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 describes the methods and recommended frequency for verifying the accuracy d701 gages and for adjusting optimizing the equipment and lists the reporting recommendations. Measurement of Coating Thickness Step 5: 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.
A frequency of measurement for coated steel beams girders and coated test panels is also provided in the appendices to SSPC-PA2. Another change in the version of the standard is the procedure for identifying nonconforming areas Fig. Contained a minimum gage accuracy requirement to qualify for use.
A minimum of three gage readings is obtained in each spot, culminating in a minimum of 15 gage readings within an area. These gages were designed in the s. This requirement makes Type 1 gages very difficult to use.
An area is defined as approximately square feet. Keane Award of Merit. ASTM D791 their uses and how to apply them correctly. 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. Kaunteya, Thank you for your question. Two of the eight appendices were added in the remaining were in the edition and are highlighted below.
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. The final step in the process is to adjust the gage on the surface to which the coating will be applied. Within each area, five randomly spaced spots are selected. Please login to your authorized staff account to use this feature. Content only available by subscription.
Measuring Dry Film Coating Thickness According to SSPC-PA 2
Then I calibrated by keeping the same on a metal surface, which resulted in a 0. Leave a Reply Cancel reply Your email address will not be published. Adjustment of Type 2 gages to compensate for substrate characteristics described later is typically performed using certified shims.
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 zstm, 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 asrm audible signal if a spot measurement is outside of the tolerance range.
This practice is intended to supplement the manufacturers’ instructions for the manual operation of the gages and is not intended to replace them. Inspection Instruments Pipeline Coatings — Volume 2: For example, if the intended use is between 4 and 6 mils, then a five-mil coated standard is appropriate. Enter your personal account email address to request a password reset: This method is used when the largest dimension of the unit is less than 10 feet.
Measuring Dry Film Coating Thickness According to SSPC-PA 2KTA University
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.
I feel empowered and have gained valuable knowledge. Will the surface on which we keep the calibrating tools affect the reading? The steps are incorporated by reference in SSPCPA 2 and are completed before obtaining coating thickness measurements to determine conformance to a specified coating thickness dd7091. We have allowed it to become more technologically complex while making the data d709 to analyze.
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 asstm the spot measurements the average of three gage readings.
One of a variety of Type 2 gage probe configurations designed to better measure DFT of coatings on edges.
January 22, at 7: Each spot consists of a 1. The electronic file may not be reproduced in any way. Enter your account email address to request a password reset: Print 1 2 3 4 5 page sstarting from page current page. Depending on the coating type and the prevailing service environment, the specifier can select the DFT restriction level for a given project.
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 You currently cannot view this content. The accuracy of Type 2 electronic gages can be verified by placing the gage probe onto a certified coated thickness standard described for Type 1 gages or certified shims Figs. SSPC-PA 2 has undergone significant changes in an attempt to make it more complete; more in concert with ASTM D; easier to use in the shop and field; and more flexible in providing the specifier with options for coating thickness restrictions based on the type of structure, the coatings to be applied, and the service environment.
There were no books found for the applied search filters. Method for Measuring Dry Film Thickness on Coated Steel Pipe Exterior Appendix 7 was added to accommodate pipe coaters that need to determine coating thickness conformance on non-flat or non-plate areas, including smaller pipe sections on a cart or rack and longer pipe spools.
While individual gage readings that are unusually high or low and cannot be repeated consistently can be discarded, c7091 are limitations on the thickness values representing the spot measurements the average of three gage readings. February 5, at 2: This step sounds reasonably straightforward but poses several hidden challenges. Isolation of nonconforming areas required measurement of each square foot area painted during the work shift.
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. Adjustments to the gage may or may not be required. For example, assume that the specification requires a four- to six-mil application of primer. He holds an A.