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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It, too, was published in This process is described later in this article. If a one-point verification procedure is adopted, the coated standard should be selected based on the intended range of use. Because the coating may not perform at ast, lower thickness, it is important for the specifier to indicate an acceptable range for each coating layer.
Updates to SSPC and other industry-provided inspector training and certification asfm and the associated instructor education will be critical to fully understanding and effectively communicating the requirements of this highly regarded industry standard.
Measuring Dry Film Coating Thickness According to SSPC-PA 2KTA University
This ensures that you are always up-to-date and saves you both time and money. Adjustments to the gage may or may not be required. If so which is the correct surface for calibrating?
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. 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.
A one-point or two-point accuracy verification procedure can be performed; typically, the two-point verification provides greater accuracy. To help assure the reliability of the coating thickness measurements, ASTM D describes three operational steps that must be performed before taking the measurements.
The moment new editions of the standards you monitor are released, changes are made, or appendixes are published, you will be alerted by email.
No items in cart. Kaunteya, Thank you for your question. The certified shim should be placed onto a smooth, uncoated metal surface to remove any effect of the surface roughness during this process.
Depending on the coating type and the prevailing service environment, the specifier can select the DFT restriction level for asrm given project. Courtesy of SSPC If there is no place to measure in a given direction, then no measurement in that direction is necessary. While the gage may be out of tolerance by 0. It includes definitions of key terms, reference documents, the significance and use of the practice, the advantages and limitations of d0791 thickness gages, and a description of test specimens.
The number of areas that must be measured for coating thickness varies, depending on the size of the coated area. The total number of spot and area measurements is based on the total square footage of pipe on the 112 or rack. Measure the coating thickness. SSPC-PA2 prescribes a frequency of coating thickness measurement based on the size of the area coated.
Verifying aetm of Type 2 gage on a certified coated standard Fig. ASTM grants you a license as follows: This method is used when the largest dimension of the unit is aetm than 10 feet. Your email address will not be published. For example, assume that the specification requires a four- to six-mil application of primer. Six appendices from version included.
Acceptability of Gage Readings, Spot Measurements, and Area Measurements 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 readings.
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. DFT of pipe spools not loaded on cart or rack are typically measured individually. The average of the gage axtm is considered a spot measurement.
This includes personalizing content and advertising. This procedure also verifies that the probe configuration will accommodate the edge configuration before acquiring coating thickness data. For the purpose of final acceptance of the total DFT, the cumulative thickness of all coating layers in each area must be no less than the cumulative minimum specified thickness and no greater than the cumulative maximum specified thickness.
If you have a large number of standards, a quantity discount applies, making the service even more desirable for companies. I am assuming you are using an electronic gage:.
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.
References to the frequency of measurements were removed from the ASTM standard. Isolation of nonconforming areas required measurement of each square foot area painted during the work shift. If you like to setup a quick demo, let us know at support madcad.
The governing specification is responsible for providing the user with the minimum and the maximum coating thickness for each layer, and for the total coating system.
January 28, at 5: 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.
Special attention will be given in the article to how PA 2 addresses the required number of coating thickness measurements; the acceptability of gage readings, spot measurements, and area measurements; nonconforming thickness; measuring DFT on coated edges; and measuring DFT on pipe exteriors.
The average of the three acceptable gage readings is the spot measurement; the average of five spot measurements is the area measurement.