This standard is issued under the fixed designation D ; the number 1 This practice is under the jurisdiction of ASTM Committee D01 on Paint and. Related. In nearly the same timeframe, the version of ASTM D, “Standard Practice for Nondestructive Measurement of Dry Film Thickness of. ASTM D describes three operational steps that must be performed prior to coating thickness measurement to help assure the reliability of.
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First, once the surface is coated for ast, with a primeran uncoated surface may no longer be available for subsequent gage adjustments, so the user may want to have a similar uncoated surface prepared and reserved for future gage adjustments on a given project.
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. For areas of coating to 1, square feet, three random areas are selected and measured. The number of areas that must be measured for coating thickness varies, depending on the size of the coated area.
Measuring Coating Thickness According To SSPC-PA2 – Update KTA University
SSPC-PA 2 contains three definitions that are critical to understanding this next area of discussion. Verifying accuracy of Qstm 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.
This measured distance is displayed as coating thickness by the gages.
The total number of spot and area measurements is based on the total square footage of pipe on the cart or rack. Second, some Type 2 gages cannot be adjusted.
Measuring Dry Film Coating Thickness According to SSPC-PA 2KTA University
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Type 1 coating thickness gages should never be adjusted by the user. You are not calibrating the coating thickness gage, but rather verifying accuracy, then adjusting.
If a one-point verification procedure is adopted, the coated standard should be selected based on the intended range of use. The BMR is the effect of substrate roughness on a coating thickness-measuring gage. Keane Award of Merit. I am assuming you are using an electronic gage: 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 c7091. The following c7091 guidance is provided for measuring coating thickness on larger surfaces.
Acceptable spot measurements are defined by the minimum and maximum values in the contract documents. For example, if the intended use is between 4 and 6 aetm, then a 5-mil coated standard is appropriate. August 31, at 6: Acceptable spot measurements are defined by the minimum and maximum values in the contract documents.
Measuring Coating Thickness According To SSPC-PA 2 – Update 2015
Accuracy statements provide the performance capability across the full functional measurement range of the gage. These gages x7091 electronic circuitry to convert a reference signal into coating thickness and are more popular than Type 1 gages.
Subject to agreement between the buyer and the seller, a piece of coated substrate may also be used as a project-speci?
This practice is intended to supplement the manufacturers’ instructions for the manual operation of the gages and is not intended asym replace them.
Spot measurements are obtained on repeating structural units or elements of structural units until two consecutive units in each direction are conforming or until there are no more units to test. Information Regarding Verification of Accuracy and Adjustment added.
August 26, at 2: This culminates in a total of 75 spot measurements 15 x 5 and a minimum of gage readings 15 astj 5 x 3. While the gage may be out of tolerance by 0.