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The official, current version of the standard is available through . You can also purchase the NACE SP0170-2012 or newer versions from trusted technical standard distributors like ANSI. Does NACE SP0170 apply to all shutdowns?
NACE SP0170 is a standards-guidance document focused on welding practices for nickel-chromium-molybdenum and nickel-chromium alloys commonly used in corrosive-service equipment (e.g., sour service, hydrogen sulfide exposure). It provides recommendations to ensure weld quality, corrosion resistance, and mechanical integrity for these alloy systems when used in oil, gas, chemical, and related industries.
PTA-SCC is notoriously rapid, capable of causing intergranular structural failure within hours of a system being breached and exposed to air. Core Mitigation Strategies in NACE SP0170 nace sp0170 pdf
Washing the internal surfaces of equipment with an alkaline solution, typically a soda ash ( Na2CO3cap N a sub 2 cap C cap O sub 3 ) solution, usually within a concentration range of
For detailed information, the NACE SP0170 standard can be accessed in PDF format through various channels:
: Early application of CP can significantly reduce the long-term maintenance and repair costs associated with corrosion damage. Do you need detailed chemistry specifications for the
To successfully deploy NACE SP0170 protocols during a refinery turnaround, asset integrity managers should integrate the following steps into their execution plans: Action Item NACE SP0170 Alignment
Air introduced into the system must be dehumidified to a very low dew point (typically below -18°C or 0°F).
, Protection of Austenitic Stainless Steels and Other Austenitic Alloys from Polythionic Acid Stress Corrosion Cracking During a Shutdown of Refinery Equipment , provides proven methods to prevent cracking in sensitive materials. Why is NACE SP0170 Critical? Does NACE SP0170 apply to all shutdowns
Using dry nitrogen to exclude oxygen, preventing the reaction that forms PTA.
) mixed with water is circulated through or sprayed onto the equipment. The alkaline solution chemically neutralizes any polythionic acid the moment it forms.
The standard typically specifies a 1% to 2% soda ash solution. A surfactant (wetting agent) is often added to help the solution penetrate heavy coke or sludge layers and wet the underlying metal surfaces.