Nace Sp0170 Pdf - 2021

: Using alkaline "soda ash" washes to neutralize any acidic species that form on the metal surface. Dehumidification

This is the most common method specified in the standard. It involves thoroughly washing the affected equipment with a dilute alkaline solution, typically sodium carbonate. The alkaline solution neutralizes any polythionic acid that may have formed, rendering it harmless. The standard provides critical details on: nace sp0170 pdf 2021

At its core, this technical document is a survival guide for massive oil refinery components—like hydrotreating reactors and piping—during their most vulnerable moments: . The Story of a Shutdown : Using alkaline "soda ash" washes to neutralize

(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 . The alkaline solution neutralizes any polythionic acid that

To eliminate moisture and oxygen, thus preventing the formation of polythionic acids. 2. Alkaline Washing (Soda Ash Treatment)

PTA is not typically present during normal refinery operations. Instead, it forms during shutdowns or turnarounds when the following sequence occurs: