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 document 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).

ISO draws attention to the possibility that the implementation of this document may involve the use of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s) which may be required to implement this document. However, implementers are cautioned that this may not represent the latest information, which may be obtained from the patent database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.

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 67, Oil and gas industries including lower carbon energy, Subcommittee SC 2, Pipeline transportation systems.

This second edition cancels and replaces the first edition ( ISO 21809-4:2009 ), which has been technically revised.

The main changes are as follows:

inclusion of a qualification scheme;
harmonization with the other parts of the ISO 21809 series;
changes to Table 8;
changes to Table 9;
changes to Annex G.

A list of all parts in the ISO 21809 series can be found on the ISO website.

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.

1 Scope

This document specifies the requirements for qualification, application, inspection, testing, handling and storage of materials for plant application of two-layer polyethylene coatings (2-layer PE) applied externally for the corrosion protection of bare steel pipe for use in pipeline transportation systems for oil and gas industries as defined in ISO 13623 .

NOTE Pipes coated in accordance with this document are considered suitable for additional protection by means of cathodic protection.

2 Normative references

3 Terms and definitions

4 Symbols and abbreviated terms

4.1 Symbols

4.2 abbreviated terms

5 General requirements

5.1 Rounding

5.2 Conformity to requirements

6 Information supplied by the purchaser

6.1 General information

6.2 Additional information

7 Coating classification

7.1 General

7.2 Coating systems

7.3 Coating thickness classes

8 Materials

8.1 Pipe

8.2 Coating materials

8.3 Packaging

8.4 Storage and handling of coating materials

9 Qualification processes

9.1 General

9.2 Qualification scheme

9.3 Coating qualification

10 Application of coating

10.1 General

10.2 Surface preparation

10.3 Coating application

11 Qualification of coating application and coating system

11.1 General

11.2 Application procedure specification (APS)

11.3 Inspection and testing plan (ITP)

11.4 Procedure qualification trial (PQT)

11.5 Coating system qualification (CSQ)

11.6 Pre-production trial (PPT)

11.7 Inspection and testing during production

11.8 Inspection and testing

11.9 Testing of the applied coating

11.10 Test results

12 Repair of coated pipe

12.1 Repair

12.2 Stripping and recoating

13 Markings

13.1 General

13.2 Required markings

14 Handling and storage in the coating area

14.1 Handling

14.2 Storage

15 Test reports and inspection certificates

15.1 General

15.2 Common requirements for reports

15.3 Specific requirements for test reports

15.4 Specific requirements for sampling reports

15.5 Reporting statements of conformity

15.6 Reporting opinions and interpretations

15.7 Amendments to reports

Bibliography