Nace Sp0170 Pdf 2021 ^new^ Info

(formerly NACE International)

Industry professionals following SP0170 typically employ one or more of the following primary protection methods: Nitrogen Purging

Maintaining equipment at temperatures above the dew point. nace sp0170 pdf 2021

: Moving beyond lab tests to capture the "environmental realism" of startup and shutdown transients. Material Specifics

| 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 | The Soda Ash (Alkaline) Wash Because alkaline solutions

is a Standard Practice published by NACE International (now merged into AMPP ) titled "Protection of Austenitic Stainless Steels and Other Austenitic Alloys from Polythionic Acid Stress Corrosion Cracking During a Shutdown of Refinery Equipment" .

(subscription-based access for enterprises) nace sp0170 pdf 2021

Keeping the equipment dry prevents the reaction needed to form the acid.

The standard outlines specific procedures that should be implemented before a shutdown or as soon as possible after opening the equipment to the atmosphere. A. The Soda Ash (Alkaline) Wash

Because alkaline solutions can introduce risk of chloride stress corrosion cracking, the standard mandates strict limits on chloride concentrations within the wash water and requires the addition of corrosion inhibitors. 3. Dehumidification / Dry Air (Excluding Liquid Water)