ASTM D7091 - 12 PDF

ASTM D A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Scope 1. It includes de?

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In Stock. Need it fast? Ask for rush delivery. Most backordered items can be rushed in from the publisher in as little as 24 hours. Some rush fees may apply. Add to Cart. View Full Details and Buy. Complementary Documents and Links:. This practice describes the use of magnetic and eddy current gages for dry film thickness measurement. This practice is intended to supplement the manufacturers' instructions for the manual operation of the gages and is not intended to replace them.

It includes definitions of key terms, reference documents, the significance and use of the practice, the advantages and limitations of coating thickness gages, and a description of test specimens. It describes the methods and recommended frequency for verifying the accuracy of gages and for adjusting the equipment and lists the reporting recommendations.

Provisions for measuring on soft or tacky coatings are described in 5. Coating thickness can be measured using a variety of gages. These gages are categorized as "magnetic pull-off" and "electronic. This measured distance is displayed as coating thickness by the gages. Coating thickness can vary widely across a surface. As a result, obtaining single-point measurements may not accurately represent the actual coating system thickness.

SSPC-PA2 prescribes a frequency of coating thickness measurement based on the size of the area coated. A frequency of measurement for coated steel beams girders and coated test panels is also provided in the appendices to SSPC-PA 2.

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. The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard. This standard does not purport to address all of the safety concerns, if any, associated with its use. 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.

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Measuring Dry Film Coating Thickness According to SSPC-PA 2

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ASTM D7091

Click Here to Read the Updated Article. 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. We have allowed it to become more technologically complex while making the data easier to analyze. 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. 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. 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.

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ASTM D7091-13

Active view current version of standard. Other Historical Standards. Work Item s - proposed revisions of this standard. More D This practice is intended to supplement the manufacturers' instructions for the manual operation of the gages and is not intended to replace them. It includes definitions of key terms, reference documents, the significance and use of the practice, the advantages and limitations of coating thickness gages, and a description of test specimens.

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