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GB/T 33488.3-2017Test method of pressure equipments of thermoplastics welded for chemicals—Part 3: Radiographic examination (English PDF)

化工用塑料焊接制承压设备检验方法第3部分：射线检测

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

February 28, 2017

Implementation date

September 1, 2017

Scope

GB/T 33488.3-2017 is the English-translated version of 化工用塑料焊接制承压设备检验方法第3部分：射线检测.

GB/T 33488.3-2017 is Part 3 of GB/T 33488 and sets out how welded joints in thermoplastic pressure equipment for the chemical industry are examined radiographically.

It applies to pipe and sheet of polyethylene, polypropylene, PVC, ABS and modified PTFE joined by hot gas welding, extrusion welding, hot plate welding or heat fusion welding, in pressure vessels and pressure piping.

It gives the general requirements on personnel, organisation, environmental conditions and equipment, the technique classification, the preparation of the examination - exposure arrangement, surface treatment, marking, film overlap and image quality indicators - and the exposure itself, from tube voltage and film system to beam adjustment, number of exposures, film processing and viewing.

It also fixes the quality classification of welds and the contents of the test report. Issued on 28 February 2017, it has applied since 1 September 2017.

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Document preview — GB/T 33488.3-2017

National Standard of the People's Republic of China

ICS: 71.120; 59.100
Classification: G 94

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Preface
1 Scope
2 normative reference document
3 Terms and definitions
4 General requirements
4.1 Personnel
4.2 Agency
4.3 Environmental conditions
4.4 Equipment and equipment
5 technical classification
6 Preparation for testing
6.1 Detection arrangement
6.2 Surface treatment
6.3 Marking
6.4 film lap
6.5 Image quality (IQI)
7 Adoption
7.1 Transparent arrangement
7.2 Tube voltage selection
7.3 Film system selection
7.4 Radiation beam adjustment
7.5 Measurement of the distance from the radiation source to the inspected position
7.6 Number of passes
7.7 film processing
7.8 Review requirements
7.9 film requirements
7.10 Image quality (IQI) sensitivity of the film
8 Quality Classification and Evaluation of Welds
8.1 defect type
8.2 Classification of quality levels
8.3 General rules for quality grading
8.4 Classification of circular defects
8.5 Classification of Strike Defects
8.6 Comprehensive rating of defects
9 Test Report
Appendix A (informative) Image quality (IQI) sensitivity
Appendix B (informative) DN >=100mm Method for determining the number of passages of butt welds
Appendix C (informative) Radiation detection report format

Foreword

GB/T 33488 "Chemical plastic welding system with pressure equipment inspection method" is divided into four parts.

- Part 1: General;

Part 2: Appearance inspection;

Part 3: Ray detection;

- Part 4: Ultrasonic testing.

This part is part 3 of GB/T 33488.

This part is drafted in accordance with the rules given in GB/T 1.1-2009.

1 Scope

This part of GB/T 33488 specifies the general requirements for the method of radiographic testing of plastic welding equipment for chemical industry, technical classification, inspection Preparation, adoption and inspection report.

This part is suitable for use with polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), acrylonitrile-butadiene-styrene plastic (ABS) and Modified PTFE (PTFE) and other thermoplastic pipe or sheet, and the use of hot air welding, extrusion welding, welding and hot melt welding process welding Of the pressure vessel and the pressure pipe welding joints of the radiation detection.

2 Normative reference documents

The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this document. For undated references, the latest edition (including all modifications) applies to this document.

GB/T 19348.1 Non-destructive testing - Industrial radiographic film - Part 1: Classification of industrial radiographic film systems

GB/T 19348.2 Non-destructive testing of industrial radiographic films Part 2: Control of film processing using a reference method

GB/T 19802 Non - destructive testing - Minimum requirements for industrial radiography

GB/T 23901.1 Non-destructive testing - Photographic film backgrounds - Part 1: Determination of the image quality index of linear image quality

GB/T 23901.2 Non-destructive testing - Photographic film backgrounds - Part 2: Determination of image quality index

GB/T 26837 Non - destructive testing instruments Fixed and mobile industrial X - ray inspection machines

GB/T 33488.1 Test methods for pressure welding equipment for plastics used in chemical industry - Part 1: General

GBZ 117 Standard for Radiation Protection for Industrial X - Ray Inspection

JB/T 6220 Non - destructive testing instrument - Density tester for radiographic testing

3 Terms and definitions

The following terms and definitions apply to this document.

3.1 Nominal thickness

The nominal thickness of the weld metal base of the weld, which does not require manufacturing tolerances.

3.2 Penetrated thickness

Radiation beam through the material through the nominal thickness, multi-layer irradiation for the beam through the layers of materials, the sum of the nominal thickness.

3.3 Weld surface to film distance

The distance between the radiating side surface of the subject and the film is measured along the centerline of the beam.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 20 pages — is available in the English PDF.

Referenced standards

Normative references

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