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A: Approximately every 5-7 years. The last major revision was 2020. Always check AMPP.org for reaffirmation or revision status.

The core value of NACE SP0170 lies in its mitigation strategies. When you download the standard, you will find detailed procedures for: nace sp0170 pdf

NACE SP0170 (formerly designated RP0170 before the society renamed its “Recommended Practices” to “Standards Practices”) is titled: “Protection of Austenitic Stainless Steels and Other Austenitic Alloys from Polythionic Acid Stress Corrosion Cracking (SCC) During Shutdowns and Start-ups.” A: Approximately every 5-7 years

However, its most widely cited application goes beyond polythionic acid. The standard has become the go-to industry reference for: In simple terms: When you have a carbon

In simple terms: When you have a carbon steel pipe or vessel handling hot, sulfur-containing hydrocarbons (typical in crude units or hydrotreaters), the weld area is chemically different from the base metal. It corrodes much faster. NACE SP0170 tells you how to stop that—usually by applying a corrosion-resistant alloy (CRA) weld overlay.