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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r7091 Remember me for one month. These gages use electronic circuitry to convert a reference signal into coating thickness and are more popular than Type 1 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.
Please email awtm back with price and where to purchase standards on paint thickness. Adjustment of Type 2 gages to compensate for substrate characteristics described later is typically performed using certified shims.
The gage reading is adjusted to match the thickness of the shim, which effectively removes any influence from the underlying surface.
However it will be important to place a measured shim onto the prepared, uncoated pipe and adjust the gage to match the shim thickness to remove any effect of the base metal. Three sets of four circumferential spot measurements should be obtained on pipe spools less than 10 feet in length. This procedure also verifies that the probe configuration will accommodate the edge configuration before acquiring coating thickness data.
Another change in the version of the standard is the procedure for identifying nonconforming areas Fig.
Measure the coating thickness. There were no books found for the applied search filters. For example, if the intended use is between 4 and 6 mils, then a five-mil coated standard is appropriate. Spot measurements are obtained in each direction up to the maximum surface area coated during the work shift until two consecutive conforming spot measurements are acquired in that direction, or until no additional measurements can be made.
With our Web Subscription service you are provided instant, secure access to your standards of choice. The average of the gage readings is considered a spot measurement.
Measuring Dry Film Coating Thickness According to SSPC-PA 2KTA University
Keane Award of Merit. The operating principle is simple. The right to atm the electronic files of ASTM Standards is for purposes of viewing for individual use only. Place the gage probe on a certified coated standard and adjust the gage as necessary. One of a variety of Type 2 gage probe configurations designed to better measure DFT of coatings on edges Before measuring coating thickness on edges, the user should verify the gage and probe for accuracy 7d091 placing a thin, flexible shim certified or measured onto the prepared, uncoated edge.
A total of 15 areas must be measured three in the first 1, square feet and one additional area in each of the 12 remaining 1,square-foot areas or portions thereof. Pipe spools that are not loaded onto a rack or cart are typically measured individually Fig. Your email address will not be published. I am assuming you are using an electronic gage:. These readings represent the effect of the substrate conditions on the coating thickness measurement device.
Non-compliant areas are demarcated dd7091 removable chalk or another specified marking material and documented. If you need to be able to add standards to the monitoring service, you must register as a user with your own username and password. January 22, at 7: These steps are 1 gage calibration, 2 verification of gage accuracy and 3 gage adjustment.
If no Restriction Level is specified, then the default is Level 3, which is based on the version of SSPC-PA 2 what many users of the standard have become accustomed to. To guard against measuring with an inaccurate gage, SSPC-PA 2 requires that gage accuracy be verified at a minimum at the beginning and end of each work shift according to the procedures described in ASTM D SSPC-PA 2 states that a minimum of 10 arbitrarily spaced locations should be measured one reading per location and then averaged.
In the edition, if spot or area measurements were out of conformance, each square-foot area coated during the work shift had to be measured, and nonconforming areas had to be demarcated.
Coating thickness shall be measured in accordance with SSPC: A one-point or two-point accuracy verification procedure can be performed as described earlier for Type d091 gages.
References to the frequency of measurements were removed from the ASTM standard. You are not calibrating the coating thickness gage, but rather verifying accuracy, then adjusting.
The force necessary to pull the magnet from the surface is measured and converted to coating thickness, which is displayed on a scale on the gage. We can gather hundreds of gage readings in a relatively short time; batch the measurements; print the data or upload it to a computer for graphing; report the highest, the lowest, the mean, and standard deviation of the collected data; incorporate digital images of the structure or coated area; and even program the gage to produce an audible signal if a spot measurement is outside of the tolerance range.
It includes definitions of key terms, reference documents, the significance and use of the practice, the advantages and limitations of coating thickness gages, and a description of test specimens. For example, assume that the specification requires a four- to six-mil application of primer. ASTM grants you a license as follows: A one-point or two-point accuracy verification procedure can be performed; typically, the two-point verification provides greater accuracy.
However, several Type 2 electronic gage manufacturers offer a variety of probe configurations, some aatm which are less affected by proximity to edges and are designed to better measure the thickness of coatings on edges Fig. Method for Measuring the Dry Film Thickness of Coatings on Edges For decades, the industry was cautioned about taking coating thickness measurements within one inch of an edge, let alone on an edge.
Haarik, You are not asttm the coating thickness gage, but rather verifying accuracy, then adjusting.