A survey of flaws near welds detected by side angle ultrasound examination of anhydrous ammonia nurse tanks |
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Institution: | 1. National Institute of Aerospace Technology (INTA), Torrejón de Ardoz, Spain;2. Institute of Ceramics and Glass (ICV- CSIC), Kelsen 5, 28049 Madrid, Spain;3. National Centre for Metallurgical Research (CENIM-CSIC), Av. Gregorio del Amo 8, 28040 Madrid, Spain |
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Abstract: | A sample of 532 anhydrous ammonia nurse tanks with manufacture dates ranging from the 1950’s to 2011 were examined during 2012 by side angle ultrasound to measure the locations, sizes, and orientations of flaw indications. The indications were most frequently located on the head side of the head-to-shell welds and oriented perpendicular to the weld line in the welds’ heat affected zones. On average newer tanks had more indications than older tanks. Tanks that had been given a post-weld stress relief anneal had markedly fewer indications. |
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Keywords: | Non-destructive inspection Welds Surface cracks Stress corrosion cracking Residual stress Stress relief Anhydrous ammonia Safety |
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