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Understanding the parameters that are used to comply with PA2 are a bit complicated. On the other hand, measuring Dry Film Thickness (DFT) is pretty easy!
BlastOne explains the parameters and explains how to use the Defelsko Positector 6000 DFT gauge in the above video.
Overview: Key Components of SSPC PA2 Compliance
Minimum & Maximum Thickness
Coating manufacturers specify a required minimum and maximum coating thickness to ensure durability and protection over time. These specifications are critical for the warranty of the facility. Some coatings might only require a minimum DFT, which means your primary focus would be on meeting or exceeding that minimum. In contrast, other situations may require adherence to both minimum and maximum thickness values.
Project Dimension Areas
For inspection purposes, divide your project into distinct Areas, each covering a minimum of 100 square feet. It’s essential to note that the requirements for measuring girders and beams may differ from flat surfaces, requiring additional attention during inspection.
Gage Readings
Within each inspected Area, select five random spots for measurement. At each spot, take three readings within an area of 1.5 inches or less in diameter. The average of these readings will provide the SPOT value. These measurements are critical for ensuring compliance with the coating’s thickness requirements, and they are taken using a precise magnetic instrument.
Spots
Inspect at least five SPOTS in each Area. The average of the gage readings at each spot is compared against the manufacturer’s specified DFT range. The acceptable range for these values typically lies between 80% of the minimum and 120% of the maximum DFT.
Spot Average
The final step involves averaging the SPOT values across all inspected spots in the Area. This Spot Average must meet the Minimum and Maximum DFT specifications set by the coating manufacturer to ensure the coating’s effectiveness and longevity.
DOWNLOAD THE SSPC PA2 POSTER
Use our BlastOne Inspecting to SSPC PA2 Standards poster to help with your DFT inspections.
