This standard is issued under the fixed designation D ; the number 1 This practice is under the jurisdiction of ASTM Committee D01 on Paint and. Related. In nearly the same timeframe, the version of ASTM D, “Standard Practice for Nondestructive Measurement of Dry Film Thickness of. ASTM D describes three operational steps that must be performed prior to coating thickness measurement to help assure the reliability of.
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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. SSPC-PA 2 states that a minimum of 10 locations arbitrarily spaced should be measured one reading per locationthen averaged. By continuing to use our site, you accept our use of d70091 To learn more, click Read More to view our Privacy and Cookies Policy.
The base metal reading is measured, recorded and deducted from the thickness of each coat, in order to correctly state the thickness of the coating over the surface roughness. This standard was published over 10 years ago in However, since Type 1 gages are non-linear, one cannot assume a linear correction value across the full range of the gage.
This enables the specifier to select from five different restriction levels related to spot and area measurements. Leave a Reply Cancel reply Your email address will not be published. satm
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 a one-point verification procedure is adopted, the coated standard should be selected based on the intended range of use. This requirement makes Type 1 gages very difficult to use. Place the gage probe on a certified coated standard and adjust the gage as necessary. 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.
It is important to recognize however that simply because all of this has been researched and the technology is in place to measure quantify it, does not make it contractually binding.
Courtesy of SSPC If there is no place to measure in a given direction, then no measurement in that direction is necessary. For areas containing less than square feet of coated surface, every square-foot area must be measured for coating thickness. All references to the frequency of measurements were e7091 from the ASTM standard.
Measuring Coating Thickness According To SSPC-PA2 – Update KTA University
For decades, the industry was cautioned about taking coating thickness measurements within one inch of an edge, let alone on an edge. 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.
Measuring Dry Film Coating Thickness According to SSPC-PA 2KTA University
Kaunteya, Thank you for your question. Updates to SSPC and other industry-provided inspector training and certification courses and the associated instructor education will be critical to fully understanding and effectively communicating the requirements of this highly regarded industry standard.
For areas containing less than square feet of coated surface, every square foot area must be measured for coating thickness. Acquisition of more than three gage readings within a spot is permitted. That is, no allowance is made for variant spot measurements e.
For a given measurement direction or unit measurement, any compliant area or unit preceding a non-compliant area or unit is designated as suspect, and, as such, is subject to re-inspection after corrective measures are taken. One conduit is through training and education.
This measured distance is displayed as coating thickness by the gages. Depending on ast coating type and the prevailing service environment, the specifier can select the DFT restriction level for a given project. This practice does not address the use of ultrasonic coating thickness gages. The thickness of each layer must be measured after it is applied. Spot measurements are obtained on repeating structural units f7091 elements of d70991 units until two consecutive units in each direction are conforming or until there are no more units to test.
A one-point or two-point accuracy verification procedure can be performed; typically, the two-point verification provides greater accuracy. Pipe sections that are loaded onto a cart or rack can be considered a complete unit Figure The thickness of the coating is displayed digitally. V7091 carts may have several small pipe sections, and aztm total coated surface may exceed square feet.
The manually operated gages may be susceptible to human error caused by inadvertently turning the dial wheel past the point at which the magnet pulls from the surface, yielding a false low measurement. If there is no place to measure in a given direction, then no measurement in that direction is necessary. Secondly, some Type 2 gages aastm be adjusted. Pipe sections loaded onto a cart or rack can be considered a complete asgm Fig.
A total of 15 areas must be measured 3 in the first square feet and one additional area in each remaining square foot area or portion thereof; in this example This practice is intended to supplement the manufacturers’ instructions for the manual operation of the gages and is not intended to replace them.
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.