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RP0170-1985 - Protection of Austenitic Stainless Steel From Polythionic Acid Stress Corrosion Cracking During Shutdown of Refinery Equipment-HD1985

Picture for RP0170 - Protection of Austenitic Stainless Steel From Polythionic Acid Stress Corrosion Cracking During Shutdown of Refinery Equipment-HD1985
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Methods to protect austenitic stainless steel from polythionic acid stress corrosion cracking (SCC) found to occur during downtimes and contiguous shutdown and start-up periods.  Historical Document 1986

Product Number: 21002-HD1985
Author: NACE
Publication Date: 1983
Industry: Corrosion Monitoring and Control
$179.00
$179.00
$179.00

This recommended practice provides methods to protect austenitic stainless steel from polythionic acid stress corrosion cracking (SCC) found to occur during downtimes and contiguous shutdown and start-up periods. The practice is directed toward preventing SCC by polythionic acids formed by the reaction of sulfide corrosion products with oxygen (air) and water. For practical purposes, it should be assumed that such acids can be formed by reaction of air and water with oxidizable sulfur compounds (H 2 S, metal sulfides, S).

Basic protection methods include: avoidance of oxygen (air) entry, prevention of liquid water formation, and alkaline wash of surfaces to be exposed to prevent polythionic acid formation.

This recommended practice is intended primarily for desulfurizing, hydrocracking, and reforming processes where the incidence of polythionic acid sec has been comparatively high. It can be applied to other units using austenitic stainless steel; however, the user must consider other factors such as the effect of the alkaline chemicals on catalysts. For the purposes of this standard, related Ni-Cr-Fe alloys that are susceptible to polythionic acid sec are included in the term "austenitic stainless steel."

The techniques described herein are not designed to remove chloride deposits, but will minimize the possibility of chloride SCC by the wash solutions. Since units subject to polythionic acid SCC may contain chloride deposits, measures should be taken to remove these deposits.

This revision of NACE standard RP0170-70 was prepared by NACE Task Group T-8-6 and is published by NACE under the auspices of Group Committee T-8 on Refining Industry Corrosion. This revised standard updates and supersedes RP0170- 70 entitled

"Protection of Austenitic Stainless Steel in Refineries Against Stress Corrosion Cracking By Use of Neutralizing Solutions During Shut Down," published in 1970.

This recommended practice provides methods to protect austenitic stainless steel from polythionic acid stress corrosion cracking (SCC) found to occur during downtimes and contiguous shutdown and start-up periods. The practice is directed toward preventing SCC by polythionic acids formed by the reaction of sulfide corrosion products with oxygen (air) and water. For practical purposes, it should be assumed that such acids can be formed by reaction of air and water with oxidizable sulfur compounds (H 2 S, metal sulfides, S).

Basic protection methods include: avoidance of oxygen (air) entry, prevention of liquid water formation, and alkaline wash of surfaces to be exposed to prevent polythionic acid formation.

This recommended practice is intended primarily for desulfurizing, hydrocracking, and reforming processes where the incidence of polythionic acid sec has been comparatively high. It can be applied to other units using austenitic stainless steel; however, the user must consider other factors such as the effect of the alkaline chemicals on catalysts. For the purposes of this standard, related Ni-Cr-Fe alloys that are susceptible to polythionic acid sec are included in the term "austenitic stainless steel."

The techniques described herein are not designed to remove chloride deposits, but will minimize the possibility of chloride SCC by the wash solutions. Since units subject to polythionic acid SCC may contain chloride deposits, measures should be taken to remove these deposits.

This revision of NACE standard RP0170-70 was prepared by NACE Task Group T-8-6 and is published by NACE under the auspices of Group Committee T-8 on Refining Industry Corrosion. This revised standard updates and supersedes RP0170- 70 entitled

"Protection of Austenitic Stainless Steel in Refineries Against Stress Corrosion Cracking By Use of Neutralizing Solutions During Shut Down," published in 1970.

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Picture for RP0173-Collection and Identification of Corrosion Products-HD 1973
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RP0173-1973, Collection and Identification of Corrosion Products

Product Number: 53014-HD1973
Author: NACE
Publication Date: 1973
$179.00

This recommended practice provides guidelines which are applicable to most situations in which corrosion products are to be collected and analyzed. Historical document 1973
Picture for RP0170 - Protection of Austenitic Stainless Steels and Other Austenitic Alloys from Polythionic Acid Stress Corrosion Cracking during Shutdown of Refinery Equipment-HD1993
Available for download

RP0170-1993- Protection of Austenitic Stainless Steels and Other Austenitic Alloys from Polythionic Acid Stress Corrosion Cracking during Shutdown of Refinery Equipment-HD1993

Product Number: 21002-HD1993
Author: NACE
Publication Date: 1993
$179.00

Methods to protect austenitic stainless steel and other austenitic alloys from polythionic acid stress corrosion cracking (SCC) occurring during downtimes and contiguous shutdown and start-up periods. Historical Document 1993
Picture for RP0170 - Protection of Austenitic Stainless Steels and Other Austenitic Alloys from Polythionic Acid Stress Corrosion Cracking during Shutdown of Refinery Equipment-HD1997
Available for download

RP0170-1997 - Protection of Austenitic Stainless Steels and Other Austenitic Alloys from Polythionic Acid Stress Corrosion Cracking during Shutdown of Refinery Equipment-HD1997

Product Number: 21002-HD1997
ISBN: 1-57590-039-4
Author: NACE International
Publication Date: 1997
$179.00

Methods to protect austenitic stainless steel and other austenitic alloys from polythionic acid stress corrosion cracking (SCC) occurring during downtimes and contiguous shutdown and start-up periods. Historical Document 1997
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