Nace — Sp0170 Pdf 2021

As of 2025, the official NACE SP0170 PDF 2021 costs approximately $150–$250 for members (less if you join AMPP). For a piece of equipment that costs millions, this is a trivial investment.

The is a critical framework used in petroleum refineries to protect austenitic stainless steels from polythionic acid stress corrosion cracking (PTA SCC) during equipment shutdowns.

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 nace sp0170 pdf 2021

When equipment must be opened for maintenance or catalyst dumping, nitrogen blanketing is impossible. Workers must wash the internal surfaces with an to neutralize any polythionic acid as it forms.

During normal refinery operations, hydroprocessing units (like hydrocrackers, hydrotreaters, and desulfurizers) process sulfur-heavy hydrocarbon streams at elevated temperatures. Sulfur species react with the iron, nickel, and chromium in steel to form stable metal sulfide scales along the internal surfaces of the piping and vessels. As of 2025, the official NACE SP0170 PDF

If you work for an EPC firm or major operator, they likely have an enterprise subscription. Check your internal document portal before purchasing individually.

However, as of 2025, remains the active, current standard. A 2024 revision has not been released; typical cycles are 5–8 years. NACE SP0170-2021 – Zinc Thermal Spray for Concrete

Injecting dry air (dehumidified air) into the vessel immediately upon shutdown to prevent condensation during cooling.

: Maintaining the relative humidity below a critical threshold (typically 40%) to ensure liquid water cannot form. Pro-Tip for Operators

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NACE SP0170 is critical for preventing sudden failures during maintenance.