SURFACE CLEANLINESS: BY WHOSE DEFINITION?

摘要

One of the most contentious inspection hold-points that a QC inspector can have when working with QA oversight is surface cleanliness after abrasive blast-cleaning.Not only are there different standards(SSPC/NACE joint standards vs.ISO 8501-1,”The Swedish Standard”)with different definitions,but the inspection of cleanliness ultimately hinges on a visual estimation of how much staining is present.This inspection is very subjective,but there is a solution.A February 2015 JPCL article1 compares and contrasts the SSPC/NACE joint standards and ISO 8501-1.Table 2 from that article summarizes the differences,and the author astutely points out that,”It is important to always adhere to the surface preparation standard that is written in the specification.”