Ships and marine technology — High holding power balance anchors

This document specifies the design and production requirements, test methods, marking and inspection certificate for high holding power balance anchors (hereinafter referred to as anchors). It is applicable to the design, selection, production and acceptance of high holding power balance anchors.

Navires et technologie maritime — Ancres à grande tenue

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Status
Published
Publication Date
18-Oct-2021
Current Stage
6060 - International Standard published
Start Date
19-Oct-2021
Completion Date
19-Oct-2021
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INTERNATIONAL ISO
STANDARD 24061
First edition
2021-10
Ships and marine technology — High
holding power balance anchors
Navires et technologie maritime — Ancres à grande tenue
Reference number
ISO 24061:2021(E)
© ISO 2021
---------------------- Page: 1 ----------------------
ISO 24061:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

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
© ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 24061:2021(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ..................................................................................................................................................................................... 1

3 Terms and definitions .................................................................................................................................................................................... 1

4 Design .............................................................................................................................................................................................................................. 1

4.1 Structure ...................................................................................................................................................................................................... 1

4.2 Basic specifications and dimensions .................................................................................................................................. 1

4.3 Material ......................................................................................................................................................................................................... 2

5 Production .................................................................................................................................................................................................................. 2

5.1 Visual appearance ............................................................................................................................................................................... 2

5.2 Dimensional tolerance and geometrical tolerance ................................................................................................. 3

5.3 Welding and welding repair ........................................................................................................................................................ 4

5.4 Heat treatment........................................................................................................................................................................................ 4

5.5 Non-destructive test .......................................................................................................................................................................... 4

5.6 Painting ......................................................................................................................................................................................................... 4

5.7 Mass .................................................................................................................................................................................................................. 5

5.8 Balance .......................................................................................................................................................................................................... 5

6 Test methods ............................................................................................................................................................................................................ 5

6.1 Drop test ....................................................................................................................................................................................................... 5

6.2 Proof test ..................................................................................................................................................................................................... 6

6.3 Holding power test .............................................................................................................................................................................. 7

7 Marking ........................................................................................................................................... ............................................................................... 7

8 Certificate .................................................................................................................................................................................................................... 7

Annex A (informative) Anchor structure and dimensions ........................................................................................................... 8

Annex B (normative) Anchor proof test method ..................................................................................................................................11

Annex C (normative) Anchor holding power test method at sea ........................................................................................13

Bibliography .............................................................................................................................................................................................................................16

iii
© ISO 2021 – All rights reserved
---------------------- Page: 3 ----------------------
ISO 24061:2021(E)
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

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

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

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

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.
© ISO 2021 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 24061:2021(E)
Ships and marine technology — High holding power
balance anchors
1 Scope

This document specifies the design and production requirements, test methods, marking and inspection

certificate for high holding power balance anchors (hereinafter referred to as anchors).

It is applicable to the design, selection, production and acceptance of high holding power balance

anchors.
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.

ISO 3828, Shipbuilding and marine structures — Deck machinery — Vocabulary and symbols

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 3828 and the following apply.

ISO and IEC maintain terminology databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
high holding power balance anchor
HHPB anchor

anchor with a rotatory fluke that can be restored back to upright position by gravity once the anchor

is hoisted from the sea bed, and with a holding power of at least twice that of an ordinary stockless

anchor of the same mass
4 Design
4.1 Structure

An anchor is generally composed of a shank, a fluke, a head pin, a lateral pin, a shackle and an anchor

shackle. The typical structure is shown in Annex A.
4.2 Basic specifications and dimensions

Anchors shall be designed as per the quantity required by outfitting. They shall be classified into

different specifications based on the anchor theoretical mass. The corresponding basic dimensions are

shown in Table A.1.
© ISO 2021 – All rights reserved
---------------------- Page: 5 ----------------------
ISO 24061:2021(E)
4.3 Material

4.3.1 The chemical composition of the anchor components shall be as specified in Table 1.

Table 1 — Chemical composition of anchor components
Values in percent (%)
Chemical element content
Component Residual element
C Si Mn S P
Ni Cr Cu Mo total
shackle body, 1,10 to
0,29 0,35 0,035 0,035 - - - - -
shank 1,60
0,50 to
shank, fluke 0,23 0,60 0,04 0,04 0,40 0,30 0,30 0,15 0,80
1,60
head pin, lateral 0,30 to
0,23 0,45 0,035 0,035 0,25 0,25 0,25 0,15 0,80
pin, shackle pin 1,50
All figures are maximum values, in %, except the ranges.

Unless required by the purchaser, the residual elements do not need to be analyzed.

0,04 % Mn may be added to the upper limit for each 0,01 % carbon reduction.

4.3.2 The mechanical properties of anchor components shall be as specified in Table 2.

Table 2 — Mechanical properties of anchor components
Mechanical property
Percentage of
Extension
Tensile strength Yield strength breaking area Impact energy
Component
percentage
reduction
2 2
N/mm N/mm J
shackle body
490 295 22 - 27
shank
shank, fluke,
450 230 22 35 25
shank
head pin, lateral
410 245 25 35 27
pin, shackle pin
All figures are minimum values.

4.3.3 The surface and the inside of cast and forged components of anchors should be free from cracks,

airholes, cratering, cold shuts, scabs and any other defects that may affect the strength.

4.3.4 A Charpy V-notch impact test below 0 °C should be carried out regarding ice zone navigation

requirements. The impact absorbing energy should not be less than 27 J.

4.3.5 The welding material used during the fabrication of the anchor should be compatible with the

parent material.
5 Production
5.1 Visual appearance

Anchor rotary parts should be ground to Ra 25 μm and be able to flexibly rotate around the centre of

gravity. The surface roughness of non-processed parts should be not more than Ra 100 μm.

© ISO 2021 – All rights reserved
---------------------- Page: 6 ----------------------
ISO 24061:2021(E)
5.2 Dimensional tolerance and geometrical tolerance

5.2.1 The permissible dimensional tolerance on each component of the anchor should be ±4 %, and its

maximum value shall not exceed ±20 mm.

5.2.2 The permissible tolerance between the swing angles of the anchor flukes should be ±1°

respectively.

5.2.3 The straightness deviation of the anchor shank should not be more than 3 mm for a length

within 1 m.
5.2.4 The anchor assembling tolerances should meet the following provisions.

a) Any side clearance between the shackle and the shank should be as specified in Table 3.

Table 3 — Clearance between shackle and shank
Nominal mass of the anchor Clearance value
t mm
≤ 3 ≤ 3
>3 to ≤5 ≤ 4
>5 to ≤7 ≤ 6
> 7 ≤ 12

b) When the diameter of the shackle pin is less than or equal to 57 mm, the diameter difference

between the shackle pin and the shackle pin hole shall not be more than 0,5 mm. When the diameter

of the shackle pin is more than 57 mm, the diameter difference between the shackle pin and the

shackle pin hole should not be more than 1,0 mm.

c) The clearance difference between the pin, the shackle pin and the anchor shank hole should not be

more than 1,0 mm.

d) The length of the head pin shall be able to prevent the longitudinal movement of the anchor. Its

clearance shall be no more than 1 % of the pin slot length.

e) The lateral inclination of the anchor shank shall not exceed 3°. See Figure 1.

© ISO 2021 – All rights reserved
---------------------- Page: 7 ----------------------
ISO 24061:2021(E)
Figure 1 — Lateral inclination of the anchor
5.3 Welding and welding repair

Allowable defects should be repaired only after being evaluated through a qualified technical process.

Stress relieving should be implemented.
5.4 Heat treatment

The anchor shank, fluke and shackle should be treated with a normalizing and tempering process, with

a tempering temperature of not less than 600 °C.
5.5 Non-destructive test

The surface of cast and forged parts after machining shall be subject to a non-destructive test (NDT).

The test for anchor cast components should be conducted in accordance with IACS REC. 69; the test for

anchor forged parts should be conducted in accordance with IACS REC. 68.
5.6 Painting

Anchors should be painted with two coats, of asphalt and black paint; other paints can be used if

mutually agreed.
© ISO 2021 – All rights reserved
---------------------- Page: 8 ----------------------
ISO 24061:2021(E)
5.7 Mass

The permissible deviation of the weighted mass relative to the nominal mass should be within 7 % to

-3 %.
5.8 Balance

The fluke should be able to be restored back to its upright position automatically when the anchor is

fully hanged. The alignment of the two fluke bills should not exceed any lateral plane of the anchor

shank.
6 Test methods
6.1 Drop test

Anchors should be subject to a drop inspection, where the anchor is dropped from a height of 4,0 m; the

anchor should be free from crack defects. The detailed procedures are as follows.

a) Being hung horizontally and vertically (head-down) respectively (see Figure 2), the shank and

anchor fluke are dropped from a height of 4,0 m onto a steel lining (with a thickness of not less than

50 mm) fixed onto a solid foundation.

b) After the drop inspection, the anchor flukes and shank should be lifted off the ground with a non-

metal rope and subject to a hammering test with a hammer
...

INTERNATIONAL ISO
STANDARD 24061
First edition
Ships and marine technology — High
holding power balance anchors
PROOF/ÉPREUVE
Reference number
ISO 24061:2021(E)
ISO 2021
---------------------- Page: 1 ----------------------
ISO 24061:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

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 PROOF/ÉPREUVE © ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 24061:2021(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Design .............................................................................................................................................................................................................................. 1

4.1 Structure ....................................................................................................................................................................................................... 1

4.2 Basic specifications and dimensions .................................................................................................................................... 1

4.3 Material ......................................................................................................................................................................................................... 2

5 Production .................................................................................................................................................................................................................. 2

5.1 Visual appearance ................................................................................................................................................................................ 2

5.2 Dimensional tolerance and geometrical tolerance .................................................................................................. 3

5.3 Welding and welding repair ........................................................................................................................................................ 4

5.4 Heat treatment ........................................................................................................................................................................................ 4

5.5 Non-destructive test ........................................................................................................................................................................... 4

5.6 Painting .......................................................................................................................................................................................................... 4

5.7 Mass .................................................................................................................................................................................................................. 5

5.8 Balance ........................................................................................................................................................................................................... 5

6 Test methods ............................................................................................................................................................................................................. 5

6.1 Drop test ....................................................................................................................................................................................................... 5

6.2 Proof test ...................................................................................................................................................................................................... 6

6.3 Holding power test .............................................................................................................................................................................. 7

7 Marking .......................................................................................................................................................................................................................... 7

8 Certificate ..................................................................................................................................................................................................................... 7

Annex A (informative) Anchor structure and dimensions ............................................................................................................. 8

Annex B (normative) Anchor proof test method ...................................................................................................................................11

Annex C (normative) Anchor holding power test method at sea .........................................................................................13

Bibliography .............................................................................................................................................................................................................................16

© ISO 2021 – All rights reserved PROOF/ÉPREUVE iii
---------------------- Page: 3 ----------------------
ISO 24061:2021(E)
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

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

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

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

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 PROOF/ÉPREUVE © ISO 2021 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 24061:2021(E)
Ships and marine technology — High holding power
balance anchors
1 Scope

This document specifies the design and production requirements, test methods, marking and inspection

certificate for high holding power balance anchors (hereinafter referred to as anchors).

It is applicable to the design, selection, production and acceptance of high holding power balance

anchors.
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.

ISO 3828, Shipbuilding and marine structures — Deck machinery — Vocabulary and symbols

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 3828 and the following 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 https:// www .electropedia .org/
3.1
high holding power balance anchor
HHBP anchor

anchor with a rotatory fluke that can be restored back to upright position by gravity once the anchor

is hoisted from the sea bed, and with a holding power of at least twice that of an ordinary stockless

anchor of the same mass
4 Design
4.1 Structure

An anchor is generally composed of a shank, a fluke, a head pin, a lateral pin, a shackle and an anchor

shackle. The typical structure is shown in Annex A.
4.2 Basic specifications and dimensions

Anchors shall be designed as per the quantity required by outfitting. They shall be classified into

different specifications based on the anchor theoretical mass. The corresponding basic dimensions are

shown in Table A.1.
© ISO 2021 – All rights reserved PROOF/ÉPREUVE 1
---------------------- Page: 5 ----------------------
ISO 24061:2021(E)
4.3 Material

4.3.1 The chemical composition of the anchor components shall be as specified in Table 1.

Table 1 — Chemical composition of anchor components
Values in percent (%)
Chemical element content
Component Residual element
C Si Mn S P
Ni Cr Cu Mo total
shackle body, 1,10 to
0,29 0,35 0,035 0,035 - - - - -
shank 1,60
0,50 to
shank, fluke 0,23 0,60 0,04 0,04 0,40 0,30 0,30 0,15 0,80
1,60
head pin, lateral 0,30 to
0,23 0,45 0,035 0,035 0,25 0,25 0,25 0,15 0,80
pin, shackle pin 1,50
All figures are maximum values, in %, except the ranges.

Unless required by the purchaser, the residual elements do not need to be analyzed.

0,04 % Mn may be added to the upper limit for each 0,01 % carbon reduction .

4.3.2 The mechanical properties of anchor components shall be as specified in Table 2.

Table 2 — Mechanical properties of anchor components
Mechanical property
Percentage of
Extension
Tensile strength Yield strength breaking area Impact energy
Component
percentage
reduction
2 2
N/mm N/mm J
shackle body
490 295 22 - 27
shank
shank, fluke,
450 230 22 35 25
shank
head pin, lateral
410 245 25 35 27
pin, shackle pin
All figures are minimum values.

4.3.3 The surface and the inside of cast and forged components of anchors should be free from cracks,

airholes, cratering, cold shuts, scabs and any other defects that may affect the strength.

4.3.4 A Charpy V-notch impact test below 0 °C should be carried out regarding ice zone navigation

requirements. The impact absorbing energy should not be less than 27 J.

4.3.5 The welding material used during the fabrication of the anchor should be compatible with the

parent material.
5 Production
5.1 Visual appearance

Anchor rotary parts should be ground to Ra 25 μm and be able to flexibly rotate around the centre of

gravity. The surface roughness of non-processed parts should be not more than Ra 100 μm.

2 PROOF/ÉPREUVE © ISO 2021 – All rights reserved
---------------------- Page: 6 ----------------------
ISO 24061:2021(E)
5.2 Dimensional tolerance and geometrical tolerance

5.2.1 The permissible dimensional tolerance on each component of the anchor should be ±4 %, and its

maximum value shall not exceed ±20 mm.

5.2.2 The permissible tolerance between the swing angles of the anchor flukes should be ±1°

respectively.

5.2.3 The straightness deviation of the anchor shank should not be more than 3 mm for a length within

1 m.
5.2.4 The anchor assembling tolerances should meet the following provisions.

a) Any side clearance between the shackle and the shank should be as specified in Table 3.

Table 3 — Clearance between shackle and shank
Nominal mass of the anchor Clearance value
t mm
≤ 3 ≤ 3
>3 to ≤5 ≤ 4
>5 to ≤7 ≤ 6
> 7 ≤ 12

b) When the diameter of the shackle pin is less than or equal to 57 mm, the diameter difference

between the shackle pin and the shackle pin hole shall not be more than 0,5 mm. When the diameter

of the shackle pin is more than 57 mm, the diameter difference between the shackle pin and the

shackle pin hole should not be more than 1,0 mm.

c) The clearance difference between the pin, the shackle pin and the anchor shank hole should not be

more than 1,0 mm.

d) The length of the head pin shall be able to prevent the longitudinal movement of the anchor. Its

clearance shall be no more than 1 % of the pin slot length.

e) The lateral inclination of the anchor shank shall not exceed 3°. See Figure 1.

© ISO 2021 – All rights reserved PROOF/ÉPREUVE 3
---------------------- Page: 7 ----------------------
ISO 24061:2021(E)
Figure 1 — Lateral inclination of the anchor
5.3 Welding and welding repair

Allowable defects should be repaired only after being evaluated through a qualified technical process.

Stress relieving should be implemented.
5.4 Heat treatment

The anchor shank, fluke and shackle should be treated with a normalizing and tempering process, with

a tempering temperature of not less than 600 °C.
5.5 Non-destructive test

The surface of cast and forged parts after machining shall be subject to a non-destructive test (NDT).

The test for anchor cast components should be conducted in accordance with IACS REC. 69; the test for

anchor forged parts should be conducted in accordance with IACS REC. 68.
5.6 Painting

Anchors should be painted with 2 coats, of asphalt and black paint; other paints can be used if mutually

agreed.
4 PROOF/ÉPREUVE © ISO 2021 – All rights reserved
---------------------- Page: 8 ----------------------
ISO 24061:2021(E)
5.7 Mass

The permissible deviation of the weighted mass relative to the nominal mass should be within 7 % to

-3 %.
5.8 Balance

The fluke should be able to be restored back to its upright position automatically when the anchor is

fully hanged. The alignment of the two fluke bills should not exceed any lateral plane of the anchor

shank.
6 Test methods
6.1 Drop test

Anchors should be subject to a drop inspection, where the anchor is dropped from a height of 4,0 m; the

anchor should be free from crack defects. The detailed procedures are as follows.

a) Being hung horizontally and vertically (head-down) respectively (see Figure 2), the shank and

anchor fluke are dropped from a height of 4,0 m onto a steel lining (with a thickness of not less than

50 mm) fixed onto a solid foundation.

b) After the drop inspection, the anchor flukes and shank should be lifted off the ground with a non-

metal rope and subject to a hammering test with a hammer weighing 3 kg to 7 kg.
c) Check whether the sound is clear or not. If there is a
...

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