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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This was a great read. Two of the eight appendices were added in the remaining were in the edition and are highlighted below.
Obtaining base metal readings with Type 1 gage. This average BMR is then deducted from subsequent coating thickness measurements to remove any effect of the base metal surface and its conditions. Leave a Reply Cancel reply Your email address will not be published.
If a one-point verification procedure is adopted, the coated standard should be selected based on the intended range of use. The revisions took five years to complete. The magnitude of nonconforming thickness assessed by obtaining spot measurements in eight equally spaced directions radiating outward from the nonconforming area. 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 in a contract.
Change is never easy…. Any unusually high or low gage readings that are not repeated consistently are discarded. Pipe spools that are not loaded onto a rack or cart are typically measured individually Fig.
This method is used when the largest dimension of the unit is less than 10 feet. For decades, the industry was cautioned about taking coating thickness measurements within one inch of an edge, let alone on zstm edge.
Contained 6 appendices Contains 8 appendices. Addresses measurement of coatings on ferrous and non-ferrous metal surfaces. To help assure the reliability of the coating thickness measurements, ASTM D describes three operational steps d70991 must be performed before taking the measurements. The average of the gage readings is considered a spot measurement. Three sets of four circumferential spot measurements should be obtained on pipe spools less than 10 feet in length.
No further reproductions authorized. The contained information helps for easy understanding. The right to access the electronic files of ASTM Standards is for purposes of viewing for individual use only. The certified shim should be placed onto a smooth, uncoated metal surface to remove any effect of the surface roughness during this process. You will have access to the subscription x7091 our webpage standard. Some d70911 may have several small pipe sections, and the total coated surface may exceed square feet.
Webprint Printed and bound. The force necessary to pull the magnet from the surface is measured and converted to coating thickness, which is displayed on a scale on e7091 gage. August 31, at 6: There are three categories of coated area: Here, company employees can at all times access the products the company subscribes to.
The total number of spot and area measurements is based on the total square footage of pipe on the cart or rack. It describes the methods and recommended frequency for verifying the accuracy of gages and for adjusting optimizing the equipment and lists the reporting recommendations.
Measuring Dry Film Coating Thickness According to SSPC-PA 2
Acceptable sstm measurements are defined by the minimum and maximum values in the contract documents. Untilatm most recent technical changes were published in Maywith a minor editorial revision in to one of the appendices regarding measurements on test panels.
I am no doubt leaving out other bells and whistles, but my point is that while we are able to do a lot with the readings obtained, measuring DFT involves four or five basic steps. Coating thickness shall be measured in accordance with SSPC: You are not calibrating the coating thickness gage, but rather verifying accuracy, then adjusting.
Unusually high or low gage readings that cannot be repeated consistently are discarded. 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.
While the gage may be out of tolerance by 0.
Measuring Dry Film Coating Thickness According to SSPC-PA 2KTA University
If there is no place to measure in a given direction, then no measurement in that direction is asfm. The number of areas that must be measured for coating thickness varies, depending e7091 the size of the coated area. However, several Type 2 electronic gage manufacturers offer a variety of probe configurations, some of which are less affected by proximity to edges and are designed to better measure the thickness of coatings on edges Fig.
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 d70911 audible signal if a spot measurement is outside of the tolerance range.
Spot measurement definition was expanded. Remember me for one month.
The average of the three acceptable gage readings is the spot measurement; the average of five spot measurements is the area measurement. Register for a trial account. Are you sure you want to empty the cart? One of a variety of Type 2 gage probe configurations designed to better measure DFT of coatings on edges.
Level 1 is the most restrictive and does not allow for any deviation of spot or area measurements from the specified 7d091 and maximum thickness, while Level 5 is the least restrictive.