NDLI: Application of metal magnetic memory test in failure analysis and safety evaluation of vessels

Content Provider	Springer Nature Link
Author	Zhang, Yiliang Yang, Song Xu, Xuedong
Copyright Year	2009
Abstract	Metal magnetic memory test (MMMT), which is a new subject in the field of nondestructive examination, can determine regions of stress concentration by testing the distribution of the magnetic field of metal structures so as to effectively diagnose premature defects. MMMT and other test methods are applied in the study to put a propylene purifier of a temperature-jump accident and a leaked ammonia vessel through safety evaluation. Results are as follows: The margin of safety declines after the purifier is overburnt; several stress concentrations are observed within the overburnt area and the level of stress concentration rises after one-month operation; and overpressure operation of the purifier must be strictly avoided and carefully monitored during later operation. Cracks are observed on the ammonia vessel after one year’s service. Extremely high residual stress is the primary cause of cracks. After four years in service, the residual stresses existing in the area of the base metal and weld zone are still greater than 0.5 σ $_{S}$, which results in numerous cracks due to stress corrosion. From the MMMT result of the ammonia vessel’s defects, it can be seen that the derivative of magnetic density (dH $_{p}$ /dx) is an important reference variable. Within the 31 leakage points, the one whose values of dH $_{p}$ /dx are above 10 occupy 67.7%, and the ones above 8 share 96.8%.
Starting Page	40
Ending Page	48
Page Count	9
File Format	PDF
ISSN	16733479
Journal	Frontiers of Mechanical Engineering
Volume Number	4
Issue Number	1
e-ISSN	16733592
Language	English
Publisher	SP Higher Education Press
Publisher Date	2009-01-07
Publisher Institution	Chinese Universities
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	metal magnetic memory test (MMMT) nondestructive testing (NDT) residual stress propylene purifier ammonia vessel Mechanical Engineering
Content Type	Text
Resource Type	Article
Subject	Mechanical Engineering

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