The heart of Article 8 lies in the rigorous requirements for equipment calibration. An uncalibrated machine is useless; it would be like trying to measure a distance with a rubber band.
| Indication Class | Amplitude | Length | Action | |----------------|-----------|--------|--------| | | > 20% DAC | > 1/4 in (6 mm) | Reject | | Nonlinear (porosity) | > 50% DAC | > 1/2 in (12 mm) | Reject | | Root indications | Any amplitude | Any length | Evaluate by geometry | asme section v article 8
| Parameter | Requirement | |-----------|--------------| | Sound Path Accuracy | Within 2% of full scale | | Sensitivity (DAC) | 20% to 80% screen height | | Scanning Sensitivity | 2× reference level (6 dB higher) | | Material Temperature | Record if > 100°F (38°C) | The heart of Article 8 lies in the
Max carefully applied the solution to the welded seams. According to the code, he had to ensure the surface temperature was within the required range—too hot and the liquid would flash off; too cold and it wouldn't flow. He placed the clear-topped vacuum box over the seam and engaged the pump. According to the code, he had to ensure
Even experienced NDE professionals make mistakes with Article 8. Here are the top pitfalls: