A positive pressure must be maintained continuously throughout the shutdown to prevent ambient air from leaking inward.
Yes. Following the merger of NACE International and SSPC to form AMPP in 2021, the standard may be rebranded as AMPP SP0170. However, the technical requirements remain consistent with the 2018 NACE version until a new revision is issued.
To ensure effective corrosion prevention in pipelines, operators should follow best practices outlined in NACE SP0170 PDF 2021:
NACE SP0170 is specifically designed to prevent . PTA SCC is a particularly dangerous failure mode because it can lead to catastrophic brittle fractures of equipment made of austenitic stainless steel, specifically during plant shutdowns or start-ups. nace sp0170 pdf 2021
) reacts with the steel elements to form (
(formerly RP0170) is the current standard for the Protection of Austenitic Stainless Steels and Other Austenitic Alloys from Polythionic Acid Stress Corrosion Cracking During a Shutdown of Refinery Units .
NACE SP0170-2021 – Zinc Thermal Spray for Concrete CP ✅ Min zinc purity: 99.5% ✅ Min bond: 1.5 MPa ✅ Thickness: 250–500 µm ✅ Max porosity: 5% ✅ Topcoat within 7 days if exposed to chlorides ✅ Activation required for high-alkali concrete (pH > 12.5) ✅ Do NOT use on unbonded prestressed strands ) reacts with the steel elements to form
Equipment has been exposed to sulfide scales at high temperatures. Sensitized material is suspected or confirmed. 3. Key Mitigation Methods Recommended by SP0170
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The Chemistry of Polythionic Acid Stress Corrosion Cracking (PTA SCC)
The operational atmosphere dictates the vulnerability of the asset: