Corrosion of metals and alloys -- Guidelines for the corrosion testing of metals and alloys exposed in deep-sea water

This document gives guidelines for the corrosion testing of metals and alloys exposed in deep-sea water, including the selection of the test site, components and assembly of the test system, specimen preparation, testing procedure, evaluation after the retrieval from exposure sites and test report. This document is applicable to the general corrosion exposure testing of metals and alloys as well as localized corrosion tests such as stress corrosion cracking (SCC) testing, galvanic corrosion testing and crevice corrosion testing of specimens exposed in deep-sea water. Testing with exposure in deep sea of other materials such as composites and elastomers can also be carried out with reference to these guidelines, but the evaluation of these materials after the retrieval is different from that of metals and alloys. This document does not include the performance testing of sacrificial anodes for cathodic protection in the field of deep sea, which can be conducted using specified testing cells and equipment in the deep-sea exposure. However, this guidance can also provide useful information as reference for conducting performance testing of sacrificial anodes in deep-sea water.

Corrosion des métaux et alliages -- Lignes directrices pour les essais de corrosion des métaux et alliages exposés en eau profonde

General Information

Status
Published
Publication Date
03-Nov-2020
Current Stage
6060 - International Standard published
Start Date
08-Oct-2020
Completion Date
04-Nov-2020
Ref Project

Buy Standard

Standard
ISO 23226:2020 - Corrosion of metals and alloys -- Guidelines for the corrosion testing of metals and alloys exposed in deep-sea water
English language
11 pages
sale 15% off
Preview
sale 15% off
Preview
Draft
ISO/FDIS 23226:Version 24-apr-2020 - Corrosion of metals and alloys -- Guidelines for the corrosion testing of metals and alloys exposed in deep-sea water
English language
11 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (sample)

INTERNATIONAL ISO
STANDARD 23226
First edition
2020-11
Corrosion of metals and alloys —
Guidelines for the corrosion testing
of metals and alloys exposed in deep-
sea water
Corrosion des métaux et alliages — Lignes directrices pour les essais
de corrosion des métaux et alliages exposés en eau profonde
Reference number
ISO 23226:2020(E)
ISO 2020
---------------------- Page: 1 ----------------------
ISO 23226:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© 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
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 © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 23226:2020(E)
Contents Page

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

Introduction ..................................................................................................................................................................................................................................v

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

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

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

4 Selection of test site ........................................................................................................................................................................................... 2

5 Assembly and components ........................................................................................................................................................................ 2

5.1 Assembly ...................................................................................................................................................................................................... 2

5.2 Test rack ........................................................................................................................................................................................................ 4

5.3 Other parts and equipment .......................................................................................................................................................... 4

5.3.1 Equipment for environmental monitoring ................................................................................................ 4

5.3.2 Release system ................................................................................................................................................................... 4

5.3.3 Surface water location unit ..................................................................................................................................... 4

5.3.4 Under water location unit ........................................................................................................................................ 4

5.3.5 Buoys .......................................................................................................................................................................................... 4

5.3.6 Connecting accessories .............................................................................................................................................. 5

5.3.7 Tension rope ........................................................................................................................................................................ 5

5.3.8 Batteries .................................................................................................................................................................................. 5

5.3.9 Anchor system ................................................................................................................................................................... 5

6 Specimens .................................................................................................................................................................................................................... 5

6.1 Preparation of specimens .............................................................................................................................................................. 5

6.2 Mount of specimens ............................................................................................................................................................................ 6

6.3 Packaging and transportation of specimens ................................................................................................................. 7

7 Testing procedure ............................................................................................................................................................................................... 8

8 Evaluation of specimens ............................................................................................................................................................................... 8

9 Test report ................................................................................................................................................................................................................... 9

Bibliography .............................................................................................................................................................................................................................11

© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 23226:2020(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 156, Corrosion of metals and alloys.

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
---------------------- Page: 4 ----------------------
ISO 23226:2020(E)
Introduction

With the developments of the offshore oil and gas industry, the activities of exploration and production

of oil and gas have been extended into deep sea. Many subsea equipment and systems for oil/gas

production have been deployed in deep-sea water. There are also some instruments placed in the

subsea for environmental observation and scientific exploration. Corrosion is a crucial problem for

these valuable installations because it seriously affects the performance, reliability and safety of these

equipment and systems.

This document gives guidance on the corrosion testing of metals and alloys exposed in deep-sea water.

The testing can be conducted based on the specified conditions and procedures, and meaningful

comparisons may be made for different tests.
© ISO 2020 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 23226:2020(E)
Corrosion of metals and alloys — Guidelines for the
corrosion testing of metals and alloys exposed in deep-
sea water
1 Scope

This document gives guidelines for the corrosion testing of metals and alloys exposed in deep-sea

water, including the selection of the test site, components and assembly of the test system, specimen

preparation, testing procedure, evaluation after the retrieval from exposure sites and test report.

This document is applicable to the general corrosion exposure testing of metals and alloys as well as

localized corrosion tests such as stress corrosion cracking (SCC) testing, galvanic corrosion testing and

crevice corrosion testing of specimens exposed in deep-sea water.

Testing with exposure in deep sea of other materials such as composites and elastomers can also be

carried out with reference to these guidelines, but the evaluation of these materials after the retrieval

is different from that of metals and alloys.

This document does not include the performance testing of sacrificial anodes for cathodic protection in

the field of deep sea, which can be conducted using specified testing cells and equipment in the deep-

sea exposure. However, this guidance can also provide useful information as reference for conducting

performance testing of sacrificial anodes in deep-sea water.
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 8044, Corrosion of metals and alloys — Vocabulary
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 8044 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 http:// www .electropedia .org/
3.1
deep-sea water

sea water zone with a depth generally ranging from 200 meters to thousands of meters

Note 1 to entry: Deep-sea water has a corrosive environment with parameters such as temperature, salinity,

dissolved oxygen content, microorganism and biofouling that are quite different from those in surface sea water.

3.2
test site
location where corrosion tests exposed in deep sea are performed
© ISO 2020 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO 23226:2020(E)
3.3
service environment
environment for which the corrosion data is required
3.4
test rack
structure within which the specimens or modules of specimens are housed
4 Selection of test site

The selection of test site is very important for corrosion tests exposed in deep-sea water because the

environment can vary considerably at different test sites.

The selected test site should be suitable for conducting the testing. Generally, the test site should be

selected with consideration of the following requirements.

a) The environmental parameters of the test site should be representative of the service environment.

b) The seabed at the test site should be generally flat without protruding rocks or deep traps, and the

slope should be smaller than 3 %. The sediment at the seabed should be stable.

c) The test site should be in an open area, where sea water can flow freely without being blocked in a

valley or a basin.

d) The test site should be in a place where the assembly will not be damaged by shipping, trawling or

other foreseeable activities. Also, the as-set assembly at the test site should not affect the safety of

foreseeable activities such as shipping and trawling.

e) The test site should be selected in consideration of relevant rules and regulations. The risks of

environmental impact and safety should be assessed prior to any activity is undertaken.

5 Assembly and components
5.1 Assembly
5.1.1 The assembly should have at least the following functions:
a) carrying the specimens reliably during the test in deep sea;

b) gathering the key environmental parameters related to corrosion at the test site;

c) locating the assembly in deep sea;
d) retrieving the assembly at the end of testing.
5.1.2 The assembly is mainly composed of the following parts:
a) buoy(s);
b) tension rope;
c) test rack(s);
d) release system;
e) environmental parameter collection and storage unit;
f) surface water location unit and under water location unit;
g) anchor system.
2 © ISO 2020 – All rights reserved
---------------------- Page: 7 ----------------------
ISO 23226:2020(E)

5.1.3 The typical assembly of test system is shown in Figure 1. There may be a single test rack in the

assembly. Alternatively, there may be several test racks deployed at different elevations on the assembly.

This assembly with multiple test racks is longer and more complicated than the assembly with only one

test rack.
Key
1 top-of-string buoy A upper test rack
2 tension rope B middle test rack
3 environmental parameter collection and storage unit C lower test rack
4 tension rope
5 buoy
6 bottom-of-string buoy
7 release system
8 coupling between release system and anchor system
9 & 10 anchor system

Figure 1 — Diagram of a typical assembly of test system applied in deep-sea water

5.1.4 The assembly should be designed carefully to have high reliability and safety, and to be easy for

the operation of deployment and retrieval. It should be fixed at the test site with an anchor system. The

location of the test racks in the assembly should be determined according to the depth of sea water at

which the specimens are expected to be exposed. The dimensions of the test racks should be able to

contain all the specimens for the testing without interference. The buoys should be designed based on

© ISO 2020 – All rights reserved 3
---------------------- Page: 8 ----------------------
ISO 23226:2020(E)

the mass of the whole assembly to provide enough buoyancy to bring the assembly back to the surface

when released from the anchor system. The design of the assembly should be carried out by a suitably

qualified person.

5.1.5 The end user (and qualified personnel) is responsible for the test assembly installation,

implementation and retrieval. Checks of the set up should be carried out once installed.

5.2 Test rack

5.2.1 Test rack may be made of corrosion resistant materials with proven performance in deep water

environments. Alternatively, the test rack may be made of carbon steel provided it is protected from

corrosion using coating and sacrificial anode cathodic protection, which should be carefully designed to

avoid interference on specimens.

5.2.2 The test rack should have mechanical stability for the long-time service in deep-sea water.

It should be suitable for the particular types of specimen to be deployed. Refer to 6.1 for guidance

appropriate to different types of specimen.
5.3 Other parts and equipment
5.3.1 Equipment for environmental monitoring

Equipment for measuring environmental parameters should be located in or close to the test rack,

so that environmental data collected is representative of the conditions to which the specimens are

exposed.

Equipment is commercially available for the measurement of environmental parameters, such as oxygen

concentration, temperature, conductivity of sea water, hydrostatic pressure, sea current velocity, pH

value, etc., to characterize the local environment during the whole deployment period. Sensors to

measure other parameters, such as SO and H S concentration, may also be installed depending on the

2 2
requirements of testing.

The equipment should be pressure-proof and have low electrical energy consumption. The data

gathered will be stored automatically, so that they can be read out after the retrieval.

5.3.2 Release system

The controllable retrieval system is based on the release installed in the assembly, which can receive

the signal from the surface vessel. When receiving the command for releasing, the system can

automatically separate the test racks and buoys from the anchor system on the seabed. The buoys will

bring the test rack and the equipment back to the surface. It is recommended that two release units in

parallel configuration should be fixed in the assembly to enhance reliability for the retrieval.

5.3.3 Surface water location unit

Surface water location equipment (e.g. radio beacons) may be incorporated in the assembly to allow it

to be located after returning to the surface with release from the anchor system.

5.3.4 Under water location unit

Under water location equipment (e.g. SONAR) should be incorporated in the assembly to allow it to be

located in situ. The release system generally contains SONAR.
5.3.5 Buoys

Buoys should be suitable for the service environment. Note that glass floating spheres or syntactic

foams comprising microspheres embedded in a plastic matrix
...

DRAFT INTERNATIONAL STANDARD
ISO/DIS 23226
ISO/TC 156 Secretariat: SAC
Voting begins on: Voting terminates on:
2019-11-06 2020-01-29
Corrosion of metals and alloys — Guidelines for corrosion
testing of metals and alloys exposed in deep sea water
ICS: 77.060
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
This document is circulated as received from the committee secretariat.
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 23226:2019(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. ISO 2019
---------------------- Page: 1 ----------------------
ISO/DIS 23226:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019

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
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/DIS 23226:2019(E)
Contents Page

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

Introduction ..................................................................................................................................................................................................................................v

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

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

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Selection of test site ........................................................................................................................................................................................... 2

5 Assembly and components ........................................................................................................................................................................ 2

5.1 Assembly ...................................................................................................................................................................................................... 2

5.2 Test rack ........................................................................................................................................................................................................ 3

5.3 Other parts and equipment .......................................................................................................................................................... 3

5.3.1 Equipment for environmental monitoring ................................................................................................ 3

5.3.2 Release system ................................................................................................................................................................... 5

5.3.3 Surface water location unit ..................................................................................................................................... 5

5.3.4 Under water location unit ........................................................................................................................................ 5

5.3.5 Buoys .......................................................................................................................................................................................... 5

5.3.6 Connecting accessories .............................................................................................................................................. 5

5.3.7 Tension rope ........................................................................................................................................................................ 5

5.3.8 Batteries .................................................................................................................................................................................. 5

5.3.9 Anchor system ................................................................................................................................................................... 5

6 Specimens .................................................................................................................................................................................................................... 5

6.1 Preparation of specimens .............................................................................................................................................................. 5

6.2 Mount of specimens ............................................................................................................................................................................ 6

6.3 Package and transportation of specimens ...................................................................................................................... 7

7 Testing procedure ............................................................................................................................................................................................... 8

8 Evaluation of specimens ............................................................................................................................................................................... 8

9 Test report ................................................................................................................................................................................................................... 9

© ISO 2019 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/DIS 23226:2019(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 should 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 on 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 the following

URL: www .iso .org/iso/foreword .html.

This document was prepared by Technical Committee ISO/TC 156, Corrosion of Metals and Alloys.

iv © ISO 2019 – All rights reserved
---------------------- Page: 4 ----------------------
ISO/DIS 23226:2019(E)
Introduction

With the development of offshore oil and gas industry, the exploration and production of oil and gas has

moved into deep sea. Many subsea equipment and systems for oil/gas production have been deployed in

the deep-sea water. There are also some instruments placed in subsea for environmental observation

and scientific exploration. Corrosion is a crucial problem for these valuable installations because it

affects seriously the performance, the reliability and the safety of these equipment and systems.

This international standard gives guidance on the corrosion testing of metals and alloys exposed in

deep sea water, including selection of test site, components and assembly of test system, specimen

preparation, testing procedure, evaluation after the retrieval from exposure sites and test report. So,

the testing can be conducted based on the specified conditions and procedures, and the meaningful

comparisons may be made for different tests.

This standard applies to the general corrosion exposure testing of metals and alloys as well as local

corrosion tests such as galvanic corrosion test, crevice corrosion test, stress corrosion cracking (SCC)

test of specimens exposed in deep sea water.
© ISO 2019 – All rights reserved v
---------------------- Page: 5 ----------------------
DRAFT INTERNATIONAL STANDARD ISO/DIS 23226:2019(E)
Corrosion of metals and alloys — Guidelines for corrosion
testing of metals and alloys exposed in deep sea water
1 Scope

This international standard gives guidance on the corrosion testing of metals and alloys exposed in

deep sea water, including selection of test site, components and assembly of test system, specimen

preparation, testing procedure, evaluation after the retrieval from exposure sites and test report.

This standard applies to the general corrosion exposure testing of metals and alloys as well as localized

corrosion tests such as stress corrosion cracking (SCC) testing, galvanic corrosion testing and crevice

corrosion testing of specimens exposed in deep sea water.

Testing with exposure in deep sea of other materials such as composites and elastomers can also be

carried out with reference to these guidelines, but the evaluation of these materials after the retrieval

is different from that of metals and alloys.

This standard does not include the performance testing of sacrificial anodes for cathodic protection in

the field of deep sea, which can be conducted using specified testing cells and equipment in the deep-sea

exposure. However, this guidance can also provide useful information as reference for the conducting

of performance testing of sacrificial anodes in deep sea water.
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 8044, Corrosion of metals and alloys — Basic terms and definitions

ISO 8407, Corrosion of metals and alloys — Removal of corrosion products from corrosion test specimens

ISO 7539-2, Corrosion of metals and alloys — Stress corrosion testing — Part 2: Preparation and use of

bent-beam specimens

ISO 7539-3, Corrosion of metals and alloys — Stress corrosion testing — Part 3: Preparation and use of

U-bend specimens

ISO 7539-5, Corrosion of metals and alloys — Stress corrosion testing — Part 5: Preparation and use of

C-ring specimens

ISO 7539-8, Corrosion of metals and alloys — Stress corrosion testing — Part 8: Preparation and use of

specimens to evaluate weldments

ISO 11306, Corrosion of metals and alloys — Guidelines for exposing and evaluating metals and alloys in

surface sea water
ISO 11463, Corrosion of metals and alloys — Evaluation of pitting corrosion

ISO 18070, Corrosion of metals and alloys — Crevice corrosion formers with disc springs for flat specimens

or tubes made from stainless steel

ASTM G71, Standard guide for conducting and evaluating galvanic corrosion tests in electrolytes

ASTM G78, Standard guide for crevice corrosion testing of iron-base and nickel-base stainless alloys in

seawater and other chloride-containing aqueous environments
© ISO 2019 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO/DIS 23226:2019(E)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 8044 and the following apply.

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

— ISO Online browsing platform: available at http: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
deep sea water

sea water zone with depth generally ranging from several hundred to thousands of meters

Note 1 to entry: Deep sea has a corrosive environment with parameters such as temperature, salinity, dissolved

oxygen content of sea water quite different from those in surface sea water.
3.2
test site
location where corrosion tests exposed in deep sea are performed
3.3
service environment
environment for which the corrosion data is required
3.4
test rack
structure within which the specimens or modules of specimens are housed
4 Selection of test site

The selection of test site is very important for corrosion tests exposed in deep sea water because the

environment may vary obviously at different test sites.

The selected test site should be suitable for conducting the testing. Generally, the test site should be

selected with consideration of the following requirements:

a) The environmental parameters of the test site should be representative of the service environment.

b) The seabed at the test site should be generally flat without protruding rocks or deep traps, and the

slope should be smaller than 3%. The sediment at the seabed should be stable.

c) The test site should be in an open area, where seawater can flow freely without being blocked in a

valley or a basin.

d) The test site should be in the place where the assembly will not be damaged by shipping, trawling

or other foreseeable activities. Also, the as-set assembly at the test site should not affect the safety

of foreseeable activities such as shipping and trawling.
5 Assembly and components
5.1 Assembly
5.1.1 The assembly should have at least the following functions:
a) carrying the specimens reliably during the test in the deep sea

b) gathering the key environmental parameters related to corrosion at the test site;

c) locating the assembly in the deep sea;
2 © ISO 2019 – All rights reserved
---------------------- Page: 7 ----------------------
ISO/DIS 23226:2019(E)
d) retrieving the assembly at the end of testing.
5.1.2 The assembly is mainly composed of the following parts:
a) buoy(s)
b) tension rope
c) test rack(s)
d) release system
e) environmental parameter collection and storage unit
f) surface water location unit and under water location unit
g) anchor system

5.1.3 The typical assembly of test system is shown in the diagram of Figure 1. There may be a single

test rack in the assembly. Alternatively, there may be several test racks deployed at different elevations on

the assembly. This assembly with multiple test racks is longer and more complicated than the assembly

with only one test rack.

5.1.4 The assembly should be designed carefully to have high reliability and safety, and to be easy for

the operation of deployment and retrieval. It should be fixed at the test site with an anchor system. The

assembly should have enough buoyancy to bring it to the surface when released from the anchor system.

5.2 Test rack

5.2.1 Test rack may be made of corrosion resistant materials with proven performance in deep

water environments. Alternatively test rack may be made of carbon steel provided it is protected from

corrosion using coating and sacrificial anode cathodic protection, which should be carefully designed to

avoid interference on specimens.

5.2.2 The test rack should have mechanical stability for the long-time service in the deep-sea water. It

should be suitable for the particular types of specimen to be deployed. Refer to clause 6.1 for guidance

appropriate to different types of specimen.
5.3 Other parts and equipment
5.3.1 Equipment for environmental monitoring

Equipment for measuring environmental parameters should be located in or close to the test rack,

so that environmental data
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.