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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Recently I had problem while calibrating. This method is used when the largest dimension of the unit is less than 10 feet. Therefore, it is important for the specifier to indicate an acceptable range for each coating layer, as the coating may not perform at the lower thickness.
Measuring Dry Film Coating Thickness According to SSPC-PA 2
For areas containing less than square feet of coated surface, every square-foot area must be measured for coating thickness. Even if a project speci? 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. October 16, at 2: References to the frequency of measurements were removed from the ASTM standard.
Coating thickness shall be measured in accordance with SSPC: Acceptable spot measurements are defined by the minimum and maximum values in the contract documents. Correction for Base Metal Reading if acquired. 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.
These readings represent the effect of the substrate conditions on the coating thickness measurement device.
Measuring Coating Thickness According To SSPC-PA2 – Update KTA University
Updates to SSPC and other industry-provided inspector training and certification courses and the associated instructor education will be critical to fully understanding and effectively communicating the requirements of this highly regarded industry standard. Gage Calibration, Accuracy Verification and Adjustment.
This average BMR is then deducted from subsequent coating thickness measurements to remove any effect of the base metal surface and its conditions. The gage must be placed directly on the coated surface to obtain a measurement. 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.
While their use has declined, they are aastm readily available and used by some. For gages measuring on d70911 substrates, the magnetic induction or Hall-effect principles determine the effect on the magnetic? The average of the gage readings is considered a spot measurement. All definitions related to gage calibration, accuracy and adjustment are incorporated by d791 in ASTM D Second, some Type 2 gages cannot ast adjusted.
Measuring Dry Film Coating Thickness According to SSPC-PA 2KTA University
Within each area, five randomly spaced spots are selected. January 26, at Adjusting Type 2 gage using a measured shim on the surface to which the coating will be applied This step sounds reasonably straightforward but poses several hidden challenges. 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.
Information Regarding Verification of Accuracy and Adjustment added. Communicating the new requirements of this standard to the industry is challenging but essential.
Accuracy statements frequently include a? For these gages, a permanent magnet is brought into direct contact with the coated surface.
If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee satm Standards, at the address shown below.
I am assuming you are using an electronic gage:. 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. The user of this equipment must be knowledgeable in the proper operation of these devices, including methods for verifying the accuracy of the ast, prior to, during and after use as well as measurement procedures.
For areas of coating exceeding 1, square feet, three random areas are selected from the first 1, square feet, plus one additional area for each additional 1, square feet. Equipment manufacturers produce nondestructive coating thickness testing gages that are used to measure the cumulative or individual thickness of the coating layers, after they are dry. For best accuracy when measuring with magnetic induction principle gages, consider the following: Photos courtesy of Turner Industries Group, L.
If a non-conforming area is identified, spot measurements are made at 5-foot intervals in eight equally spaced directions radiating outward from the nonconforming area as shown in Figure 13 below. A one-year calibration interval is a typical starting point suggested by gage manufacturers. The total number of spot and area measurements is based on the total square footage of pipe sstm the cart or rack.
For example, if the intended use is between 4 d791 6 mils, then a five-mil coated standard is appropriate.