(26c) Tube-to-Tubesheet Weld Inspection Secondary Transfer Line Exchangers (STLEs) – Innovative Paut Inspection Technique
AIChE Spring Meeting and Global Congress on Process Safety
2023
2023 Spring Meeting and 19th Global Congress on Process Safety
Topical 4: The 35th Ethylene Producers Conference
Ethylene Plant Maintenance & Reliability
Monday, March 13, 2023 - 3:25pm to 3:50pm
Due to the uniqueness of the tube-to-tubesheet weld design, standard inspection techniques, such as visual inspection (VT) of the root of the tube-to-tubesheet weld may only be performed up to 80% of the welds and a 100% liquid penetrant (PT) on the completed welds does not assess the critical root zone, only the external weld surface and tubesheet area. As a result, a Phased Array Ultrasonic Testing (PAUT) technique was developed to provide a near full volumetric inspection of the weld, with emphasis on high resolution coverage of the critical root zone.
This paper discusses development, testing, proof-of-concept, and implementation of this PAUT technique to ensure the integrity of the welds during fabrication of the STLEâs and the field repairs, when required, so that the equipment could be returned back to service with assurance of safe, reliable operations.
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