Celebrate World Corrosion Awareness Day with 20% off eCourses and eBooks with code WCAD2024 at checkout!
Refining industry cooling systems are prone to many different corrosion deterioration mechanisms one of which is microbiologically influenced corrosion (MIC). The study resulted in the development of a comprehensive control and monitoring plan to safeguard the integrity of the system.
Refining industry cooling systems are prone to many different corrosion deterioration mechanisms one of which is microbiologically influenced corrosion (MIC). Bacteria are ubiquitous; they have been implicated in a number of major failures and their control measures have a high economic impact on the refining industry. This work investigates the unexpected failures and leaks observed in several seawater heat exchanger tubes which resulted in plant shutdowns and significant production losses. Both metallurgical and molecular microbiological methods were deployed to comprehend the root cause of these failures. Metallurgical analysis in all examined tubes (70-30 Cu-Ni and Al-brass) revealed localized pitting with circular and cup-like morphology typical of those formed by MIC attack. The subsequent DNA analysis revealed the coexistence of various strains of acid producing bacteria (APB) and iron oxidizing bacteria (IOB) in the collected corrosion products with a noticeable absence of sulfate reducing bacteria (SRB). Lack of adequate chlorination and presence of hydrocarbons and other organic matters that naturally end up in the open transport channel as a nutritional source led to flourishing microbial population including corrosion-causing species and subsequent rapid MIC attacks. Cost effective short- and long-term action plans including criticality assessment timed replacements selective cleaning chlorination dosage adjustments and carbon source identification monitoring were considered. The study resulted in the development of a comprehensive control and monitoring plan to safeguard the integrity of the system.
Key words: downloadable, Refinery, MIC, bacteria, cooling system, IOB, APB, heat exchanger
The alloys (used in chem/process industries) are usually in the solution annealed condition & must be fast cooled from the annealing temperature to prevent the precipitation of third phases such as sigma chi nitrides & alpha prime. This paper describes a reactivation test to detect alpha prime - used with 22%Cr and 25% Cr alloys. Case studies.
We are unable to complete this action. Please try again at a later time.
If this error continues to occur, please contact AMPP Customer Support for assistance.
Use this error code for reference:
Please login to use Standards Credits*
* AMPP Members receive Standards Credits in order to redeem eligible Standards and Reports in the Store
You are not a Member.
AMPP Members enjoy many benefits, including Standards Credits which can be used to redeem eligible Standards and Reports in the Store.
You can visit the Membership Page to learn about the benefits of membership.
You have previously purchased this item.
Go to Downloadable Products in your AMPP Store profile to find this item.
You do not have sufficient Standards Credits to claim this item.
Click on 'ADD TO CART' to purchase this item.
Your Standards Credit(s)
1
Remaining Credits
0
Please review your transaction.
Click on 'REDEEM' to use your Standards Credits to claim this item.
You have successfully redeemed:
Go to Downloadable Products in your AMPP Store Profile to find and download this item.
Based on alloy development and manufacturer independent supply experience of super duplex steel over a 30 year period the paper considers some of the less well known but recurring problems and the methods used to ameliorate them.
The paper reviews the history of Hydrogen Induced Stress Cracking (HISC) failures of duplex and super duplex stainless steels when deployed subsea and subject to CP at potentials around minus 1V.