Asked Questions

ISO 4827:2022 is a standard published by the International Organization for Standardization (ISO). Its full title is "Ships and marine technology - Escorting and pull-back system for tankers". This standard covers: This document specifies the technical requirements and test methods for escorting and pull-back system for tankers. This document is applicable to the escorting and pull-back system for tankers not less than 20 000 deadweight tonnes (DWT).

This document specifies the technical requirements and test methods for escorting and pull-back system for tankers. This document is applicable to the escorting and pull-back system for tankers not less than 20 000 deadweight tonnes (DWT).

ISO 4827:2022 is classified under the following ICS (International Classification for Standards) categories: 47.020.50 - Deck equipment and installations. The ICS classification helps identify the subject area and facilitates finding related standards.

ISO 4827:2022 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

Standards Content (Sample)


INTERNATIONAL ISO
STANDARD 4827
First edition
2022-10
Ships and marine technology —
Escorting and pull-back system for
tankers
Reference number
© ISO 2022
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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Technical requirements . 1
4.1 Design arrangement of escorting and pull-back system for tankers . 1
4.2 Configuration and design manufacturing requirements for escorting and pull-
back system for tankers . 2
4.2.1 Chock . 2
4.2.2 Strong point . 3
5 Test method . 5
5.1 Chock . 5
5.1.1 Material test . 5
5.1.2 Strength test . 5
5.2 Strong point . 6
5.2.1 Material test . 6
5.2.2 Strength test . 6
6 Markings . 7
iii
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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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
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
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expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology,
Subcommittee SC 4, Outfitting and deck machinery.
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
INTERNATIONAL STANDARD ISO 4827:2022(E)
Ships and marine technology — Escorting and pull-back
system for tankers
1 Scope
This document specifies the technical requirements and test methods for escorting and pull-back
system for tankers.
...

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