How is it carried out to detect linear defects on the surfaces of pipes and pipe fittings using surface penetration testing or magnetic particle testing?
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In GB/T50235-2010, clause 4.3.1 states that for GC1-class pipelines and pipelines carrying Class C fluids, those that transport media with extremely hazardous toxicity or have a design pressure of 10 MPa or higher, magnetic particle testing or penetrant testing shall be carried out on their outer surfaces. The testing methods and defect assessment procedures shall comply with the relevant provisions of the current standard **JB/T4730 on Non-Destructive Testing of Pressure Equipment**. May I ask: does this inspection refer to the entire outer surface of the pipe? Isn’t that amount that large?
It’s the entire surface, and there are also efficient methods for flaw detection, such as the coil method.
Are there any corresponding guidelines or standards?