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GB/T 33488.4-2017Test method of pressure equipments of thermoplastics welded for chemicals—Part 4:Ultrasonic examination (English PDF)

化工用塑料焊接制承压设备检验方法第4部分：超声检测

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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 33488.4-2017 is the English-translated version of 化工用塑料焊接制承压设备检验方法第4部分：超声检测.

GB/T 33488.4-2017 is Part 4 of the Chinese test methods for welded thermoplastic pressure equipment used in the chemical industry, and it covers ultrasonic examination by the type A pulse-echo technique.

It fixes the general requirements on personnel, on the examining body, on environmental conditions and on equipment; the setting of parameters with the reference blocks, the scanning sensitivity, the transfer correction, the signal-to-noise ratio and the probe and sound velocity; the examination procedure; the recording, sizing, assessment and quality grading of discontinuities; and the content of the test report.

It applies to welded joints in pipe or sheet of polyethylene, polypropylene, PVC, ABS, PVDF and modified PTFE made by hot gas, extrusion, hot-melt and other welding processes in pressure vessels and pressure piping. Issued on 28 February 2017, it has applied since 1 September 2017.

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Document preview — GB/T 33488.4-2017

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 parameter setting
5.1 General
5.2 Test block
5.3 Scan sensitivity
5.4 Transmission Amendment
5.5 Signal to noise ratio
5.6 probe and sound speed
6 detection process
6.1 Preparation before testing
6.2 Surface cleaning of welded joints
6.3 Detection area determination
6.4 Detection technology selection
7 Classification and evaluation of weld quality
7.1 defect record
7.2 Defect Quantification
7.3 Defect assessment
7.4 Quality rating
8 Test Report
Appendix A (informative) Ultrasonic testing report format
Reference

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 4 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 ultrasonic testing method for chemical welding equipment for chemical industry, parameter setting, inspection Test procedures and test reports.

This part is suitable for the use of polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), acrylonitrile - butadiene - styrene plastic (ABS) Polyvinylidene fluoride (PVDF) and modified polytetrafluoroethylene (PTFE) and other thermoplastic pipe or sheet, and the use of hot air welding, extrusion welding, hot melt Welding and soldering process welding of pressure vessels and pressure piping welded joints by type A pulse reflection method for ultrasonic testing.

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 27664.1 Non-destructive testing - Performance and testing of ultrasonic testing equipment - Part 1: Instrument

GB/T 27664.2 Non-destructive testing - Performance and testing of ultrasonic testing equipment - Part 2: Probes

GB/T 27664.3 Non-destructive testing - Performance and testing of ultrasonic testing equipment - Part 3: Combined equipment

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

3 Terms and definitions

The following terms and definitions apply to this document.

3.1 Focus probe

The use of lens, reflective and curved lenses and other focusing methods, so that the ultrasonic beam convergence to improve the detection sensitivity of the ultrasonic probe.

3.2 Vertical incidence

Incident wave wave front normal perpendicular to the media interface when the incident, also known as normal incidence.

4 General requirements

4.1 Personnel

Ultrasonic testing personnel should be in accordance with the requirements of GB/T 33488.1 to obtain the appropriate qualification level certificate, but also understand the basis of thermoplastic The knowledge, familiar with the plastic welding joint process, familiar with the acoustic properties of thermoplastic materials and the type of joint to be welded, to master the plastic welded joints Ultrasonic testing methods.

4.2 Institutions

The ultrasonic testing mechanism shall comply with the provisions of GB/T 33488.1.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

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