Nace Sp0170 Pdf 2021 ⟶
To ensure effective corrosion prevention in pipelines, operators should follow best practices outlined in NACE SP0170 PDF 2021:
When unstabilized austenitic stainless steels are exposed to temperatures between 425°C and 815°C during operation, chromium carbides (
Official digital PDF downloads and printed versions of this standard can be secured directly through authorized nodes like the Accuris Standards Store NACE SP0170-2018 Page or the ANSI Webstore .
Refinery materials, inspection, and operations personnel reference this standard practice when planning turnarounds. The choice of protection method depends heavily on the specific asset class being handled: Equipment Asset Class Primary Risk Factors Recommended SP0170 Mitigation Path nace sp0170 pdf 2021
The most accurate and up-to-date information on NACE standards, including SP0170-2021, can typically be found by:
Fired heaters utilizing sulfur-bearing fuels under oxidizing conditions typically build protective chromium oxide (
This is a common field procedure where internal surfaces are washed with an alkaline solution to neutralize any acids that might form. The standard notes that field experience has demonstrated austenitic stainless steels are effectively protected when alkaline wash solutions are properly applied to all wetted surfaces. The standard notes that field experience has demonstrated
) and often includes a corrosion inhibitor like sodium nitrate ( NaNO3NaNO sub 3 ) to prevent chloride stress corrosion cracking ( Cl-SCCCl-SCC
A 2021 version of this standard is not available. The last published edition is NACE SP0170-2018, released in September 2018. The search term likely reflects an assumption of an annual update. You can verify this on the official AMPP (formerly NACE International) website, as well as on technical standards stores like enstandards.com or standardssupply.com where only the 2018 version is offered for purchase. It is also possible that a draft or ballot for a 2021 edition was considered in the past, but this never resulted in an official publication.
Massive internal surface areas with complex stainless steel fractionation trays. The search term likely reflects an assumption of
) is pumped into the system to maintain a slight positive pressure.
PTA SCC is a severe corrosion mechanism that particularly threatens equipment made from the common 300-series stainless steels (e.g., Types 304, 316, 321, 347) and their alloys. The cracking occurs when these materials are exposed to , which form from the reaction of:
| Parameter | Requirement (2021) | |-----------|--------------------| | | ≥ 99.5% Zn (per ASTM B833) | | Thickness (typical) | 250–500 µm (10–20 mils) | | Bond strength | ≥ 1.5 MPa (pull-off test) | | Porosity | ≤ 5% (image analysis or ferroxyl test) | | Electrical continuity | < 2 ohms between segments | | Current density | 5–20 mA/m² of anode surface |