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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Measuring Dry Film Coating Thickness According to SSPC-PA 2KTA University
I would like to purchase a book regarding painting standards on thickness of painting. Enter your account email address to request a password reset: Pipe spools that are not loaded onto a rack or cart are typically measured individually Fig. Another change in the version of the standard is the procedure for identifying nonconforming areas Fig. Your email address will not be published. The author, Bill Corbett, has replied via email.
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 21 readings. You need to log in before adding standards to the monitoring service. Two of the eight appendices were added in the remaining were in the edition and are highlighted below.
For these gages, a permanent magnet is brought into direct contact with the coated surface. 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.
The average of the gage readings d0791 considered a spot measurement. You will have access to the subscription via our webpage standard. August 26, at 2: In such cases, the user will need to obtain BMRs from the prepared, uncoated substrate described earlier for Type 1 gages.
Adjustment of Type 2 gages to compensate for substrate characteristics described later is typically performed using certified shims. Leave a Reply Cancel reply Your email address will not be published. Method for Measuring the Dry Film Thickness of Coatings on Astk For decades, the industry was cautioned about taking coating thickness measurements within one inch of an edge, let alone on an edge.
These gages were designed in the s. Please login to your authorized staff account to use this feature. Monitoring Standards monitoring is a free service designed for you who wish to be alerted of changes to or new editions of the standards required ast your work.
Acquisition of more than three gage readings within a spot is permitted.
Measuring Dry Film Coating Thickness According to SSPC-PA 2
This practice is intended to supplement the manufacturers’ instructions for the manual operation of the gages and is not intended to replace them.
The contained information helps for easy understanding. Measure the coating thickness. Are you sure you want to empty the cart? Recently I had problem while calibrating. Correction for Base Metal Reading if acquired.
This ensures that you are always up-to-date and saves you both time and money. aetm
On a larger structure with multiple applicators, the measurement and documentation process could be extensive, so the approach was changed in the revision. 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 range.
Verifying accuracy of Type 2 gage using a asmt shim. This average BMR is then deducted from subsequent coating thickness measurements to remove any effect of the base metal surface and its conditions.
This measured distance is displayed as coating thickness by the gages. With this service you are always guaranteed to have the latest edition available.
Three sets of four circumferential spot measurements should be obtained on pipe spools less than 10 feet in length. The average of the acceptable gage readings is the spot measurement. One type of magnetic gage referenced in original SSPC-PA 2 for measuring dft Figures courtesy of the atsm except where otherwise indicated. Yet the requirements of SSPC-PA 2 regarding gage calibration, verification of gage accuracy and adjustment procedures, the number of measurements to obtain, and the tolerance of the measurements are complex and should be fully understood by the specification writer before invoking PA 2 aetm a contract.
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.
Please sign into an account with a subscription to this content, or email for help at support madcad. This step sounds reasonably straightforward but poses several hidden challenges.
A frequency of measurement for coated steel beams girders and coated test panels is also provided in the appendices to SSPC-PA2.
I am assuming you are using an electronic gage: Each spot consists of a 1. The accuracy of Type 1 magnetic pull-off gages is verified by placing the gage probe asym a certified coated thickness standard Figs. For example, if the intended use is between 4 and 6 mils, then a five-mil coated standard is aastm. So if your reading is within the spec your fine. Adjustments to d7901 gage may or may not be required. 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 Six appendices from version included.
The d7901 curve may or may not cover the full range of the gage, but should cover the intended range of use.
A single instrument reading. No items in cart. 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. V7091 a one-point verification procedure is adopted, the coated standard should be selected based on the intended range of use. Spot measurement definition was expanded.