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Monitor relative humidity continuously if using the dry-air method. Quality Control
NACE SP0170 is a published standard/technical publication available for purchase from NACE (now part of AMPP) or authorized standards distributors. For the official, complete, and binding guidance, obtain the current edition from the issuing organization.
NACE SP0170 PDF: A Comprehensive Guide to Protecting Austenitic Stainless Steel from Polythionic Acid SCC
The 2018 edition is the current, active standard, maintained by Task Group 173. While historical versions may be useful for research or understanding legacy equipment, you should always refer to the latest edition for current operations.
By following , refineries can prevent costly equipment failures and ensure a safer, more reliable restart after turnaround activities. What to do next:
: Utilizing dry air or nitrogen to prevent liquid water from forming on surfaces.
Inject the alkaline solution before steam-out procedures finish, or concurrently with the final cooling phase to catch sulfide transformation early.
Explains how PTA forms from sulfide deposits, moisture, and oxygen.
Understanding NACE SP0170: Protection Against Polythionic Acid SCC
Dehumidification equipment pumps dry air into the open structures, keeping the internal environment well below the water dew point.
Focuses specifically on austenitic stainless steels and austenitic alloys during shutdown.



Monitor relative humidity continuously if using the dry-air method. Quality Control
NACE SP0170 is a published standard/technical publication available for purchase from NACE (now part of AMPP) or authorized standards distributors. For the official, complete, and binding guidance, obtain the current edition from the issuing organization.
NACE SP0170 PDF: A Comprehensive Guide to Protecting Austenitic Stainless Steel from Polythionic Acid SCC
The 2018 edition is the current, active standard, maintained by Task Group 173. While historical versions may be useful for research or understanding legacy equipment, you should always refer to the latest edition for current operations.
By following , refineries can prevent costly equipment failures and ensure a safer, more reliable restart after turnaround activities. What to do next:
: Utilizing dry air or nitrogen to prevent liquid water from forming on surfaces.
Inject the alkaline solution before steam-out procedures finish, or concurrently with the final cooling phase to catch sulfide transformation early.
Explains how PTA forms from sulfide deposits, moisture, and oxygen.
Understanding NACE SP0170: Protection Against Polythionic Acid SCC
Dehumidification equipment pumps dry air into the open structures, keeping the internal environment well below the water dew point.
Focuses specifically on austenitic stainless steels and austenitic alloys during shutdown.

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