If a wet chemical wash is undesirable (for example, in catalyst-filled reactors or systems sensitive to water retention), NACE SP0170 allows for the exclusion of moisture.
It applies specifically to shutdowns where sulfur-rich equipment is exposed to air and moisture, typically in catalytic reformers, hydrotreaters, and crackers, as outlined in the NACE SP0170 standard. What is the difference between NACE RP0170 and SP0170? nace sp0170 pdf
The standard dictates a multi-layered defense system, categorizing procedures based on whether the equipment will be opened, kept under a blanket, or chemically neutralized. 1. Nitrogen Blanketing If a wet chemical wash is undesirable (for
PTA-SCC is notoriously rapid, capable of causing intergranular structural failure within hours of a system being breached and exposed to air. Core Mitigation Strategies in NACE SP0170 Core Mitigation Strategies in NACE SP0170 Years later,
Years later, when the next revision of SP0170 was circulated for public comment, Maya kept a single printed copy with the yellowed sticky note scanned and clipped inside. She submitted a concise proposed change: language encouraging site-specific overlay checks and recognition of mobile or transient measurement techniques where static coupons and fixed probes might miss early damage. She attached anonymized case studies from Site 7 showing how supplemental actions prevented a major shutdown.
Convert the standard into a one-page checklist for operators. Include hold points for pH testing and visual drying inspection.
