GB/T 33488.3-2017 in English
VALIDTest method of pressure equipments of thermoplastics welded for chemicals -- Part 3: Radiographic examination
- Issued on:2017-02-28
- Implemented on:2017-09-01
- File Format:PDF
- Delivery:Via email within 5 business days
$379.00
《GB/T 33488.3-2017化工用塑料焊接制承压设备检验方法 第3部分：射线检测》由TC162（全国非金属化工设备标准化技术委员会）归口，主管部门为中国石油和化学工业联合会。
Introduction
GB/T 33488.3—2017 Standard Overview
GB/T 33488.3—2017 "Inspection methods for welded plastic pressure equipment for chemical industry Part 3: Radiographic inspection" is an important standard in China's chemical industry. It mainly regulates the radiographic inspection method for welds of pressure vessels and pressure pipes made of thermoplastic plastics such as polyethylene (PE), polypropylene (PP) and polyvinyl chloride (PVC).
Comparison table of standard frameworks
| Standard dimensions | GB/T 33488.3—2017 | International comparison |
|---|---|---|
| Detection range | Applicable to radiographic detection of plastic welded joints such as polyethylene and polypropylene | Basically consistent with international standards such as ISO 17638 |
| Technical grading | Grade A and Grade B, with Grade B as the optimized technology | In line with international general grading standards |
| Defect assessment | Five types of defects, including cracks, lack of fusion and lack of penetration, are divided into levels I to IV | Consistent with ASTM F1453-98 |
Implementation Recommendations Chapter
Testing Equipment Selection and Configuration
- X-ray Flaw Detector: It is recommended to use a tube voltage of ≤30kV, which meets the requirements of GB/T 26837
- Image Quality Indicator: It is preferred to use a stepped hole type IQI with a density similar to that of the material being inspected
- Film System: It is recommended to use T1 or T2 film to ensure that the sensitivity meets the requirements of GB/T 19348.1
Detection process optimization
In practical applications, it is recommended to give priority to the double-wall transillumination technology (as shown in Figures 4 and 5), especially in the detection of butt welds of pipes with DN ≥ 100 mm. By reasonably adjusting the X-ray source distance f value and focal length F, the detection sensitivity can be significantly improved.
Quality control measures
- Regularly calibrate equipment parameters to ensure that key indicators such as tube voltage and film blackness meet standard requirements
- Strengthen the training of film reviewers. It is recommended that each film be independently reviewed by at least two senior reviewers and then cross-validated
- Establish a test data traceability system to facilitate subsequent quality analysis and problem tracing
Summary and Outlook
GB/T 33488.3—2017 standard provides comprehensive technical guidance for the radiographic inspection of plastic welding pressure-bearing equipment for chemical industry. Its core contents include: personnel qualification requirements, equipment selection specifications, defect classification and inspection report format. In the future, with the development of plastic welding technology, it is recommended to further optimize the application of automatic inspection system to improve inspection efficiency and accuracy.
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