GB/T 43922-2024 in English

1. Phased array ultrasonic testing technology

The standard innovatively introduces phased array ultrasonic testing methods, which improves the defect recognition sensitivity of thermal melt joints and electrical melt joints by 40% compared with traditional X-ray testing. The main detection features include:

• Fusion surface inclusions (detection size ≥1mm)
• Void defects (detection rate ≥95%)
• Cold welding/over welding phenomenon

2. Remaining life prediction model

The aging prediction algorithm is established based on the Arrhenius equation, and the prediction error is controlled within ±15% through dual parameter verification of oxidation induction time and elongation at break. Key formula:

lnK = lnB - E/RT

The E value was determined to be 205.95kJ/mol (PE80 material) through experiments

Note: For the quality grading of welded joints, refer to the results of digital radiographic testing in Appendix D

Capacity building of inspection institutions

1. It is necessary to obtain DD2 public pipeline inspection qualification
2. RBI inspection must be equipped with phased array inspection personnel of Level II and above
3. Establish a pipeline GIS database system

Management requirements for user units

• Improve the original data of pipelines (see Table 1 Design and manufacturing data)
• Implement integrity management (Appendix G Life prediction)
• Annual inspection key areas (Appendix A Article A.2)