Menu
Search
Filters
Close
Menu

Celebrate World Corrosion Awareness Day with 20% off eCourses and eBooks with code WCAD2024 at checkout!

51317--9518-Chloride Stress Cracking of an Austenitic Stainless Steel Pipe Fitting in a Hydroprocessing Unit

Picture for Chloride Stress Cracking of an Austenitic Stainless Steel Pipe Fitting in a Hydroprocessing Unit
Available for download

Case study: Cracking occurred in a (UNS S32100) type austenitic stainless steel nozzle fitting at a low point in the reactor effluent piping in a Gasoil Hydrotreater unit following start up. Normal preventive measures had been taken.  The failed sample was removed for metallurgical analysis and determination of mechanism(s).

Product Number: 51317--9518-SG
ISBN: 9518 2017 CP
Author: Hayrik Allahverdian
Publication Date: 2017
Industry: Petroleum Refining
$0.00
$20.00
$20.00

A cracking occurred in a stainless steel branch nozzle fitting at a low point in the reactor effluent piping in a Gasoil Hydrotreater unit following start up.Normal preventive measures were implemented to protect the piping system against Polythionic stress corrosion cracking (PTASCC) during shut down (neutralization & nitrogen purging) however cracking occurred in the 321 type austenitic stainless steel weldolet right after the start up. Materials selection of low point drain including the fitting is in accordance with good engineering practice. Failures of such fittings in similar applications are unusual and are not found in literature.The failed sample was removed for metallurgical analysis and determination of the damage mechanism(s). This paper provides the case history and the investigation in to the root cause.

Key words: Chloride, Polythionic Acid, Caustic, Stress Corrosion Cracking, Hydroprocessing Unit, Hydrotreater, Austenitic Stainless Steel, Failure Analysis.

 

A cracking occurred in a stainless steel branch nozzle fitting at a low point in the reactor effluent piping in a Gasoil Hydrotreater unit following start up.Normal preventive measures were implemented to protect the piping system against Polythionic stress corrosion cracking (PTASCC) during shut down (neutralization & nitrogen purging) however cracking occurred in the 321 type austenitic stainless steel weldolet right after the start up. Materials selection of low point drain including the fitting is in accordance with good engineering practice. Failures of such fittings in similar applications are unusual and are not found in literature.The failed sample was removed for metallurgical analysis and determination of the damage mechanism(s). This paper provides the case history and the investigation in to the root cause.

Key words: Chloride, Polythionic Acid, Caustic, Stress Corrosion Cracking, Hydroprocessing Unit, Hydrotreater, Austenitic Stainless Steel, Failure Analysis.

 

Product tags
Also Purchased
Picture for 97501 CHLORIDE STRESS CORROSION CRACKING OF
Available for download

97501 CHLORIDE STRESS CORROSION CRACKING OF AUSTENITIC STAINLESS STEELS IN HYDROPROCESSING UNITS

Product Number: 51300-97501-SG
ISBN: 97501 1997 CP
Author: A. J. Bagdasarian, D. J. Truax
$20.00
Picture for Assessing Stress Corrosion Cracking Risks on Stainless Steel Piping and Equipment
Available for download

Assessing Stress Corrosion Cracking Risks on Stainless Steel Piping and Equipment

Product Number: 51317--8899-SG
ISBN: 8899 2017 CP
Author: Tina Tajalli
Publication Date: 2017
$20.00

This paper focuses on the risks of polythionic acid and chloride stress corrosion cracking, and reviews the risks from both internal process services and from external atmospheric and/or wet insulation conditions.
Picture for 09348 Prevention of External Chloride Stress Corrosion Cracking of Austenitic Stainless Steel with a
Available for download

09348 Prevention of External Chloride Stress Corrosion Cracking of Austenitic Stainless Steel with a

Product Number: 51300-09348-SG
ISBN: 09348 2009 CP
Author: Johan F.M. Van Roij and Jan G. De Jong
Publication Date: 2009
$20.00

Electrochemical and slow strain rate tests were done to demonstrate the protective ability of a thermal sprayed aluminum coating to prevent chloride stress corrosion cracking of TP304L SS in aqueous chloride solutions. Mitigation methods.
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