Failure of pyrolysis coils coated with anit-coking film in an ethylene cracking plant

Goswami, A and Kumar, S (2014) Failure of pyrolysis coils coated with anit-coking film in an ethylene cracking plant. In: ENGINEERING FAILURE ANALYSIS, 39 . pp. 181-187.

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Abstract

This paper presents a specific kind of failure in ethylene cracking coils coated with anticoking film. It investigates a case in which the coils made of 35Cr 45Ni high temperature alloy failed within two years of operation. The damage occurred due to heavy oxidation in localized regions of the coil resulting in the formation of blisters, which eventually failed by cracking. The mechanism involved was determined by studying the oxidized samples under a scanning electron microscope with an energy dispersive system and is attributed to the presence of rare earth metals in the anti-coking film and inherent casting defects in the base alloy. The cerium present in the anti-coking film diffused preferentially to a defect site in the parent alloy thereby resulting in its segregation which further led to embrittlement. (C) 2014 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	ENGINEERING FAILURE ANALYSIS
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Additional Information:	Copyright for this article belongs to the PERGAMON-ELSEVIER SCIENCE LTD, ENGLAND
Keywords:	Anti-coking film; Rare earth elements; Oxidation
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	28 May 2014 09:34
Last Modified:	28 May 2014 09:34
URI:	http://eprints.iisc.ac.in/id/eprint/49077

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