In this forum readers will be able to present practical problems for discussion. It is envisaged that these contributions will include not only discussion of general problems and incidents of corrosion but that suggested remedies will also be presented and discussed. It is hoped that this exchange of knowledge and experience will become a permanent feature of this periodical. We are particularly anxious that both Senior Scientists and those with more practical experience will make use of this forum to exchange information, problems and potential remedies.
Cracking investigation of a pressure transmitter tapping line
Article first published online: 16 MAY 2012
© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Materials and Corrosion
Volume 65, Issue 1, pages 82–87, January 2014
How to Cite
Al-Meshari, A., van Zyl, G. N., Diab, M. and Al-Ghadeer, Y. (2014), Cracking investigation of a pressure transmitter tapping line. Materials and Corrosion, 65: 82–87. doi: 10.1002/maco.201206539
- Issue published online: 6 JAN 2014
- Article first published online: 16 MAY 2012
- Manuscript Accepted: 30 MAR 2012
- Manuscript Received: 8 FEB 2012
- austenitic stainless steel;
- ethylene furnace;
- PTA SCC;
This article describes the findings of an investigation on cracking of ethylene furnace pressure transmitter tapping lines made of stainless steel type 304H. A detailed failure analysis using several characterisation techniques such as visual and metallographic examinations, SEM/EDX, XRF/C&S as well as finite element analysis uncovered that the cracking was caused by polythionic acid stress corrosion cracking that took place due to presence of condensate, sulphides and oxygen in contact with sensitised material. Several corrective measures to prevent similar failures are discussed.