Menu
Search
Filters
Close
Menu

Use GIVING24 at checkout to save 20% on eCourses and books (some exclusions apply)!

Determining the Dissolved Oxygen (DO) Concentration Limit for Safe Operation of CRAs in Saline Solution

Picture for Determining the Dissolved Oxygen (DO) Concentration Limit for Safe Operation of CRAs in Saline Solut
Available for download

Study to assess pitting corrosion resistance of 316L ASS (UNS S31603) and 25%Cr SDSS (UNS S32750) in salt solutions containing dissolved oxygen(DO). The DO levels examined were: 20, 50, and 100ppb, and the concentration of chloride ions were up to 152g/L Cl-, at 50 and 60°C. The results are reported herein.

Product Number: 51317--9062-SG
ISBN: 9062 2017 CP
Author: Qing Lu
Publication Date: 2017
Industry: Materials Selection and Design
$0.00
$20.00
$20.00

It is well established that the corrosion rate of carbon/low alloy steels in aqueous solutions (e.g. seawater) is affected by the concentration of dissolved oxygen (DO) along with other environmental factors including temperature chloride ion concentration pH etc. Several models have been developed and used to predict the corrosion rate of carbon steels at different DO levels. However carbon/low alloy steels cannot offer sufficient corrosion resistance in saline solutions at high temperatures (e.g. produced water systems in the oil field) leading to excessive metal loss due to the high corrosion rates. In such cases corrosion resistant alloys (CRAs) may offer a more cost effective/long-term solution. However there have been cases that CRAs were used with the premise that they were immune to corrosion whereas CRAs suffer from localised corrosion in oxygen-containing saline solutions.Depending on the grade of CRAs employed the tolerance level of the DO may vary e.g. a lower level for lower grades of stainless steels (e.g. 316/316L austenitic stainless steel (ASS) and a slightly higher level for higher grades (e.g. 25%Cr superduplex stainless steel (SDSS). However there is a lack of defined DO limits on CRA applications where the materials are considered to be ‘safe’ (free of corrosion) in the operation system.In order to establish the DO limits pitting and crevice corrosion tests were carried out for 316L austenitic stainless steel and 25%Cr super duplex stainless steel at different levels of the DO and chloride content (Cl-). The DO levels examined were 20 50 and 100ppb in a range of chloride ion concentrations (up to 152g/L Cl-) at temperatures of 50 and 60°C. The test results are reported in this paper.

Key words: oxygen control, pitting corrosion, UNS S31603, UNS S32750.

It is well established that the corrosion rate of carbon/low alloy steels in aqueous solutions (e.g. seawater) is affected by the concentration of dissolved oxygen (DO) along with other environmental factors including temperature chloride ion concentration pH etc. Several models have been developed and used to predict the corrosion rate of carbon steels at different DO levels. However carbon/low alloy steels cannot offer sufficient corrosion resistance in saline solutions at high temperatures (e.g. produced water systems in the oil field) leading to excessive metal loss due to the high corrosion rates. In such cases corrosion resistant alloys (CRAs) may offer a more cost effective/long-term solution. However there have been cases that CRAs were used with the premise that they were immune to corrosion whereas CRAs suffer from localised corrosion in oxygen-containing saline solutions.Depending on the grade of CRAs employed the tolerance level of the DO may vary e.g. a lower level for lower grades of stainless steels (e.g. 316/316L austenitic stainless steel (ASS) and a slightly higher level for higher grades (e.g. 25%Cr superduplex stainless steel (SDSS). However there is a lack of defined DO limits on CRA applications where the materials are considered to be ‘safe’ (free of corrosion) in the operation system.In order to establish the DO limits pitting and crevice corrosion tests were carried out for 316L austenitic stainless steel and 25%Cr super duplex stainless steel at different levels of the DO and chloride content (Cl-). The DO levels examined were 20 50 and 100ppb in a range of chloride ion concentrations (up to 152g/L Cl-) at temperatures of 50 and 60°C. The test results are reported in this paper.

Key words: oxygen control, pitting corrosion, UNS S31603, UNS S32750.

Product tags
Also Purchased
Picture for Evaluation of the Effect of Oxygen on CRA Materials
Available for download

51318-10799-Evaluation of the Effect of Oxygen on CRA Materials

Product Number: 51318-10799-SG
Author: Arwa Al Wahaibi / Talal Al Nabhani / Pedro Rincon Flores / Nassar Al Behalni
Publication Date: 2018
$20.00

This paper will present the testing results and the effect of oxygen on Austenitic Stainless Steel Grade 316L, Duplex Stainless Steel (22% Cr DSS) and Super Duplex Stainless Steel (25% Cr SDSS).
Picture for Comprehensive Approach to Oxygen Corrosion Analysis of Water Injection Systems
Available for download

Comprehensive Approach to Oxygen Corrosion Analysis of Water Injection Systems

Product Number: 51315-5962-SG
ISBN: 5962 2015 CP
Author: Troy Eggum
Publication Date: 2015
$0.00
Picture for 02270 Corrosion Consequences of Oxygen Entry...
Available for download

02270 Corrosion Consequences of Oxygen Entry Into Oilfield Brines

Product Number: 51300-02270-SG
ISBN: 02270 2002 CP
Author: Richard L. Martin
$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