GB/T 34903.1-2026Petroleum, petrochemical and natural gas industries - Non-metallic materials in contact with media related to oil and gas production - Part 1: Thermoplastics (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 Section 1 of GB/T 34903 "Non-metallic materials in contact with media related to petroleum, petrochemical and natural gas industries and oil and gas extraction".

Parts. GB/T 34903 has published the following parts.

---Part 1: Thermoplastics;

---Part 2: Elastomers;

---Part 4: Fiber-Reinforced Composites.

This document replaces GB/T 34903.1-2017 "Nonmetallic Materials in Contact with Media Related to Petroleum, Petrochemical and Natural Gas Industries and Oil and Gas Extraction".

The changes are as follows.

a) The terms "end user," "seal," "lining," "manufacturer," "materials specification," "operating temperature," and "minimum operating temperature" have been removed.

"degree", "pipeline", "pipeline", "thermoplastic", and "gasket" and their definitions (see 3.1.1, 3.1.3~3.1.7 of the 2017 edition).

(3.1.9~3.1.11, 3.1.14 and 3.1.15)

b) Added "Production Batch", "Certificate of Conformity", "Components", "Mixed Materials", "Processing Technology", "Inspection Batch", "Evaluation Temperature", "Pretreatment", and "Standard Room" the terms and definitions of "temperature," "coefficient of variation," and "threshold time" (see 3.1.1–3.1.5, 3.1.7, 3.1.9–3.1.11, 3.1.15, and 3.1.15) are as follows.

Version 3.1.16 was updated, and the definition of "compatibility" was changed (see 3.1.14, version 3.1.16 in 2017).

c) Performance requirements for materials and their components have been removed (see Chapter 4 in the 2017 edition);

d) Added general requirements for Level 4 testing (see Chapter 4);

e) The "Technical Information Requirements" has been changed to "Physicochemical Performance Testing (L1 Test)" (see Chapter 5, Chapter 5 of the 2017 edition);

f) Manufacturing requirements have been removed (see Chapter 6 of the 2017 edition);

g) The evaluation of thermoplastics has been changed to "short-term testing (L2 test)" (see Chapter 6, Chapter 7 of the 2017 edition), and the relevant provisions have been changed.

The general technical indicators for compliance testing are as follows (see Table 7 in the 2017 edition, 6.6.1), and the section on good field service has been removed.

Military service experience does not require a qualification assessment (see 7.1 in the 2017 edition);

h) An accelerated aging test (L3 test) has been added (see Chapter 7);

i) Added long-term testing (L4 testing) for lifetime prediction (see Chapter 8);

j) The requirements regarding the volume of the test container have been changed (see A.1.1.2, C.2.1 of the 2017 edition), and requirements for changing the test medium have been added (see...).

A.1.2.2 and A.1.2.3);

k) The initial pressure requirement for multiphase fluid mixtures has been changed (see A.1.4.3, C.1.3.2 of the 2017 version);

m) Added requirements for leaching rate testing after aging tests (see A.1.8);

n) The requirements for specimen storage after testing have been changed (see A.1.10, C.3.1.1 in the 2017 version);

o) The standard corrosion inhibitor-containing salt water test medium (see Table C.3 in the 2017 edition) and the information on thermal stability phases before and after the aging test have been removed.

Determination of relevant parameters (see C.3.2.3 and C.3.4.4 in the 2017 edition).

This document is modified to adopt ISO 23936-1:2022 "Contacts between media in the oil and gas industry, including low-carbon energy sources and oil and gas production".

Non-metallic materials, Part 1: Thermoplastics.

This document has undergone the following structural adjustments compared to ISO 23936-1:2022.

---6.1 corresponds to 6.1 and 6.2.1 in ISO 23936-1:2022;

---6.2~6.6 correspond to 6.2.2~6.2.6 in ISO 23936-1:2022, respectively;

---6.7 and 6.8 correspond to 6.3 and 6.4 in ISO 23936-1:2022, respectively;

---8.7.2 and 8.7.3 correspond to paragraphs 1 to 3 of B.1 in ISO 23936-1:2022.

The technical differences between this document and ISO 23936-1:2022, and the reasons therefor, are as follows.

---The term and definition of "maximum rated temperature" (see 3.1.13 of ISO 23936-1:2022) have been removed to accommodate the corresponding tests in Table 1.

Modification of the test items;

---The term and definition of "operating temperature" (see 3.1.15 of ISO 23936-1:2022) have been removed to avoid confusion with Table B.5 "maximum operating temperature".

"Temperature" is confused;

---The following terms have been removed. "End User," "Gasket," "Glass Transition Temperature," "Liner," "Pure Resin," "Pipeline," "Pipe," "Thermoplastic," and "Sealing." the terminology and definition of "sealing" (see ISO 23936-1:2022, 3.1.6, 3.1.8~3.1.10, 3.1.14, 3.1.16, 3.1.17) (3.1.22 and 3.1.23), to comply with the relevant national standards;

3.1.16) This document is made more operable;

---The term "room temperature" has been changed to "standard room temperature" (see 3.1.11, 3.1.19 of ISO 23936-1:2022) to conform to relevant national standards.

Standard regulations;

---The abbreviations "CDF", "HDT", "PA", and "PTFEm" (see section 3.2 of ISO 23936-1:2022) have been removed to comply with relevant national regulations.

National standards stipulate;

---The abbreviation "KCl" (see section 3.2 of ISO 23936-1:2022) has been removed; it is not an abbreviation.

---The abbreviation "ST" has been changed to "VST" (see 3.3) for easier application of this document;

---The explanation of the performance changes of highly stable polymers at higher temperatures is changed to "Note" (see 4.1.8) to comply with relevant national standards.

Regulation;

---The post-processing identification code has been changed (see 4.4.5) to avoid duplication with commonly used plastic product codes;

---The normative references GB/T 2411 have replaced ISO 868, GB/T 3398.2 have replaced ISO 2039-2, and GB/T 9341 have replaced...

ISO 178 and GB/T 19466.2 replaced ISO 11357-2, and GB/T 33061.11 replaced ISO 6721-11.

GB/T 1041 replaces ISO 604, GB/T 1634.1 replaces ISO 75-1, and GB/T 1634.2 replaces ISO 75-2 (see...).

Table 1) enhances operability and facilitates the application of this document;

---The normative references to ASTM D638, ASTM D648, ASTM D695, ASTM D785, and ASTM D790 have been removed.

ASTM D792, ASTM E1640, ASTM D2240, and ASTM D5630 (see Table 1) all have corresponding ISO standards.

Or national standards, to facilitate the application of this document;

---The normative reference ISO 11357-6 (see Table 1) has been added to accommodate the verification of the "oxidation induction time" added in Table 1.

Require;

The testing requirements have been expanded to include oxidation induction time; the ash content of the filled resin has been changed to "ash content" and the maximum ash content has been increased.

The mechanical property test requirements at rated temperature are shown in Table 1, to adapt to my country's technical conditions and facilitate the implementation of this document;

---The time for determining the highest stable temperature in the L2 experiment has been changed from "all experiment times" to "28 days ± 3 days" (see 6.2) to better suit the needs of the experiment.

To adapt to my country's technological conditions and increase operability;

---The L2 test duration is changed from "should be 2d, 7d, 14d, and 28d" to "preferably 2d, 7d, 14d, and 28d, but the longest duration should not be less than..." "At 28 days" (see 6.3) to adapt to my country's technical conditions and increase operability;

---The composition of the L2 test "Fluid 2.4" (see 6.4) has been modified to suit my country's technical conditions;

---ISO 527-1 (see Tables 1, 6.5.2, 6.5.4 and Table A.3) has been replaced with the normatively referenced GB/T 1040.1, adding operability.

For the purpose of this document, it is intended to facilitate its application.

---ASTM D1708 (see Tables 1, 6.5.2, and 6.6.4) has been replaced with the normatively referenced GB/T 39714.2, adding operability.

For the purpose of this document, it is intended to facilitate its application.

---The pretreatment requirements for test specimens in L3 and L4 tests have been removed from the L2 test (see 6.7) to avoid conflicts with the L3 and L4 tests.

Repeating is required (see 7.8 and 8.8) to comply with the relevant national standards.

---The test fluid 3.3 and its composition in L3 have been added (see 7.4) to adapt to my country's technical conditions;

---The requirement for the number of test temperature points for L3 and L4 has been changed from "3 types or no less than 3 types" to "no less than 3 types" (see 7.1.1).

7.1.4, 7.2.1, 8.2.1, 8.9.2, A.1.3, A.3.3, and A.3.4) contribute to the consistency of standards and improve the accuracy of lifetime prediction.

Certainty;

---Increased the requirements for sample size measurement accuracy (see A.1.7) to improve operability.

The following editorial changes have been made to this document.

Nonmetallic Materials Part 1: Thermoplastics;

---The note for the term "certificate of conformity" has been deleted (see 3.1.2);

---ISO 472:2013 has been replaced with GB/T 2035-2024 (referenced for informational purposes). The consistency level between the two documents is non-equivalent.

Effect (see 3.1.4);

---The abbreviation "Af" is corrected to the symbol "Af" (see 3.2);

---The example of specimen identification referencing ASTM D638 has been removed (see 4.4.1 of ISO 23936-1:2022);

---ISO 2578 has been replaced with GB/T 7142 (see 4.4.5 and B.3) for informational purposes;

---Added notes for 6.4 and 7.4;

---The fitted curves and table data have been modified (see Figures B.2, B.4, Tables B.4, B.7, and B.8);

---Change the explanation of HIC to a footnote (see Table B.5).

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 and Natural Gas (SAC/TC355).

Introduction

Non-metallic materials are widely used in various components and equipment in the petroleum, petrochemical, and natural gas industries. The aging and degradation of non-metallic materials can lead to this could lead to equipment failure and damage, posing risks to public health, personnel safety, and the environment. To regulate the use of non-metallic materials in oil and gas extraction-related media...

The selection and performance evaluation of non-metallic materials were carried out, and GB/T 34903 "Petroleum, Petrochemical and Natural Gas Industries and Oil and Gas Extraction Related Media Contact" was formulated.

This is part of the "Metallic Materials" series of documents. GB/T 34903 will cover common categories of non-metallic materials used in the oil and gas industry (such as thermoplastics, elastic materials, etc.).

(Contains thermosetting resins and fiber-reinforced composite materials), which helps prevent major equipment failures caused by the aging and degradation of non-metallic materials.

This will benefit all stakeholders across the entire industry chain, including equipment operators, material and equipment manufacturers, design firms, and industry regulators.

GB/T 34903 specifies the general principles for stability assessment of non-metallic materials used in oil and gas exploration and development equipment.

Rules, technical requirements, and methods. Based on the types of non-metallic materials used in the oil and gas industry, such as thermoplastics, elastomers, and thermosetting resins.

Resin and fiber reinforced composite materials, GB/T 34903, are proposed to consist of four parts.

---Part 1: Thermoplastics. The purpose is to specify the relevance of thermoplastics in oil and gas production equipment.

General principles, technical requirements, and methods for energy stability assessment.

---Part 2: Elastomers. The purpose is to specify the selection and evaluation of elastomer materials used in oil and gas production equipment.

The general principles, basic requirements, and evaluation methods of pricing.

---Part 3: Thermosetting Resins. The aim is to specify thermosetting resin materials used in oil and gas production equipment.

The general principles, basic requirements and evaluation methods for the selection and evaluation of [the relevant technologies].

---Part 4: Fiber-Reinforced Composites. The aim is to specify fiber-reinforced composite materials used in oil and gas production equipment.

General principles, basic requirements, and evaluation methods for the selection and evaluation of composite materials.

Non-metallic materials in contact with mining-related media Part 1: Thermoplastics Warning. The thermoplastics selected in this document are capable of withstanding certain environments in the oil and gas industry, but not all operating conditions.

All materials possess full resistance under these conditions. This document requires the equipment user to be fully responsible for verifying whether the material is suitable for the intended operating conditions.

1 Scope

This document specifies the general principles, technical requirements, and methods for evaluating the service stability of thermoplastics used in equipment for oil and gas exploration and production environments.

This document also provides guidance on quality assurance. This document supplements, but does not replace, equipment design guidelines, standards, or legal regulations.

Existing material technology requirements.

This document addresses the assessment of the physical or chemical interactions of thermoplastics with oil and gas field produced and injected media and chemical treatment agents.

The ability to resist performance degradation over time. This document does not cover material aging caused by sunlight exposure and particle radiation, or aging caused by rapid gas decompression.

Evaluation of the bubbling effect.

This document applies to, but is not limited to, the following equipment. non-metallic pipelines, pipes, linings, seals, gaskets, and sealing rings. This document does not apply to...

It is not suitable for downstream processing equipment and facilities in the oil refining, chemical, or oil and gas industries, nor for coatings.

This document is applicable to evaluating the stability of thermoplastics under simulated oil and gas production conditions, and is intended to provide a basis for designing and manufacturing thermoplastics using conventional design specifications.

This document provides a basis for material selection for the manufactured equipment. This document does not apply to material selection using other design specifications.

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.

2019, MOD)

GB/T 1041 Determination of compressive properties of plastics (GB/T 1041-2008, ISO 604:2002, IDT) GB/T 1634.1 Determination of temperature of deformation under load in plastics – Part 1: General test methods (GB/T 1634.1-2025) ISO 75-1:2020, MOD) GB/T 1634.2 Determination of temperature of deformation under load for plastics – Part 2: Plastics and hard rubber (GB/T 1634.2-2019) ISO 75-2:2013, 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 3398.2 Plastics – Determination of hardness – Part 2: Rockwell hardness (GB/T 3398.2-2008, ISO 2039-2.

1987, IDT)

GB/T 9341 Determination of flexural properties of plastics (GB/T 9341-2008, ISO 178:2001, IDT) GB/T 19466.2 Differential Scanning Calorimetry (DSC) for Plastics – Part 2: Determination of Glass Transition Temperature (GB/T 19466.2-2025,ISO 11357-2:2020,IDT) GB/T 33061.11 Determination of dynamic mechanical properties of plastics – Part 11: Glass transition temperature (GB/T 33061.11-