SSPC PA 2

Abstract

This standard describes a procedure for determining shop or field conformance to a specified coating dry film thickness (DFT) range on ferrous and non-ferrous metal substrates using nondestructive coating thickness gages (magnetic and electronic) described in ASTM D 7091.&#160; <br>The procedures for adjustment and measurement acquisition for two types of gages: "magnetic pull-off" (Type 1) and "electronic" (Type 2) are described in ASTM D 7091.&#160; <br>This standard defines a procedure to determine whether dry coatings conform to the minimum and the maximum thickness specified. See Note 11.1 for an example of a possible modification when measuring dry film thickness on overcoated surfaces.&#160; <br>This document is not intended to prescribe a frequency of coating thickness measurement for a coating failure investigation¹.&#160; <br>This document contains the following non-mandatory appendices: <br><strong>Appendix</strong> 1 - Numerical Example of Average Thickness Measurement <br><strong>Appendix</strong> 2 - Methods for Measuring Dry Film Thickness on Steel Beams (Girders) <br><strong>Appendix</strong> 3 - Methods for Measuring Dry Film Thickness for a Laydown of Beams, Structural Steel, and Miscellaneous Parts after Shop Coating <br><strong>Appendix</strong> 4 - Method for Measuring Dry Film Thickness on Coated Steel Test Panels <br><strong>Appendix</strong> 5 - Method for Measuring Dry Film Thickness of Thin Coatings on Coated Steel Test Panels that Have Been Abrasive Blast Cleaned <br><strong>Appendix</strong> 6 &#8211; Method for Measuring the Dry Film Thickness of Coatings on Edges <br><strong>Appendix</strong> 7 &#8211; Method for Measuring Dry Film Thickness on Coated Steel Pipe Exterior <br><strong>Appendix</strong> 8 &#8211; Examples of the Adjustment of Type 2 Gages Using Shims <br>This standard is not intended to be used for measurement of thermal spray coatings. The thickness measurement procedures for these coatings are described in SSPC-CS 23.00². <br>¹ The number and location of measurements during a coating failure investigation may be more or less frequent than described by this standard. <br>² CS 23.00/AWS C2.23M/NACE No. 12, Specification for the Application of Thermal Spray Coatings (Metallizing) of Aluminum, Zinc, and Their Alloys and Composites for the Corrosion Protection of Steel is available online at