Background of SSPC PA 2; Overview and Purpose of SSPC-PA 2 (); Purpose of ASTM D ; Definitions; Gage Descriptions; Calibration & Verification. ASTM D focuses on gage use. • SSPC-PA 2 () focuses on acceptability of acquired measurements. • Both address ferrous and non-ferrous metal. This standard is issued under the fixed designation D ; the number immediately following the 1 This practice is under the jurisdiction of ASTM Committee D01 on Paint and . manufacturer’s specifications, n—a statement or set.
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Measured shims individually labeled with a stated thickness value commonly supplied with Type 2 gages can also be used for gage adjustment. Spot measurement definition was expanded. This practice is intended to supplement the manufacturers’ instructions for the manual operation of the gages and is not intended to replace them. The Table enables the specifier to select from five different restriction levels related to spot and area measurements.
For decades, the industry was cautioned about taking coating — measurements within one inch of an edge, let alone on an edge. The standard has been updated on multiple occasions. Yet the requirements of SSPC-PA 2 regarding gage calibration, verification of gage accuracy and adjustment procedures, the number of measurements to obtain, and the tolerance of the measurements are complex and should be fully understood by the specification writer before invoking PA 2 in a contract.
Within each area, five randomly spaced spots are selected. Any unusually high or low gage readings that are not repeated consistently are discarded. Leave a Reply Cancel reply Your email address will not be astn.
Adjustment of Type 2 gages to compensate for substrate characteristics described later is typically performed using certified shims.
Before measuring coating thickness on edges, the user should verify the gage and probe for accuracy by placing a thin, flexible shim certified or measured onto the prepared, uncoated edge. Method for Measuring the Dry Film Thickness of Coatings on Edges For decades, s7091 industry was cautioned about taking coating thickness measurements within one inch of an edge, let alone on an edge.
A frequency of measurement for coated steel beams girders and coated test panels is also provided in the appendices to SSPC-PA2. I would like to purchase a book regarding painting standards on thickness of painting.
Active view current version of standard. This measured distance is displayed as coating thickness axtm the gages. Verifying accuracy of Type 2 gage on a certified coated standard Fig.
Measurement of Coating Thickness Step 5: Five different Coating Thickness Restriction Levels established. Because the coating may not perform at the lower thickness, it is important for the specifier to indicate an acceptable range for each coating layer.
The above article was very informative and useful, thanks for sharing it. Appendix 7 was added to accommodate pipe coaters that need to determine coating thickness conformance on non-flat or non-plate areas, including smaller pipe sections on a cart or rack and longer pipe spools.
Measuring Dry Film Coating Thickness According to SSPC-PA 2KTA University
These steps are 1 gage calibration, 2 verification of gage accuracy and 3 gage adjustment. A minimum of three gage readings is obtained in each spot, culminating in a minimum of 15 gage readings within an area.
To help assure the reliability of the coating thickness measurements, ASTM D describes three operational steps that must be performed before taking the measurements.
Obtaining base metal readings with Type 1 gage. Register for a trial account. Level 1 is the most restrictive and does not allow for any deviation of spot or area measurements from the specified minimum and maximum thickness, while Level 5 is the least restrictive. Link to Active This link will always route to the current Active version of the standard. As a result, obtaining single-point measurements may not accurately represent the actual coating system thickness.
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All definitions related to gage calibration, accuracy and adjustment are incorporated by reference in ASTM D DFT of pipe spools not loaded on cart or rack are typically measured individually.
Measuring Dry Film Coating Thickness According to SSPC-PA 2
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Contained 6 appendices Contains 8 appendices. The author, Bill Corbett, has replied via email. Verification of gage accuracy is typically performed using certified coated thickness standards for Type 1 or Type 2 gages or certified shims Type 2 gages.
Verifying accuracy of Type 2 gage using a certified shim Adjusting Type 2 Gages The final step in the process is to adjust the gage on the surface to which the coating will be applied. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
The magnitude of nonconforming thickness assessed by obtaining spot measurements in eight equally spaced directions radiating outward from the nonconforming area.