Menu
Search
Filters
Close
Menu

Save 20% on select titles with code HIDDEN24 - Shop The Sale Now

07196 Pitting Corrosion Problems of Stainless Steels in a PTA Plant

Picture for 07196 Pitting Corrosion Problems of Stainless Steels in a PTA Plant
Available for download
Product Number: 51300-07196-SG
ISBN: 07196 2007 CP
Author: Oluwatoyin Ashiru and Abdullah Al-Refaie
Publication Date: 2007
$0.00
$20.00
$20.00
Severe pitting corrosion problems occurred in a Purified Terephthalic Acid (PTA) production plant. The materials of construction of the various vessels, columns, and piping that are of concern are 316L and 2205-Duplex stainless steels. The process stream consists of acetic acid solvent, para-xylene, and catalyst (Br-, Co++, and Mn++) at high temperature. In some instances, the corrosion pits developed into perforations through piping wall in units made of 316L-stainless steel which led to shutdowns. Failure analysis was undertaken to investigate the cause of the pitting corrosion in the plant. Dye penetrant NDT method was used to locate the pitted regions of the PTA plant. Compositional analyses of the deposits that were obtained from the inner surface of the vessels and piping systems were carried out using the EDS, XRF and XRD techniques. The objective of the analysis was to identify the elemental constituent of the deposits that were removed from various vulnerable locations of the plant. Scanning electron microscopy revealed the nature and extent of pits and pinhole on samples that were cut off from severely pitted piping sections that were replaced in the plant. The study showed that the pitting corrosion was aggravated by process upsets and the presence of some aggressive contaminants. This paper discusses the failure analysis investigation. It also highlights the remedial measures that were successfully implemented to avert the reoccurrence of the problem in the plant.
Severe pitting corrosion problems occurred in a Purified Terephthalic Acid (PTA) production plant. The materials of construction of the various vessels, columns, and piping that are of concern are 316L and 2205-Duplex stainless steels. The process stream consists of acetic acid solvent, para-xylene, and catalyst (Br-, Co++, and Mn++) at high temperature. In some instances, the corrosion pits developed into perforations through piping wall in units made of 316L-stainless steel which led to shutdowns. Failure analysis was undertaken to investigate the cause of the pitting corrosion in the plant. Dye penetrant NDT method was used to locate the pitted regions of the PTA plant. Compositional analyses of the deposits that were obtained from the inner surface of the vessels and piping systems were carried out using the EDS, XRF and XRD techniques. The objective of the analysis was to identify the elemental constituent of the deposits that were removed from various vulnerable locations of the plant. Scanning electron microscopy revealed the nature and extent of pits and pinhole on samples that were cut off from severely pitted piping sections that were replaced in the plant. The study showed that the pitting corrosion was aggravated by process upsets and the presence of some aggressive contaminants. This paper discusses the failure analysis investigation. It also highlights the remedial measures that were successfully implemented to avert the reoccurrence of the problem in the plant.
Product tags
Also Purchased
Picture for 07189 Extending the Application Range of Super Duplex Stainless Steels
Available for download

07189 Extending the Application Range of Super Duplex Stainless Steels

Product Number: 51300-07189-SG
ISBN: 07189 2007 CP
Author: Kenneth Goransson, Marie-Louise Nyman, and Martin Holmquist
Publication Date: 2007
$20.00
Picture for 07198 Stainless Steel Pitting in Chloride-Sulfate Solutions - The Role of Cations
Available for download

07198 Stainless Steel Pitting in Chloride-Sulfate Solutions - The Role of Cations

Product Number: 51300-07198-SG
ISBN: 07198 2007 CP
Author: P. Pohjanne, L. Carpen, P. Kinnunen, J. Ramo, A. Sarpola, M. Riihimaki, and T. Hakkarainen
Publication Date: 2007
$20.00

 In this study the pitting behavior of stainless steel type AISI 304 (EN 1.4301) has been studied in various binary mixtures of MgSO4, K2SO4 or Li2SO4 with NaCl. Results are compared to those obtained in binary mixtures of Na2SO4 with NaCl as well as in plain NaCl.
Picture for 11255 Pitting Corrosion Mechanisms of Lean Duplex
Available for download

11255 Pitting Corrosion Mechanisms of Lean Duplex, Duplex and Super Duplex Stainless Steels in Chloride Solutions

Product Number: 51300-11255-SG
ISBN: 2011 11255 CP
Author: J. Saithala, J. Atkinson, H Ubhi, A. Patil
Publication Date: 2011
$20.00
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support