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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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. April 6, at Provisions d70911 measuring on soft or tacky coatings are described in 5. 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.
For example, if the intended use is between 4 and 6 mils, then a five-mil coated standard is appropriate. Please login to your authorized staff account to use this feature. Isolation of nonconforming areas required measurement of each square foot area painted during the work shift. The above article was very informative and useful, thanks for sharing it. The scale is not linear, as will be discussed below. You do not need to zero the gage.
One of a variety of Type 2 gage probe configurations designed to better measure DFT of coatings on edges Before measuring coating thickness on edges, the user should verify the gage and probe for accuracy by placing a thin, flexible shim certified or measured onto the prepared, uncoated edge. Three sets of four circumferential spot measurements should be obtained on pipe spools less than 10 feet in length.
Measuring Dry Film Coating Thickness According to SSPC-PA 2KTA University
A minimum of three gage readings is obtained in each spot, culminating in a minimum of 15 gage readings within an area. Less force is required to remove 122 magnet from a thick coating, while more force is required to remove the magnet from a thinner one.
The number of spot measurements along the edge will vary, depending on the total length of the coated edge. Haarik, D77091 are not calibrating the coating thickness gage, but rather verifying accuracy, then adjusting. Inspection Instruments Pipeline Coatings — Volume 2: Contained a minimum gage accuracy requirement to qualify for use.
ASTM D their uses and how to apply them correctly. So if your reading is within the spec your fine. While their use has declined, they are d701 readily available and used by some.
The electronic file may not be reproduced in any way. Thank sstm so much for the information on this page. Five different Coating Thickness Restriction Levels established.
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 Atm While individual gage readings that are unusually high or low and cannot be repeated consistently astn be discarded, there are limitations on the thickness values representing the spot measurements the average of three gage readings.
An area is defined as approximately square feet. Webprint Printed and bound. 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.
If no Restriction Level is specified, then the default awtm Level 3, which is based on the version of SSPC-PA 2 what many users of the standard have become accustomed to. D0791 for Measuring Dry Film Thickness on Coated Steel Pipe Exterior 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.
Your email address will not be published. The total number of spot and area measurements is based on the total square footage of pipe on the cart or rack. 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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Per Specification Conformance to Specified Thickness: Verifying accuracy of Type 2 gage using a certified shim Adjusting Type 2 Gages The final e7091 in the process is to adjust the gage on the surface to which the coating will be applied. A one-point or two-point accuracy verification procedure can be performed as described earlier for Type 1 gages. A one-year calibration interval is a typical starting point suggested by gage manufacturers.
Place the gage probe on a certified coated standard and d091 the gage as necessary. This was a great read. 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.
Measuring Dry Film Coating Thickness According to SSPC-PA 2
The author, Bill Corbett, has replied via email. Spot measurements are obtained in each direction up to the maximum surface area coated during the work shift until two consecutive conforming spot measurements are acquired in that direction, or until no additional measurements can be made.
Contained 6 appendices Contains 8 appendices.