Authors: Smillie, M.J.; Olatte, O.; Thomas, C.; Levi, T.

Source: Materials at High Temperatures, Volume 24, Number 3, September 2007 , pp. 241-248(8)

Publisher: Science Reviews 2000 Ltd

Abstract:

Methanol outlet reformer tubes, or pigtails, transport reformed syngas from reformer tubes to outlet manifolds at high temperature (800-900°C). These outlet tubes tend to have a convoluted geometry to accommodate thermal expansion of the reformer tubes, outlet tubes and manifolds, hence the term pigtails. The industry standard material for reformer outlet tubes is Alloy 800HT, a creep resistant austenitic Ni-Cr steel. A number of anomalous in-service failures of Alloy 800HT reformer outlet tubes have occurred at lower than expected service life and at low creep deformation. A discussion of the failures is presented in this paper, covering the parameters which affect potential damage mechanisms.

Keywords: steam reformer outlet; alloy 800H/HT; creep failure; material degradation

Document Type: Research article

DOI: http://dx.doi.org/10.3184/096034007X267763

Affiliations: 1: MPT Solutions, Industrial Research Ltd, Lower Hutt 6009, New Zealand

Publication date: 2007-09-15

More about this publication?

• Materials at High Temperatures serves the needs of those who develop and use materials for high temperature applications. It publishes peer reviewed contributions relating to high temperature applications in the power, chemical, engine, processing and furnace industries.

  The effects of high temperatures on corrosion, fatigue, creep, strength and wear in alloys, intermetallics, ceramics, refractories and composites are covered. Papers dealing with aspects of materials usage including modelling of behaviour and life prediction will be particularly welcome. The journal has a policy of emphasizing practical aspects and authors presenting results from research programmes are encouraged to relate these, if possible, to actual or potential applications.

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