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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ASTM D describes three operational steps that must be performed prior to coating thickness measurement to help assure the reliability of the measurements. Before measuring coating thickness on edges, the user should verify the gage and probe for accuracy by placing a thin, d091 shim certified or measured onto the prepared, uncoated edge.
Too many folks simply think if they can get a 2.
Measuring Coating Thickness According To SSPC-PA2 – Update KTA University
Special tensioned ring shims are also available. ASTM D their uses and how to apply them correctly. Depending upon the application, the individual gage readings may also be recorded. 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 Figures 7 and 8. The d091 force of attraction to the steel substrate beneath the coating asrm opposed by a spring or coil.
One of the issues that needs to be explained and discussed is using Test-Tex paper for measuring profile. Type 1 gages should not be used on soft or tacky coatings, as the magnet may adhere to the coating causing false low measurements, or coating materials may dry on the magnet causing false high measurements.
The user of this equipment must be knowledgeable in the proper operation of these devices, including methods for verifying the accuracy of the equipment prior to, during and after use as well as measurement procedures.
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. Spot measurement definition was expanded. The two documents are designed to be used in conjunction with each another.
Adjusting Type 2 gage using a measured shim on the surface to which the coating will be applied. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. 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.
Measuring Dry Film Coating Thickness According to SSPC-PA 2
I am assuming you are using an electronic gage:. The average of the gage readings is considered a spot measurement.
Place the gage probe on a certified coated standard and adjust the gage as necessary. Your email address will not be published.
Measuring Coating Thickness According To SSPC-PA 2 – Update 2015
Gage operation should be veri? Five different Coating Thickness Restriction Levels established. It describes the methods and recommended frequency for verifying the accuracy of gages and for adjusting optimizing the equipment, describes a frequency for measuring the thickness of the coating s and lists the reporting recommendations.
However, because Type r7091 gages are non-linear, one cannot assume a linear mil-for-mil correction value across the full range of the gage.
Photos courtesy of Turner Industries Group, L. Since Type 1 gages cannot be?
The force d77091 the permanent magnet to the ferrous base is inversely proportional to the thickness of the coating layer s between the magnet and the ferrous substrate.
Appendix 7 was added to accommodate pipe coaters that need to determine d709 thickness conformance on non-flat or non-plate areas, including smaller pipe sections on a cart or rack and longer pipe spools. Then I calibrated by keeping the same on a metal surface, which resulted in a 0.
Instrument Calibration Step 2: Historical Version s – view previous versions of standard. The actual minimum and maximum spot and area thickness requirements are shown in Figure 12 for each of the five restriction levels.
Use of the gage or the d701 outside of this range may generate false coating 7d091 measurements and may damage the instrument. The force necessary to pull the magnet from the surface is measured and converted to coating thickness, which is displayed on a scale on the gage.
Dry film thickness gages are calibrated by the equipment manufacturer, its authorized agent, or an accredited calibration laboratory under controlled conditions.
December 28, at 6: 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. These gages are categorized as “magnetic pull-off” d70991 “electronic. The BMR is the effect of substrate roughness on a coating thickness gage. Section 10, Reporting was added to the standard in For example, assume that the specification requires a four- to six-mil application of primer.
Measuring Dry Film Coating Thickness According to SSPC-PA 2KTA University
Within each area, five randomly spaced spots are selected. One conduit is through training and education. A one-year calibration interval is a typical starting point suggested by gage manufacturers. The number of spot measurements along the edge will vary depending on the total length of the coated edge.
Arguably the most critical section in the document, Section 8, describes how many areas to check, the size of the areas, the number of measurements to obtain in each area, and the steps to take if spot or area measurements do not conform to the specification. For the purpose of final acceptance of the total dry film thickness, 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.
The gage probe must be astj directly in a perpendicular position on the coated surface to obtain a measurement.