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Ammonium nitrate induced cracking of a dryer

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journal contribution
posted on 06.12.2017, 00:00 by Richard Clegg, R Tomlins, M Mackay
After less than 1 year of service, extensive cracking of two ammonium nitrate prill dryers was found. The cracking was found to be ammonium nitrate-induced stress corrosion cracking and the failure was attributed to a lack of post-weld stress relieving of the fabricated structures. It was considered likely that the SCC would occur more slowly once the cracks had progressed beyond the region of high residual stresses and that the design operating stresses in the dryer would be insufficient to cause rapid cracking in the dryers. In order to manage the dryers until new ones could be fabricated, the dryers were operated normally with regular inspections to monitor crack growth and to date, no significant addition crack growth of major cracks was observed.

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Volume

18

Issue

6

Start Page

1559

End Page

1564

Number of Pages

6

eISSN

1350-6307

ISSN

1350-6307

Location

Oxford

Publisher

Elsevier

Language

en-aus

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

Institute for Resource Industries and Sustainability (IRIS); Orica Mining and Resources; Process Engineering and Light Metals; Rexsan Pty Ltd;

Era Eligible

Yes

Journal

Engineering failure analysis.