ASTM D7091 – 12 PDF
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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A test certificate or other documentation showing traceability to a national metrology institution is required. We have allowed it to become more technologically complex while making the data easier to analyze. February 7, at 2: 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. Start Webshop Product catalog Product astn.
Communicating the new requirements of this standard to the industry is challenging but essential. For example, assume that the specification requires a four- to six-mil application of primer. Less force is required to remove the magnet from a thick coating, while more force is required to remove the magnet from a thinner one.
ASTM grants you a license as follows: Print 1 2 3 4 5 page sstarting from page current page. They are awtm regarded to be faster, more accurate, and easier to use. References to the frequency of measurements were removed from the ASTM standard.
Don, The standard is independent of the substrate type, as asym as the substrate is a ferrous awtm non-ferrous metal.
This procedure also verifies that the probe configuration will accommodate the edge configuration before acquiring coating thickness data. With our Web Subscription service you are provided instant, secure access to your standards of choice.
The force necessary to pull the magnet from the surface is measured and converted to coating thickness, which is displayed ast a scale on the gage. Each spot consists of a 1. Addressed measurement of coatings on steel only. On complex structures or in other cases where making spot measurements at five-foot intervals is not practical, spot measurements are taken on repeating structural units or elements of structural units.
You are not calibrating the coating thickness gage, but rather verifying accuracy, then adjusting. One of a variety of Type 2 gage probe configurations designed to better measure DFT of coatings on edges. If spot measurement variances result in area measurements that do not meet the specification, then additional spot measurements are acquired radiating outward in eight directions from the nonconforming area to determine the magnitude of the non-conforming thickness.
Adjustment of Type 2 gages to compensate for substrate characteristics described later is typically performed using certified shims.
Contact us at salg standard. On a larger structure with multiple applicators, the measurement and documentation process could be extensive, so the approach was changed in the revision.
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It, too, was published in So if your reading is within the spec your fine. The electronic file may not be reproduced in any way.
Measuring Dry Film Coating Thickness According to SSPC-PA 2KTA University
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. Magnetic pull-off gages are categorized as Type 1 Fig. These readings represent the effect of the substrate conditions on the coating thickness measurement device. While individual gage readings that are unusually high or low and cannot be repeated consistently can be discarded, there are limitations on the thickness values representing the spot measurements the average of three gage dd7091.
As a result, obtaining single-point measurements may not accurately represent the actual coating system thickness. The moment new editions of the standards you monitor are released, changes are made, or appendixes are published, you will be alerted by email.
This process is described later in this article. Courtesy of SSPC If there is no place to measure in a given direction, then no measurement in that direction is necessary. The most current version of the ASTM standard focuses on proper gage use, while SSPC-PA 2 focuses primarily on the frequency of measurements and the acceptability of the acquired measurements.
One of a variety of Type 2 gage probe configurations designed to better measure DFT of coatings on edges Before measuring coating thickness 21 edges, the user should verify the gage and probe for accuracy by placing a thin, r7091 shim certified or measured onto the prepared, uncoated edge.
Measuring Dry Film Coating Thickness According to SSPC-PA 2
SSPC-PA2 prescribes a frequency of coating thickness measurement based on the size of the area coated. Untilthe most recent technical changes were published in Maywith a minor editorial revision in to one of the appendices regarding measurements on test panels. Then I calibrated by keeping the same on a metal surface, which resulted in a 0. Add this product to a web subscription service: However, several Type 2 electronic gage manufacturers offer a variety of probe configurations, some of which are less affected c7091 proximity to edges and are designed to better measure the thickness of coatings on edges Fig.