Inspection and repair of torch tube
Thread Content
100% penetrant testing (PT) is carried out on the longitudinal and circumferential welds of the torch tube. The defect grading for penetrant testing is determined in accordance with the provisions on surface inspection in the **current standard \"Non-destructive Testing of Pressure Equipment\" NB/T 47013-2015; the cumulative length of detected defects is considered acceptable at grade I. 20% X-ray testing (RT) is carried out on the longitudinal and circumferential welds of the torch tube; the locations for testing are determined by the project’s dedicated quality inspector or supervising engineer, with the inspection results required to meet Grade II standards as specified in NB/T 47013-2015. The circumferential welds of the torch cylinder tubes that are joined in the air are inspected by 100% ultrasonic testing (UT), and must meet the grade I requirements specified in standard NB/T 47013-2015. How many grades are there generally for weld quality here, and what are the requirements for each grade? What testing methods are used for Grade I, Grade II, and Grade III respectively?
Is the poster a non-destructive testing specialist? Take standard NB/T 47013-2015 as an example; it explains everything clearly.
Obviously not a non-destructive testing personnel. NB/T 47013-2015 provides a classified explanation, with each testing method having its own description. What I want to know is which testing method is generally used for categories I, II, and III
Non-destructive testing methods generally include RT, UT, PT, MT, etc., and each of these testing methods is further divided into grades I, II, and III. The original poster had better check the standards; it’s impossible to explain it in just one or two sentences
Weld quality is divided into three grades. The third-level quality inspection only checks for visual defects and geometric dimensions in all welds; the visible visual defects and geometric dimension deviations must meet the requirements of the third-level acceptance standards ； In addition to checking the appearance and ensuring compliance with the second-level quality standards, the secondary quality inspection also requires ultrasonic or radiographic testing of 20% of the welds, to meet the requirements of Grade B Inspection Level III ； In addition to visual inspection and meeting the first-level acceptance criteria, first-level quality inspection also requires 100% flaw detection of the welds using ultrasound or radiography, to meet the requirements of Grade B Inspection Level II. Is this correct?