GB/T 46429.2-2025Petroleum, petrochemical and natural gas industries - External corrosion protection of risers by coatings and linings - Part 2: Maintenance and field repair coatings for riser pipes (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents".

Drafting.

This document is Part 2 of GB/T 46429 "External Corrosion Protection of Risers with Coatings and Coatings for Petroleum, Petrochemical and Natural Gas Industries".

GB/T 46429 has published the following parts.

---Part 1: Elastomer-based corrosion protection system. polychloroprene or ethylene propylene diene monomer (EPDM) rubber;

---Part 2: Maintenance and on-site repair of riser anti-corrosion coating.

This document is modified to adopt ISO 18797-2:2021 "Coatings and claddings for external corrosion protection of risers in the petroleum, petrochemical and gas industries".

Part 2: Maintenance and on-site repair of riser corrosion protection layer.

The technical differences between this document and ISO 18797-2:2021, and the reasons therefor, are as follows.

---ISO 80000-1 (see 6.3) has been replaced by the normatively referenced GB/T 3101-1993, and GB/T 533 has been replaced by the normatively referenced GB/T 533.

ISO 2781 (see 12.5.8) has been replaced, and ISO 1183-1 (see Table 5) has been replaced with the normatively referenced GB/T 1033.1.

The normative reference GB/T 1040.1 replaces ISO 527-1 (see Table 6), and the normative reference GB/T 1040.2 replaces [the previous one].

ISO 527-2 (see 10.5.12.6) replaces ISO 527-3 (see Chapter 10) with the normatively referenced GB/T 1040.3.

The normatively referenced GB/T 1408.1 replaces ASTM D149 (see Chapter 11), and the normatively referenced GB/T 1690 replaces...

ISO 1817 (see Chapter 12) was replaced by the normatively referenced GB/T 2411, replacing ISO 868:2003 (see Chapter 12).

The normatively referenced GB/T 2423.19 replaces ASTM D149 (see Chapter 12), and is replaced by the normatively referenced GB/T 2941.

It replaces ISO 23529:2004 (see Chapter 12) and replaces ISO 3801:1977 (see Chapter 12) with the normatively referenced GB/T 4669.

Chapter 11) replaces ISO 4624:2002 with the normatively referenced GB/T 5210 (see Chapter 11), and uses the normatively referenced...

GB/T 6031 replaces ISO 48:2010 (see Chapter 12), and the normatively referenced GB/T 6672 replaces ISO 4593.

In.1993 (see Chapter 10), ISO 2811-1:1997 (see Chapter 11) was replaced by the normatively referenced GB/T 6750.

GB/T 7790, a normative reference, replaces ASTM D1141 (see Chapter 12, Appendix B).

GB/T 8923.1 replaces ISO 8501-1:2007 (see 7.2.2 and Table 3) and replaces the normatively referenced GB/T 8923.4.

ISO 8501-4:2007 (see 7.2.2 and Table 3) has been replaced by the normatively referenced GB/T 13021, replacing ISO 6964:2019.

(See Chapters 10 and 11) ISO 8503-2:1988 (see 7.2.2) has been replaced by the normatively referenced GB/T 13288.2.

ISO 8503-5:2003 (see 7.2.2) has been replaced by the normatively referenced GB/T 13288.5.

GB/T 13452.2 replaces ISO 2808 (see Table 9), and the normatively referenced GB/T 14522 replaces ISO 16474-3.

(See Chapter 12) ISO 4892-2:2013 has been replaced by the normatively referenced GB/T 16422.2 (see Chapters 10 and 11).

Chapter 12 replaces ISO 10474:2013 with the normatively referenced GB/T 16422.3 (see Chapter 12).

GB/T 21775 replaces ISO 1523 (see Chapter 11) to facilitate the use of this document;

---The normative reference GB/T 1689 (see 12.1) has been added to meet domestic requirements;

---The definition of "surface" has been removed (see 3.26 in ISO 18797-2:2021). People in related fields in China are very familiar with the concept of "surface." Known, no definition is needed;

---The terminology and definition of "riseer" have been changed (see 3.19), as the terminology for risers differs between domestic and international contexts;

---The abbreviations NACE and SSPC in the original text have been removed, the abbreviation TDS has been added, and all PDS values in the entire text have been unified.

The previous version was changed to TDS (see 4.2) for easier application of this document;

---Change "temperature probe" to "infrared thermometer" (see 9.2, Table 3) for easier application of this document;

---The unit for Vickers hardness A has been changed to HA (see 12.1, Table 17) for ease of application in this document;

---The requirement of "and thickness not less than 13mm" has been added (12.5.3.2) to conform to common domestic practices;

---Added Akron wear test requirements (see Tables 17 and 18) to facilitate the application of this document.

The following editorial changes have been made to this document.

---The standard name has been changed to "External Corrosion Protection of Risers with Coatings and Coatings for Petroleum, Petrochemical and Gas Industries - Part 2" Part 1: Maintenance and On-site Repair of Riser Corrosion Protection Layer;

---Replace all compounds in the text with polymers;

---Notes have been removed from ISO 18797-2.20213.19 and 7.6.2;

---References to sections in ISO 18797-2:2021 11.5.1.1, 12.5.1, and 13.5.1 have been removed;

---A bar number has been added to each chapter containing multiple paragraphs;

---Use columns to represent all listed, ordered, or differentiated content at different levels throughout the text;

---The note in ISO 18797-2.202110.5 has been removed to avoid unnecessary references to other foreign standards outside of ISO.

Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.

This document was proposed and is under the jurisdiction of the National Technical Committee on Standardization of Petroleum Drilling and Tools (SAC/TC96).

Introduction

Offshore risers with anti-corrosion coatings are intermittently exposed to various conditions, including but not limited to sunlight, rain, snow, hail, water mist, and salt.

Fog, high humidity, fluctuating ambient temperatures (ranging from below zero to high temperatures), the effects of water currents and waves, and marine life. Exposure to these conditions...

This can lead to severe deterioration of the anti-corrosion layer at any time, resulting in poor anti-corrosion performance of the steel riser. This document addresses the production and maintenance stages of risers.

The different requirements for anti-corrosion coatings during the maintenance phase have led to the development of targeted standards for material selection, construction, and performance testing, providing guidance for designers and manufacturers.

To provide a complete and systematic solution for the corrosion protection of marine risers, including the contractor, the construction company, and the user, and to ensure the safe operation of the marine platform.

Sexuality. GB/T 46429 "Coatings and Coatings for External Corrosion Protection of Risers in the Petroleum, Petrochemical and Natural Gas Industries" is proposed to consist of two parts.

---Part 1: Elastomer Corrosion Protection System - Polychloroprene or EPDM rubber. The purpose is to specify the application process for risers.

The anti-corrosion layer is defined based on elastic anti-corrosion layers (chloroprene rubber, EPDM rubber, or those used in the oil and gas industry, etc.).

Minimum technical requirements for the external anti-corrosion layer and lining of risers (effective elastic anti-corrosion layer).

---Part 2: Maintenance and On-site Repair of Riser Corrosion Protection Coating. The purpose is to standardize the maintenance requirements and on-site repair procedures for riser corrosion protection coatings.

The regulations stipulate the selection criteria and minimum requirements for the anti-corrosion layer.

Oil, petrochemical and natural gas industries External corrosion protection for risers is achieved through coating and cladding.

Part 2: Maintenance and On-site Repair of Riser Corrosion Protection Coating

1 Scope

This document specifies the general rules, evaluation process and construction procedures, anti-corrosion coating selection criteria, and testing procedures for riser corrosion protection coating maintenance and on-site repair.

Preface and amorphous low-viscosity polyolefin-based anti-corrosion layer, petrolatum tape and wax-based tape wrapping system, polychloroprene rubber-based elastic coating, liquid ring Requirements for oxygen coatings, etc.

This document applies to the maintenance requirements and on-site repair work for riser coatings.

This document does not apply to the selection of techniques and materials for ensuring the integrity of risers to be coated, nor does it apply to systems other than the anti-corrosion coating described in this document.

Other mechanical protective materials are also an option.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 533 Determination of density of vulcanized rubber or thermoplastic rubber (GB/T 533-2008, ISO 2781:2007, IDT) GB/T 1033.1 Determination of density of non-foamed plastics – Part 1: Impregnation method, liquid pyrometer method and titration method (GB/T 1033.1-2008,ISO 1183-1:2004,IDT) GB/T 1040.1 Determination of tensile properties of plastics – Part 1: General (GB/T 1040.1-2018, ISO 527-1.

2012, IDT)

GB/T 1040.2 Determination of tensile properties of plastics – Part 2: Test conditions for molded and extruded plastics (GB/T 1040.2-2022, ISO 527-2:2012, MOD) GB/T 1040.3 Determination of tensile properties of plastics - Part 3: Test conditions for films and sheets (GB/T 1040.3-2006, ISO 527-3:1995, IDT) GB/T 1408.1 Electrical strength test methods for insulating materials - Part 1: Tests at power frequency GB/T 1689 Determination of abrasion resistance of vulcanized rubber (using Akron abrasion tester) GB/T 1690 Test methods for resistance to liquids of vulcanized or thermoplastic rubber (GB/T 1690-2010, ISO 1817:2005) MOD) GB/T 2411 Plastics and hard rubber - Determination of indentation hardness (Shore hardness) using a hardness tester (GB/T 2411-2008, ISO 868.

2003, IDT)

GB/T 2423.19 Environmental testing – Part 2: Test methods – Test Kc. Sulfur dioxide test for contact points and connections GB/T 2941 General procedures for specimen preparation and conditioning in physical testing of rubber (GB/T 2941-2006, ISO 23529.

2004, IDT)

GB/T 3101-1993 General Principles Concerning Quantities, Units and Symbols GB/T 4669 Textiles - Determination of mass per unit length and mass per unit area of woven fabrics (GB/T 4669-2008) ISO 3801:1977, MOD)