How many measurements are taken per reading when using profile tape for profiles below 5 mils?

When using profile tape to measure surface profiles below 5 mils, it is standard practice to take three measurements for each reading. This approach ensures a more accurate representation of the surface profile by accounting for any variations that may occur across the measured area.

Taking multiple measurements helps mitigate the influence of anomalies or inconsistencies in the surface texture. By averaging three measurements, inspectors can provide a more reliable and precise assessment of the surface profile, which is critical in ensuring proper adhesion and performance of coatings. This practice is aligned with industry standards that emphasize thoroughness and accuracy in surface preparation assessments, especially in contexts such as shipbuilding where quality control is paramount.

In contrast, fewer measurements may lead to an incomplete understanding of the profile, potentially compromising the effectiveness of the applied coatings.